Al-Si-Fe-Mg series high thermal conductivity aluminum alloy and preparation method and heat dissipation structure thereof

Abstract

The present invention provides an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, comprising 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, and 0.0001-0.1% RE by mass. The present invention also provides a preparation method and a heat dissipation structure of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy.

Description

[0001] This invention is a divisional application, the original application number is 202410168688.8, the application date is February 5, 2024, and the name is Al-Si-Fe-Mg series high thermal conductivity aluminum alloy and its preparation method and heat dissipation structure. Technical Field

[0002] The present invention relates to the technical field of aluminum alloys, and in particular to an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, a preparation method of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, and a heat dissipation structure. Background Art

[0003] Aluminum alloys, with their low melting point, low cost, easy recycling, excellent thermal conductivity, and suitability for die-casting, are widely used in the manufacture of structural components for products such as mobile phones. To improve the mechanical properties of these components, alloying elements must be added, but the addition of these elements can reduce the thermal conductivity of aluminum alloys. Therefore, finding a balance between the mechanical and thermal properties of aluminum alloys to produce aluminum alloys with excellent mechanical, thermal, and die-casting properties is a pressing technical challenge facing those skilled in the field of high-thermal-conductivity aluminum alloys. Summary of the Invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, aiming to obtain an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy with excellent thermal conductivity, mechanical properties and die-casting forming performance.

[0005] The present invention provides an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, which contains aluminum, 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.11-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, and 0.0001-0.1% RE by mass, wherein Si, The sum of the mass percentages of Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, and the sum of the mass percentages of Cu, Mg, and Zn is 0.052-0.5%. The Al-Si-Fe-Mg high thermal conductivity aluminum alloy is subjected to die casting and aging treatment, and the aging treatment includes a primary low-temperature aging treatment, a secondary low-temperature aging treatment, and a tertiary high-temperature aging treatment, wherein the temperature of the primary low-temperature aging treatment is -100°C to -200°C, and the time is 1h to 15h; the temperature of the secondary low-temperature aging treatment is 0°C to 70°C, and the time is 1h to 24h; the temperature of the tertiary high-temperature aging treatment is 280°C to 350°C, and the time is 0.05h to 15h.

[0006] The present invention also provides a method for preparing an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, comprising the following steps:

[0007] The aluminum source is subjected to a first heating treatment to obtain aluminum liquid;

[0008] adding Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni to the aluminum liquid and performing a second heating treatment to obtain an alloy liquid;

[0009] Refining and slagging the alloy liquid, and testing its composition and content; and

[0010] After the composition and content are tested to be qualified, the alloy liquid after the refining treatment and the slag removal treatment is subjected to die casting and aging treatment to obtain an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, wherein the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.11-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, and 0.1% by mass of Mg by mass. The present invention relates to a method for preparing an aging treatment for a steel structure comprising: a first-stage low-temperature aging treatment, a second-stage low-temperature aging treatment, and a third-stage high-temperature aging treatment. The aging treatment comprises: a first-stage low-temperature aging treatment, a second-stage low-temperature aging treatment, and a third-stage high-temperature aging treatment. The first-stage low-temperature aging treatment is performed at a temperature of -100°C to -200°C, and a time of 1 hour to 15 hours. The second-stage low-temperature aging treatment is performed at a temperature of 0°C to 70°C, and a time of 1 hour to 24 hours. The third-stage high-temperature aging treatment is performed at a temperature of 280°C to 350°C, and a time of 0.05 hour to 15 hours.

[0011] The present invention also provides a heat dissipation structure, at least part of which is made of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy or the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy prepared by the preparation method of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy. DETAILED DESCRIPTION

[0012] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0013] One embodiment of the present invention provides an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, containing aluminum, and further containing 5-8% by mass of Si, 0.4-0.8% by mass of Fe, 0.001-0.05% by mass of Cu, 0.05-0.4% by mass of Mg, 0.005-0.04% by mass of Sr, 0.001-0.05% by mass of Zn, 0.001-0.05% by mass of Ni, 0-0.1% by mass of Co, 0-0.01% by mass of Be, and 0.0001-0.1% by mass of RE, wherein the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, and the sum of the mass percentages of Cu, Mg, and Zn is 0.052-0.5%.

[0014] In a preferred embodiment, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy contains 6-7.5% Si by mass, 0.5-0.7% Fe by mass, 0.005-0.04% Cu by mass, 0.1-0.3% Mg by mass, 0.01-0.03% Sr by mass, 0.002-0.01% Zn by mass, 0.001-0.009% Ni by mass, 0-0.05% Co by mass, and 0-0.005% Be by mass, wherein the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is 5.5-9%, and the sum of the mass percentages of Cu, Mg, and Zn is 0.18-0.3%.

[0015] The sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is no more than 9%, preferably no more than 8.5%, and more preferably no more than 8%. In this way, while ensuring the excellent mechanical properties and thermal conductivity of the aluminum alloy, it is avoided that the addition of too many elements leads to excessive solid solution in the aluminum matrix. In one embodiment, the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is 5.5-9%, preferably 6-8.5%, more preferably 6.5-7%, and specifically 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, or 9%. In one embodiment, the sum of the total content of elements other than Al in the aluminum alloy is 5.5-9%, preferably 6-8.5%, more preferably 6.5-7%, and specifically 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, or 9%.

[0016] The sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%, preferably 0.1-0.5%, more preferably not more than 0.2-0.3%, and again preferably 0.18-0.3%. Specifically, it can be 0.052%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.12%, 0.14%, 0.16%, 0.18%, 0.2%, 0.22%, 0.24%, 0.26%, 0.28%, 0.3%, 0.32%, 0.34%, 0.36%, 0.38%, 0.4%, 0.42%, 0.44%, 0.46%, 0.48%, or 0.5%.

[0017] The sum of the mass percentage contents of Cu, Mg, Zn, and Ni is 0.057-0.55%, preferably 0.1-0.5%, more preferably 0.2-0.4%, and specifically 0.057%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.12%, 0.14%, 0.16%, 0.18%, 0.2%, 0.22%, 0.24%, 0.26%, 0.28%, 0.3%, 0.32%, 0.34%, 0.36%, 0.38%, 0.4%, 0.52%, 0.54%, or 0.55%.

[0018] The mass percentage content of Si may be 5%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9%, 6%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9%, 7%, 7.1%, 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, 7.8%, 7.9%, or 8%.

[0019] The mass percentage content of Fe may be 0.4%, 0.41%, 0.42%, 0.43%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, 0.49%, 0.5%, 0.51%, 0.52%, 0.53%, 0.54%, 0.55%, 0.56%, 0.57%, 0.58%, 0.59%, 0.6%, 0.61%, 0.62%, 0.63%, 0.64%, 0.65%, 0.66%, 0.67%, 0.68%, 0.69%, 0.7%, 0.71%, 0.72%, 0.73%, 0.74%, 0.75%, 0.76%, 0.77%, 0.78%, 0.79%, or 0.8%.

[0020] The mass percentage content of Cu can be 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.01%, 0.011%, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, 0.02%, 0.021%, 0.022%, 0.023%, 0.024%, 0.0 0.025%, 0.026%, 0.027%, 0.028%, 0.029%, 0.03%, 0.031%, 0.032%, 0.033%, 0.034%, 0.035%, 0.036%, 0.037%, 0.038%, 0.039%, 0.04%, 0.041%, 0.042%, 0.043%, 0.044%, 0.045%, 0.046%, 0.047%, 0.048%, 0.049%, or 0.05%.

[0021] The mass percentage content of Mg is 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19%, 0.2%, 0.21%, 0.22%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.3%, 0.31%, 0.32%, 0.33%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38%, 0.39% or 0.4%.

[0022] The mass percentage content of Sr may be 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.01%, 0.011%, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, 0.02%, 0.021%, 0.022%, 0.023%, 0.024%, 0.025%, 0.026%, 0.027%, 0.028%, 0.029%, 0.03%, 0.031%, 0.032%, 0.033%, 0.034%, 0.035%, 0.036%, 0.037%, 0.038%, 0.039%, or 0.04%.

[0023] The mass percentage content of Zn can be 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.01%, 0.011%, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, 0.02%, 0.021%, 0.022%, 0.023%, 0.024%, 0.0 0.025%, 0.026%, 0.027%, 0.028%, 0.029%, 0.03%, 0.031%, 0.032%, 0.033%, 0.034%, 0.035%, 0.036%, 0.037%, 0.038%, 0.039%, 0.04%, 0.041%, 0.042%, 0.043%, 0.044%, 0.045%, 0.046%, 0.047%, 0.048%, 0.049%, or 0.05%.

[0024] The mass percentage content of Ni may be 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.01%, 0.012%, 0.014%, 0.016%, 0.018%, 0.02%, 0.022%, 0.024%, 0.026%, 0.028%, 0.03%, 0.032%, 0.034%, 0.036%, 0.038%, 0.04%, 0.042%, 0.044%, 0.046%, 0.048%, or 0.05%.

[0025] The mass percentage content of Be may be 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, or 0.01%.

[0026] The mass percentage content of Co may be 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%.

[0027] The mass percentage content of RE may be 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, 0.01%, 0.011%, 0.012%, 0.013%, 0.014%, 0.015%, 0.016%, 0.017%, 0.018%, 0.019%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%.

[0028] RE is at least one of La, Ce, Pr, Nd, Er, Sm, Y, and Gd.

[0029] The mass ratio of Mg to Cu is 1-50:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties of the aluminum alloy gradually increase. The mass ratio of Mg to Cu is preferably 5-40:1, more preferably 10-30:1, and even more preferably 15-20:1. Specifically, the mass ratio can be 1:1, 2:1, 4:1, 6:1, 7:1, 10:1, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, or 50:1.

[0030] The mass ratio of Mg, Cu, and Zn is 5-500:0.1-20:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties of the aluminum alloy gradually increase. The mass ratio of Mg, Cu, and Zn is preferably 10-400:0.5-15:1, more preferably 10-200:1-10:1, and further preferably 20-50:2-5:1. Specifically, it can be 5:0.1:1, 5:1:1, 5:5:1, 5:10:1, 5:20:1, 10:0.1:1, 10:1:1, 10:5:1, 10:10:1, 1 0:20:1, 100:0.1:1, 100:1:1, 100:5:1, 100:10:1, 100:20:1, 200:0.1:1, 200:1:1, 200:5:1, 200:10:1, 200:20:1, 500:0.1:1, 500:1:1, 500:5:1, 500:10:1, or 500:20:1.

[0031] The mass ratio of Si to Fe is 5-20:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Si to Fe is preferably 10-20:1, more preferably 15-20:1, and specifically 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, or 20:1.

[0032] The mass ratio of Si to Sr is 200-1500:1. Within this mass ratio range, as the mass ratio decreases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Si to Sr is preferably 500-1000:1, more preferably 700-800:1, and specifically can be 200:1, 250:1, 300:1, 350:1, 400:1, 450:1, 500:1, 550:1, 600:1, 650:1, 700:1, 750:1, 800:1, 850:1, 900:1, 950:1, 1000:1, 1100:1, 1200:1, 1300:1, 1400:1, or 1500:1.

[0033] The mass ratio of Be, Co, and Fe is 0.001-0.03:0.004-0.25:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Be, Co, and Fe is preferably 0.005-0.02:0.005-0.2:1, more preferably 0.01-0.015:0.01-0.05:1, specifically 0.001:0.004:1, 0.001:0.01:1, 0.001:0.05:1, 0.001:0.1:1, 0.001:0.2:1, 0.001:0.25:1, 0.005:0.004:1, 0.005:0.01:1, 0.005:0.05:1, 0.005:0.1:1, 0.005:0.2:1, 0.005:0 .25:1, 0.01:0.004:1, 0.01:0.01:1, 0.01:0.05:1, 0.01:0.1:1, 0.01:0.2:1, 0.01:0.25:1, 0.02:0.004:1, 0.02:0.01:1, 0.02:0.05:1, 0.02:0.1:1, 0.02:0.2:1, 0.02:0.25:1, 0.03:0.004:1, 0.03:0.01:1, 0.03:0.05:1, 0.03:0.1:1, 0.03:0.2:1, or 0.03:0.25:1.

[0034] The mass ratio of Co, Ni, and Be is 0.1-100:0.4-50:1. Within the range of this mass ratio, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Co, Ni, and Be is preferably 1-50:1-30:1, more preferably 5-20:1-15:1, and specifically can be 0.1:0.4:1, 0.1:1:1, 0.1:5:1, 0.1:10:1, 0.1:20:1, 0.1:30:1, 0.1:40:1, 0.1:50:1, 1:0.4:1, 1:1:1, 1:5:1, 1:10:1, 1:20:1, 1:30:1, 1:40:1, 1:50:1, 10:0.4:1, 10 :1:1, 10:5:1, 10:10:1, 10:20:1, 10:30:1, 10:40:1, 10:50:1, 50:0.4:1, 50:1:1, 50:5:1, 50:10:1, 50:20:1, 50:30:1, 50:40:1, 50:50:1, 100:0.4:1, 100:1:1, 100:5:1, 100:10:1, 100:20:1, 100:30:1, 100:40:1, or 100:50:1.

[0035] The mass ratio of Fe to Co is 1-250:1. Within this mass ratio range, as the mass ratio increases, the thermal conductivity of the aluminum alloy gradually increases. The mass ratio of Fe to Co is preferably 10-80:1, more preferably 30-50:1, and specifically can be 1:1, 5:1, 10:1, 15:1, 20:1, 25:1, 30:1, 35:1, 40:1, 45:1, 50:1, 55:1, 60:1, 65:1, 70:1, 75:1, 80:1, 85:1, 90:1, 95:1, 100:1, 110:1, 120:1, 130:1, 140:1, 150:1, 160:1, 170:1, 180:1, 190:1, 200:1, 210:1, 220:1, 230:1, 240:1, or 250:1.

[0036] The Al-Si-Fe-Mg high thermal conductivity aluminum alloy has a single impurity content of less than 0.02% by weight, and the total impurity content is less than 0.1% by weight. Mn, Ti, Cr, and V may be included as impurities, and their total content by weight is no greater than 0.03%, preferably no greater than 0.025%, and more preferably no greater than 0.02%.

[0037] The mass percentage content of Mn may be 0-0.009%, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, or 0.009%.

[0038] The mass percentage content of Ti, Cr and V can be 0-0.008%, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, or 0.008%.

[0039] In one embodiment, the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 6-7.5% Si by mass, 0.5-0.7% Fe by mass, 0.005-0.04% Cu by mass, 0.1-0.3% Mg by mass, 0.01-0.03% Sr by mass, 0.002-0.01% Zn by mass, 0.001-0.01% Ni by mass, 0.005-0.05% Co by mass, and 0.00 1-0.005% Be, 0.0005-0.05% RE, 0.001-0.009% Mn, 0.001-0.008% Ti, 0.001-0.008% Cr, and 0.001-0.008% V by mass, wherein the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is 5.5-9%, and the sum of the mass percentages of Cu, Mg, and Zn is 0.18-0.3%.

[0040] In the technical solution of the present invention, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, and 0.0001-0.1% RE by mass, wherein the sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, and the sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%. The Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE and Ni within the above content range interact with each other as a whole, ensuring that the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy has good formability while also having excellent mechanical properties and thermal conductivity. The details are as follows:

[0041] (1) When the mass percentage of Si is 5-8%, on the one hand, Si can improve the fluidity and density of aluminum alloy, thereby improving the forming performance and mechanical properties of aluminum alloy. On the other hand, Si can react with other elements as much as possible to form a second phase to avoid the adverse effect of Si dissolved in the aluminum matrix on the thermal conductivity of aluminum alloy. Specifically, Si can react with Al, Fe, Cu, Mg, Mn, etc. to form Mg2Si, AlFeSi, AlMnSi, AlFeSiCu, AlFeMgSi, AlFeMnSi and other second phases;

[0042] (2) When the mass percentage of Fe is 0.4-0.8%, on the one hand, Fe can reduce the tendency of aluminum alloy castings to stick to the mold and improve the mechanical properties and thermal conductivity of the aluminum alloy. On the other hand, Fe can react with other elements as much as possible to form a second phase to avoid the adverse effect of Fe dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Fe can react with Al, Si, Mg, Cu, Mn, Ni, etc. to form Al3Fe, AlFeSi, AlFeMgSi, AlFeSiCu, AlFeSiNi, AlFeMgSiNi, AlFeMnSi, FeNiAl9 and other second phases;

[0043] (3) When the mass percentage of Cu is 0.001-0.05%, on the one hand, Cu can improve the mechanical properties, thermal conductivity, and fatigue resistance of aluminum alloys. On the other hand, Cu can react with other elements to form a second phase as much as possible to avoid the adverse effect of Cu dissolved in the aluminum matrix on the thermal conductivity of aluminum alloys. Specifically, Cu can react with Al, Fe, Si, Mg, Zn, etc. to form CuAl2, AlFeSiCu, Al2CuZn, (CuMg)Al2 and other second phases. In addition, Cu can also promote the precipitation of Mg2Si, Mg2Zn, Mg2SiZn, (CuMg)Al2, AlFeMgSi, AlFeMgSiNi and other second phases, increase their volume fraction and dispersion, and reduce the solid solubility of the above elements in the aluminum matrix.

[0044] (4) When the mass percentage of Mg is 0.05-0.4%, on the one hand, Mg can improve the mechanical properties and thermal conductivity of aluminum alloys. On the other hand, Mg can react with other elements to form a second phase as much as possible to avoid the adverse effect of Mg dissolved in the aluminum matrix on the thermal conductivity of aluminum alloys. Specifically, Mg can react with Al, Fe, Si, Cu, Zn, Ni, etc. to form Mg2Si, Mg2Zn, Mg2SiZn, (CuMg)Al2, AlFeMgSi, AlFeMgSiNi and other second phases. Mg can also promote the precipitation of CuAl2, AlFeSiCu, Al2CuZn, (CuMg)Al2 and other second phases, increase their volume fraction and dispersion, and reduce the solid solubility of the above elements in the aluminum matrix.

[0045] (5) When the mass percentage of Sr is 0.005-0.04%, on the one hand, Sr can be modified through the heterogeneous nucleation theory or twin valley mechanism to refine the second phase such as eutectic silicon, improve the thermal conductivity and mechanical properties of the aluminum alloy, and also transform the β-AlFeSi phase in the ingot into the Chinese character α-AlFeSi phase to improve the mechanical properties of the aluminum alloy. On the other hand, Sr can preferentially combine with elements such as Fe, Cu, Mn, Cr, and Si to form dispersion strengthening to avoid the adverse effect of Sr dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. In addition, Sr can also promote the precipitation of phases such as CuAl2 and Mg2Si to reduce the solid solubility of these alloying elements in the aluminum matrix.

[0046] (6) When the mass percentage of Zn is 0.001-0.05%, on the one hand, Zn can improve the mechanical properties of aluminum alloys, and on the other hand, Zn can react with other elements to form a second phase as much as possible to avoid the adverse effect of Zn dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Zn can react with Al, Mg, Cu and Si to form second phases such as MgZn2, Mg2SiZn, Al2CuZn, etc. Zn can eliminate elemental Si to reduce the adverse effect of elemental Si on the performance of aluminum alloys. Zn can also promote the precipitation of phases such as Mg2Si and Al2Cu, thereby improving mechanical properties and thermal conductivity.

[0047] (7) When the mass percentage of Ni is 0.001-0.05%, on the one hand, Ni can be used to improve the mechanical properties and thermal conductivity of aluminum alloys. On the other hand, Ni can react with other elements to form a second phase as much as possible to avoid the adverse effect of Ni dissolved in the aluminum matrix on the thermal conductivity of aluminum alloys. Specifically, Ni can react with Al, Fe, Mg, Si, etc. to form Al3Ni, AlFeSiNi, AlFeMgSiNi, FeNiAl9 and other second phases, promoting the precipitation of elements such as Cu, Mg, Zn, Si, Fe dissolved in the alloy; Ni can also refine grains, promote the precipitation of strengthening phases such as CuAl2, (CuMg)Al2, Mg2Si, increase the volume fraction and dispersion of the precipitated phase, and reduce the solid solubility of alloy elements in the aluminum matrix. In addition, Ni and Cu, Mg can promote each other's precipitation to improve the thermal conductivity and mechanical properties of aluminum alloys.

[0048] (8) When the mass percentage of Co is not greater than 0.1%, Co can refine the grains to improve the thermal conductivity and mechanical properties of the aluminum alloy. On the other hand, it can also react with other elements to form a second phase as much as possible to avoid the adverse effect of Be dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, Co can react with Al, Fe, Si, etc. to form Al 15 (Fe, Co) 3 Si 2, Al 3 (Fe, Co) and other second phases. In addition, Co has a refining effect on the Al 3 Fe phase, which can transform the coarse needle-shaped and flake-shaped β-Al 3 Fe phase into small flower-shaped and fine strip-shaped α-Al 15 (Fe,Co)3Si2 phase can also promote the α-Al 15 The precipitation of (Fe, Co) 3 Si 2 phase further improves the mechanical properties and thermal conductivity of the aluminum alloy. The composite addition of Ni and Co can effectively modify Fe and transform the free Fe into the second phase. The composite addition of Co, Ni and Be can quickly reduce the solid solubility of each other in the alloy and increase the volume fraction of the second phase, thereby improving the mechanical properties and thermal conductivity of the aluminum alloy.

[0049] (9) When the mass percentage of Be is not more than 0.01%, Be can transform the eutectic Si phase from a lamellar phase to a fine phase to refine the Si phase, thereby reducing or eliminating the adverse effects of Si on the aluminum alloy. Be can also transform the plate-like β intermediate phase into a relatively harmless Chinese character-shaped Be-Fe (Al8Fe2SiBe) phase to reduce or eliminate the adverse effects of Fe on the properties of the aluminum alloy. It can also reduce the formation of Mg-containing Fe-rich phases, thereby increasing the Mg content in the aging process. On the other hand, Be can also combine with vacancies to prevent the migration and disappearance of vacancies. The addition of Be significantly increases the nucleation rate of the metastable phase, improves the strengthening effect of aging, and reduces the solid solubility of the above elements in the aluminum matrix. Ni and Be are combined, which greatly promotes the precipitation of the second phase and reduces the solid solubility of the alloying elements in the matrix.

[0050] (10) When the mass percentage of RE is 0.0001-0.1%, RE can form a rare earth active film on the surface of the Fe-containing phase or combine with Al, Fe, Ti and other atoms to form rare earth compounds to effectively reduce the solid solution of harmful elements in the aluminum matrix. It can also transform the long strip β-Fe phase into the spherical α-Fe phase and transform the elemental Si. On the other hand, RE can also promote the precipitation of dispersed phases such as CuAl2, (CuMg)Al2, Mg2Si, etc., and improve the mechanical properties of aluminum alloys. In addition, RE can also refine the grains, second phases and precipitated phases (for example, it can refine Al3RE, Al3Fe, Mg2Si phases, etc.), further improving the mechanical properties and thermal conductivity of aluminum alloys.

[0051] When the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni within the above content range is not more than 9% and the sum of the mass percentages of Cu, Mg, and Zn is 0.052-0.5%, Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni interact with each other as a whole, thereby removing the contents of transition elements Ti, Mn, Cr, and V in the aluminum matrix that have a great influence on thermal conductivity, refining the grains, reducing the solid solubility of the alloying elements in the aluminum matrix, and increasing the volume fraction of the precipitated phase, thereby reducing the adverse effects of the alloying elements on the thermal conductivity of the aluminum alloy and improving the comprehensive properties of the aluminum alloy (including mechanical properties, thermal conductivity, and forming properties, etc.). At the same time, under the further action of aging treatment, the solid solubility of each element in the aluminum matrix is ​​further reduced, which can eliminate the adverse effects of alloying elements on the thermal conductivity of aluminum alloy as much as possible, and the second phase (such as Al3Fe, Mg2Si, Al2Cu, AlFeSiNi, AlMnSi phases, etc.) can also be refined in the aluminum matrix and at the grain boundaries or within the grain boundaries, greatly improving the mechanical properties and thermal conductivity of the aluminum alloy.

[0052] Specifically, since transition elements such as Mn, Cr, Ti, and V have a great influence on the thermal conductivity and mechanical properties of aluminum alloys, their content needs to be strictly controlled; when elements such as Cu, Mg, and Zn are added in large amounts, the thermal conductivity and mechanical properties of the aluminum alloy will also be reduced, and their content also needs to be controlled; but when the mass percentage content of at least one of Cu, Mg, Sr, Zn, Co, Be, RE, Ni, Mn, Cr, Ti, and V is low, the elements with low mass percentage content are not easy to precipitate, and will exist in the aluminum matrix in the form of solid solution, thereby reducing the thermal conductivity and mechanical properties of the aluminum alloy, and the refinement and metamorphism of the aluminum alloy will also deteriorate, causing the elemental Si at the grain boundaries of the aluminum alloy to exist in the form of coarse flakes and strips, seriously splitting the aluminum matrix, and further reducing the thermal conductivity and mechanical properties of the aluminum alloy. In the present invention, as described in items (1) to (10) above, Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni within the above content range interact with each other as a whole to refine the grains (such as the modification effect of Sr, the grain refining effect of Ni, Co, Be, and RE), reduce each other's solid solubility in the aluminum matrix (such as the elements can react with each other to form a second phase), and increase the volume fraction of the precipitated phase (such as Cu, Mg, Sr, Zn, Co, Be, RE, and Ni can promote the precipitation of the second phase), thereby improving the mechanical properties and thermal conductivity of the aluminum alloy; even if the mass percentage content of one or some elements is low, during the aging treatment, all or almost all of the elements can be precipitated, avoiding adverse effects on the thermal conductivity of the aluminum alloy.

[0053] It can be understood that since the addition of alloying elements will reduce the thermal conductivity of aluminum alloys, the amount of at least one element added among Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni in the present invention may be less than the amount of the element added in the prior art. The sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, and the sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%. Among them, the amount of all elements added among Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni in the present invention may be less than the amount of the elements added in the prior art. Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni within the above-mentioned content range interact with each other as a whole. On the one hand, it can avoid the reduction of thermal conductivity of aluminum alloy by adding too many elements. On the other hand, when at least one of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is added in a small amount, it can still improve the comprehensive properties of aluminum alloy (including mechanical properties and thermal conductivity, etc.).

[0054] The Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains 0-0.009% In by mass, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, or 0.009%.

[0055] The sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, In, and Ni is no more than 9%, preferably no more than 8.6%, and more preferably no more than 8.1%. This arrangement ensures that the mechanical properties and thermal conductivity of the aluminum alloy are excellent while avoiding excessive solid solution of excessive elements in the aluminum matrix. In one embodiment, the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, In, and Ni is 5.5-9%, preferably 6-8.6%, more preferably 6.5-7.05%, and specifically 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, or 9%.

[0056] The mass ratio of Cu to In is 0.2-40:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties of the aluminum alloy gradually increase. The mass ratio of Cu to In is preferably 1-20:1, more preferably 5-10:1, and specifically can be 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1, 25:1, 30:1, 35:1, or 40:1.

[0057] In the technical solution of the present invention, the Al-Si-Fe-Mg high-thermal-conductivity aluminum alloy further contains 0-0.009% by weight of In. In improves the mechanical properties of the aluminum alloy and reacts with other elements to form secondary phases as much as possible, thereby preventing the adverse effects of Si dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, In reacts with Al and Cu to form secondary phases such as AlIn and CuIn. In also refines the grain size, thereby improving the elongation of the aluminum alloy.

[0058] The Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains Nb in an amount of 0-0.005% by mass, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, or 0.005%.

[0059] The mass ratio of Ni to Nb is 0.1-10:1. Within this range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Ni to Nb is preferably 0.5-5:1, more preferably 1-3:1, and specifically can be 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, or 10:1.

[0060] In the technical solution of the present invention, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains 0-0.005% by weight of Nb. Nb improves the mechanical properties and thermal conductivity of the aluminum alloy. Furthermore, Nb reacts with other elements to form a secondary phase as much as possible, thereby preventing Nb dissolved in the aluminum matrix from adversely affecting the thermal conductivity of the aluminum alloy. Specifically, Nb reacts with Ti and Al to form a TiAl-Nb phase. Furthermore, Nb refines the grain size, thereby improving the elongation of the aluminum alloy.

[0061] The Al-Si-Fe-Mg high thermal conductivity aluminum alloy also contains Bi in a mass percentage content of 0-0.01%, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, or 0.01%.

[0062] The mass ratio of Mg to Bi is 5-400:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties of the aluminum alloy gradually increase. The mass ratio of Mg to Bi is preferably 50-300:1, more preferably 100-200:1, and even more preferably 150-200:1. Specifically, it can be 5:1, 10:1, 50:1, 100:1, 150:1, 200:1, 250:1, 300:1, 350:1, or 400:1.

[0063] In the technical solution of the present invention, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy also contains Bi in a mass percentage content of 0-0.01%. On the one hand, Bi can improve the mechanical properties of the aluminum alloy. On the other hand, Bi can react with other elements as much as possible to form a second phase to avoid the adverse effect of Bi dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, Bi can react with Mg and Cd to form second phases such as Mg3Bi2 and Mg3(BiCd)2.

[0064] The Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains Ge in a mass percentage content of 0-0.005%, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, or 0.005%.

[0065] The sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, In, Ge, Bi, and Ni is no more than 9.01%, preferably no more than 8.6%, and more preferably no more than 8.1%. In this way, while ensuring the excellent mechanical properties and thermal conductivity of the aluminum alloy, it is avoided that the addition of too many elements leads to excessive solid solution in the aluminum matrix. In one embodiment, the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, In, Ge, Bi, and Ni is 5.5-9%, preferably 6-8.6%, more preferably 6.5-7%, and specifically 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, or 9%.

[0066] The mass ratio of Si to Ge is 1000-2000:1. Within this mass ratio range, as the mass ratio decreases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Si to Ge is preferably 1000-1500:1, more preferably 1300-1500:1, and specifically can be 1000:1, 1100:1, 1200:1, 1300:1, 1400:1, 1500:1, 1600:1, 1700:1, 1800:1, 1900:1, and 2000:1.

[0067] In the technical solution of the present invention, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains Ge in an amount of 0-0.005% by mass. Ge can improve the mechanical properties and thermal conductivity of the aluminum alloy. Furthermore, Ge can react with other elements as much as possible to form secondary phases, thereby preventing the adverse effects of Ge dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, Ge can react with Al and Si to form secondary phases such as Al9Ge7, Al6Ge5, Al5Ge2, Al3Ge4, and SiGe. Furthermore, Ge can promote the precipitation of secondary phases such as Mg2Si and CuAl2, refine the precipitated phases, and reduce the solubility of the aforementioned elements in the aluminum matrix. Ge can also replace some Si atoms in the metastable precipitated phase. The Si-Ge phase precipitated at the initial stage of aging provides a nucleation site for the θ phase, increasing the density of the θ phase, thereby further improving the mechanical properties and thermal conductivity of the aluminum alloy.

[0068] The Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains Mo in a mass percentage content of 0-0.005%, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, or 0.005%.

[0069] The mass ratio of Si to Mo is 1500-2000:1. Within this mass ratio range, as the mass ratio decreases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Si to Mo is preferably 1500-1800:1, more preferably 1500-1600:1, and specifically can be 1500:1, 1600:1, 1700:1, 1800:1, 1900:1, or 2000:1.

[0070] In the technical solution of the present invention, the Al-Si-Fe-Mg high-thermal-conductivity aluminum alloy further contains 0-0.005% by mass of Mo. Mo improves the mechanical properties and thermal conductivity of the aluminum alloy. Furthermore, Mo reacts with other elements to form secondary phases, minimizing the negative impact of Ge dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, Mo reacts with Al, Si, Fe, and other elements to form secondary phases such as AlMo, AlSiMo, and AlSiFeMo, which are dispersed at the grain boundaries of the aluminum matrix. Furthermore, Mo refines grain size and improves the morphology of Fe-containing intermetallic compounds, further enhancing the mechanical properties of the aluminum alloy.

[0071] The Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains 0-0.005% by mass of Ag, specifically 0.0001%, 0.0005%, 0.001%, 0.002%, 0.003%, 0.004%, or 0.005%.

[0072] The mass ratio of Mg to Ag is 10-1000:1. Within this range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Mg to Ag is preferably 50-800:1, more preferably 200-500:1, and even more preferably 400-500:1. Specifically, it can be 10:1, 50:1, 100:1, 150:1, 200:1, 250:1, 300:1, 350:1, 400:1, 450:1, 500:1, 550:1, 600:1, 650:1, 700:1, 750:1, 800:1, 850:1, 900:1, 950:1, or 1000:1.

[0073] The mass ratio of Cu to Ag is 1-500:1. Within this mass ratio range, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase with increasing mass ratio. The mass ratio of Cu to Ag is preferably 5-300:1, more preferably 10-150:1, and even more preferably 20-50:1. Specifically, it can be 1:1, 5:1, 10:1, 50:1, 100:1, 150:1, 200:1, 250:1, 300:1, 350:1, 400:1, 450:1, or 500:1.

[0074] In the technical solution of the present invention, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy also contains Ag with a mass percentage of 0-0.005%. Ag can promote the precipitation of the second phase (such as Al2Cu, Mg2Si, Mg3Sn2, and Mg3Bi2, etc.), refine the precipitated phase and increase the density of the precipitated phase, thereby improving the precipitation strengthening effect of the aluminum alloy, thereby improving the mechanical properties and thermal conductivity of the aluminum alloy.

[0075] The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Sn in an amount of 0-0.15% by mass and Te in an amount of 0-0.005% by mass.

[0076] The mass ratio of Mg to Sn is 0.5-15:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Mg to Sn is preferably 1-8:1, more preferably 3-8:1, and even more preferably 5-8:1. Specifically, it can be 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, or 15:1.

[0077] The mass ratio of Te to Sn is 0.01-1:1. Within this range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of Te to Sn is preferably 0.05-1:1, more preferably 0.1-8:1, and even more preferably 1-5:1. Specifically, it can be 0.01:1, 0.02:1, 0.04:1, 0.06:1, 0.08:1, 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, or 1:1.

[0078] In the technical solution of the present invention, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy further contains Sn in an amount of 0-0.15% by mass and Te in an amount of 0-0.005% by mass. Te can improve the mechanical properties and thermal conductivity of the aluminum alloy. Te can narrow the solidification temperature range of the aluminum alloy, forming small, petal-shaped rather than dendritic primary crystals, reducing or eliminating microshrinkage, thereby improving the mechanical properties and thermal conductivity of the aluminum alloy. Sn can improve the thermal conductivity of the aluminum alloy and can also react with other elements to form a secondary phase as much as possible to avoid the adverse effects of Ge dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, Sn can react with Al to form various high-temperature strengthening phases such as Al9Sn7, Al6Sn5, Al5Sn2, and Al3Sn4.

[0079] The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Cd in an amount of 0-0.01% by mass.

[0080] The mass percentage content of Cd may be 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, or 0.01%.

[0081] The mass ratio of RE, Sr, and Fe is 0.002-0.1:0.02-0.08:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually increase. The mass ratio of RE, Sr, and Fe is preferably 0.005-0.05:0.04-0.06:1, more preferably 0.01-0.03:0.05-0.06:1, specifically 0.002:0.02:1, 0.002:0.04:1, 0.002:0.06:1, 0.002:0.08:1, 0.005:0.02:1, 0.005:0.04:1, 0.005:0.0 6:1, 0.005:0.08:1, 0.01:0.02:1, 0.01:0.04:1, 0.01:0.06:1, 0.01:0.08:1, 0.05:0.02:1, 0.05:0.04:1, 0.05:0.06:1, 0.05:0.08:1, 0.1:0.02:1, 0.1:0.04:1, 0.1:0.06:1, or 0.1:0.08:1.

[0082] The mass ratio of RE to Cd is 0.1-25:1. Within this mass ratio range, as the mass ratio increases, the mechanical properties and thermal conductivity of the aluminum alloy gradually improve. The mass ratio of RE to Cd is preferably 1-20:1, more preferably 5-20:1, and even more preferably 10-15:1. Specifically, it can be 0.1:1, 0.5:1, 1:1, 5:1, 10:1, 15:1, 20:1, or 25:1.

[0083] In the technical solution of the present invention, the Al-Si-Fe-Mg high thermal conductivity aluminum alloy also contains 0-0.01% by weight of Cd. Cd refines α-Al and can form strengthening phases such as REAl2Cd3, Al3Cd, Al2Cd3, (CuCd)Al2, Mg2(SiCdREFe), and Mg3(BiCd)2 with Al, RE, Cu, Mg, Si, Fe, and Bi, thereby reducing the solid solubility of each other in the aluminum matrix and increasing the volume fraction of the precipitated phase. During the aging stage, Cd forms a large number of Cd-vacancy clusters, promoting and accelerating the precipitation of the CuAl2 phase, thereby reducing the solid solubility of the above-mentioned elements in the aluminum matrix.

[0084] In one embodiment, the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0.001-0.1% Co by mass, 0.001-0.01% Be by mass, 0.0001-0.009% In by mass, 0.0001-0.005% Nb by mass, 0.0001-0.006% Bi by mass, and 0. 0.0001-0.005% Ge, 0.0001-0.005% Mo, 0.0001-0.005% Ag, 0.0001-0.1% Sn, 0.0001-0.005% Te, 0.001-0.01% Cd, and 0.001-0.0 5% RE, wherein the sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, the sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%, the mass ratio of Be, Co, and Fe is 0.001-0.03:0.004-0.25:1, and the mass ratio of Co, Ni, and Be is 0.1-100:0.4-50:1.

[0085] In another embodiment, the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, and 0.001-0.05% Ni by mass. , Co with a mass percentage of 0.001-0.1%, Be with a mass percentage of 0.001-0.01%, Mn with a mass percentage of 0.001-0.009%, Ti with a mass percentage of 0.001-0.008%, Cr with a mass percentage of 0.001-0.008%, V with a mass percentage of 0.0001-0.009%, In with a mass percentage of 0.00 0.01-0.005% Nb, 0.0001-0.006% Bi, 0.0001-0.005% Ge, 0.0001-0.005% Mo, 0.0001-0.005% Ag, 0.0001-0.1% Sn, 0.0001-0.005% Te, 0.001-0.0 1% Cd and 0.001-0.05% RE by mass, wherein the sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, the sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%, the mass ratio of Be, Co, and Fe is 0.001-0.03:0.004-0.25:1, and the mass ratio of Co, Ni, and Be is 0.1-100:0.4-50:1.

[0086] In another embodiment, the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 6-7.5% Si by mass, 0.5-0.7% Fe by mass, 0.005-0.04% Cu by mass, 0.1-0.3% Mg by mass, 0.01-0.03% Sr by mass, 0.002-0.01% Zn by mass, and 0.001-0.009% Cu by mass. Ni, Co with a mass percentage of 0.005-0.05%, Be with a mass percentage of 0.005-0.05%, Mn with a mass percentage of 0.001-0.009%, Ti with a mass percentage of 0.001-0.008%, Cr with a mass percentage of 0.001-0.008%, V with a mass percentage of 0.0001-0.009%, In with a mass percentage of 0.0001-0.009%, The content of Nb is 0.0001-0.005% by mass, Bi is 0.0001-0.006% by mass, Ge is 0.0001-0.005% by mass, Mo is 0.0001-0.005% by mass, Ag is 0.0001-0.005% by mass, Sn is 0.0001-0.1% by mass, Te is 0.0001-0.005% by mass, and the content of Mo is 0.0001-0.005% by mass. The present invention relates to a novel nanostructured carbon steel comprising: a ...

[0087] The present invention also provides a method for preparing an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, comprising the following steps:

[0088] The aluminum source is heated at a temperature of 720-780°C to obtain aluminum liquid, wherein the aluminum liquid may contain Mn, Cr, Ti, and V;

[0089] Adding Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni to the aluminum liquid, performing a second heating treatment at 700-750° C. for 10-30 minutes to obtain an alloy liquid;

[0090] After refining, degassing, and slagging the alloy liquid, the composition and content are tested; and

[0091] After the composition and content are tested to be qualified, the alloy liquid is subjected to die casting treatment and aging treatment to obtain Al-Si-Fe-Mg series high thermal conductivity aluminum alloy. The Al-Si-Fe-Mg high thermal conductivity aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, and 0.0001-0.1% RE by mass, wherein the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, and the sum of the mass percentages of Cu, Mg, and Zn is 0.052-0.5%.

[0092] The aluminum source is at least one of primary aluminum, aluminum ingot, and recycled aluminum. The aluminum source generally contains impurities including Mn, Ti, Cr, or V.

[0093] Liquid aluminum produced by industrial aluminum electrolytic cells is purified, clarified, and deslagging before being cast into commercial aluminum ingots, typically with an aluminum content of no more than 99.8%. These ingots are alloys made from pure aluminum and recycled aluminum, with other elements such as Si, Cu, Mg, and Fe added according to international standards or specific requirements to improve the castability, chemical properties, and physical properties of pure aluminum. Recycled aluminum, also known as "secondary aluminum," is aluminum alloy or metal obtained by remelting and refining scrap aluminum, aluminum alloy scrap, or aluminum-containing waste. The primary raw materials for smelting recycled aluminum are industrial scrap (such as aircraft parts, engines, and casing covers) and scrap aluminum generated during aluminum processing (including plates, pipes, bars, profiles, scrap, and foil). It is understood that the aluminum source can also include sources other than primary aluminum, ingots, and recycled aluminum.

[0094] At least one of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni may be added in the form of an alloy or a single substance.

[0095] The method for preparing the Al-Si-Fe-Mg high thermal conductivity aluminum alloy further includes the step of adding at least one of In, Nb, Bi, Ge, Mo, Ag, Sn, Te, and Cd to the aluminum liquid. At least one of In, Nb, Bi, Ge, Mo, Ag, Sn, Te, and Cd may be added in the form of an alloy or a single element. The mass percentage content of In may be 0-0.009%. The mass percentage content of Nb may be 0-0.005%. The mass percentage content of Bi may be 0-0.01%. The mass percentage content of Ge may be 0-0.005%. The mass percentage content of Mo may be 0-0.005%. The mass percentage content of Ag may be 0-0.005%. The mass percentage content of Sn may be 0-0.15%. The mass percentage content of Te may be 0-0.005%. The mass percentage content of Cd may be 0-0.01%.

[0096] In one embodiment, the aging treatment is performed at a temperature of 280 to 350° C. and for a time of 0.05 to 15 hours. The temperature of the aging treatment may be 280° C., 285° C., 290° C., 295° C., 300° C., 305° C., 310° C., 315° C., 320° C., 325° C., 330° C., 335° C., 340° C., 345° C., or 350° C.; and the time of the aging treatment may be 0.05 h, 0.06 h, 0.07 h, 0.08 h, 0.09 h, 0.1 h, 0.2 h, 0.3 h, 0.4 h, 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h, 13 h, 14 h, or 15 h. During the aging treatment, the size of the precipitated phase gradually changes to smaller, and all or almost all of the alloying elements dissolved in the alloy are precipitated, which increases the pinning effect on dislocations and greatly improves the thermal conductivity and mechanical properties of the aluminum alloy.

[0097] In another embodiment, the aging treatment, which may also be referred to as a multi-stage aging treatment, includes a primary low-temperature aging treatment, a secondary low-temperature aging treatment, and a tertiary high-temperature aging treatment. The temperature of the primary low-temperature aging treatment is -100°C to -200°C, and the time is 1 to 15 hours; the temperature of the secondary low-temperature aging treatment is 0 to 70°C, and the time is 1 to 24 hours; the temperature of the tertiary high-temperature aging treatment is 280 to 350°C, and the time is 0.05 to 15 hours. The temperature of the primary low-temperature aging treatment may specifically be -200°C, -190°C, -180°C, -170°C, -160°C, -150°C, -140°C, -130°C, -120°C, -110°C, or -100°C. The time of the primary low-temperature aging treatment may specifically be 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, or 15 hours. The temperature of the secondary low-temperature aging treatment may specifically be 0°C, 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, or 70°C. The time of the secondary low-temperature aging treatment may specifically be 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours, 12 hours, 13 hours, 14 hours, 15 hours, 16 hours, 17 hours, 18 hours, 19 hours, 20 hours, 21 hours, 22 hours, 23 hours, or 24 hours. The temperature of the three-stage high-temperature aging treatment may specifically be 280° C., 285° C., 290° C., 295° C., 300° C., 305° C., 310° C., 315° C., 320° C., 325° C., 330° C., 335° C., 340° C., 345° C., or 350° C. The time of the three-stage high-temperature aging treatment may specifically be 0.05 h, 0.06 h, 0.07 h, 0.08 h, 0.09 h, 0.1 h, 0.2 h, 0.3 h, 0.4 h, 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, 1.5 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h, 13 h, 14 h, or 15 h.

[0098] During the primary low-temperature aging process, cryogenic treatment inhibits the segregation of atoms such as Mg, Cu, Ni, and Si, while also creating a greater undercooling degree in the alloy, significantly increasing the extent of the GP zone. This facilitates the nucleation rate during the subsequent high-temperature process and allows for more complete precipitation of alloying elements. Aluminum alloys also experience volume and lattice contraction during the low-temperature process, increasing the supersaturation of alloying elements and the precipitation of solute atoms, which in turn increases the content of alloying elements participating in aging. The reduced solubility of solute atoms leads to their segregation at dislocations, significantly enhancing the formation of GP zones. During the secondary low-temperature aging process, the segregated atoms, under the influence of internal stress and dislocations, diffuse uniformly within the aluminum matrix and at grain boundaries. During the tertiary high-temperature aging process, the GP zone gradually transforms into smaller precipitates with a larger volume fraction, extracting all or nearly all of the alloying elements dissolved within the alloy. This increases the pinning effect on dislocations and significantly improves the thermal conductivity and mechanical properties of the aluminum alloy.

[0099] The molten alloy is die-casted at a temperature of 660-700°C, with the die-casting machine operating at a speed of 0.23-2.5 m / s. It is understood that the die-casting process of the present invention is a conventional die-casting process, and vacuum die-casting can also be used to die-cast the molten alloy. The strength (e.g., yield strength and tensile strength) and elongation of the aluminum alloy after vacuum die-casting are higher than those of the aluminum alloy after conventional die-casting.

[0100] The refining process is performed at a temperature of 690-750°C for 10-20 minutes. The refining agent comprises the following raw materials in parts by weight: 60-70 parts KF, 50-60 parts NaCl, 40-60 parts LiCl, 20-25 parts cryolite, 10-25 parts AIF3, 10-15 parts CaF2, 5-10 parts light calcium carbonate, 15-20 parts graphite powder, 10-20 parts talc, 20-30 parts MgCl2, and 10-30 parts rare earth salt. The rare earth salt is a combination of one or more of a light rare earth chloride, fluoride, or nitric acid compound. The rare earth salt can be a combination of one or more of a heavy rare earth chloride, fluoride, or nitric acid compound. The mass ratio of the refining agent to the alloy solution is 0.0013-0.0018:1.

[0101] It is understandable that when the content of each component in the alloy liquid after degassing and slag removal treatment meets the standards, subsequent treatments such as die casting will be carried out. Among them, the qualified aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, 0.0001-0.1% RE by mass, and Al and unavoidable impurities, wherein the sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, and the sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%. If the test fails, the corresponding elements can be added to adjust until the composition and content are qualified.

[0102] In the technical solution of the present invention, the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy prepared by the preparation method of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.05-0.4% Mg by mass, 0.005-0.04% Sr by mass, and 0.00 1-0.05% Zn, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, and 0.0001-0.1% RE by mass, wherein the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is no more than 9%, and the sum of the mass percentages of Cu, Mg, and Zn is 0.052-0.5%. Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni within the above content range interact with each other as a whole, ensuring that the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy has better formability while also having excellent mechanical properties and thermal conductivity. The details are as follows:

[0103] (1) When the mass percentage of Si is 5-8%, on the one hand, Si can improve the fluidity and density of aluminum alloy, thereby improving the forming performance and mechanical properties of aluminum alloy. On the other hand, Si can react with other elements as much as possible to form a second phase to avoid the adverse effect of Si dissolved in the aluminum matrix on the thermal conductivity of aluminum alloy. Specifically, Si can react with Al, Fe, Cu, Mg, Mn, etc. to form Mg2Si, AlFeSi, AlMnSi, AlFeSiCu, AlFeMgSi, AlFeMnSi and other second phases;

[0104] (2) When the mass percentage of Fe is 0.4-0.8%, on the one hand, Fe can reduce the tendency of aluminum alloy castings to stick to the mold and improve the mechanical properties and thermal conductivity of the aluminum alloy. On the other hand, Fe can react with other elements as much as possible to form a second phase to avoid the adverse effect of Fe dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Fe can react with Al, Si, Mg, Cu, Mn, Ni, etc. to form Al3Fe, AlFeSi, AlFeMgSi, AlFeSiCu, AlFeSiNi, AlFeMgSiNi, AlFeMnSi, FeNiAl9 and other second phases;

[0105] (3) When the mass percentage of Cu is 0.001-0.05%, on the one hand, Cu can improve the mechanical properties, thermal conductivity, and fatigue resistance of aluminum alloys. On the other hand, Cu can react with other elements to form a second phase as much as possible to avoid the adverse effect of Cu dissolved in the aluminum matrix on the thermal conductivity of aluminum alloys. Specifically, Cu can react with Al, Fe, Si, Mg, Zn, etc. to form CuAl2, AlFeSiCu, Al2CuZn, (CuMg)Al2 and other second phases. In addition, Cu can also promote the precipitation of Mg2Si, Mg2Zn, Mg2SiZn, (CuMg)Al2, AlFeMgSi, AlFeMgSiNi and other second phases, increase their volume fraction and dispersion, and reduce the solid solubility of the above elements in the aluminum matrix.

[0106] (4) When the mass percentage of Mg is 0.05-0.4%, on the one hand, Mg can improve the mechanical properties and thermal conductivity of aluminum alloys. On the other hand, Mg can react with other elements to form a second phase as much as possible to avoid the adverse effect of Mg dissolved in the aluminum matrix on the thermal conductivity of aluminum alloys. Specifically, Mg can react with Al, Fe, Si, Cu, Zn, Ni, etc. to form Mg2Si, Mg2Zn, Mg2SiZn, (CuMg)Al2, AlFeMgSi, AlFeMgSiNi and other second phases. Mg can also promote the precipitation of CuAl2, AlFeSiCu, Al2CuZn, (CuMg)Al2 and other second phases, increase their volume fraction and dispersion, and reduce the solid solubility of the above elements in the aluminum matrix.

[0107] (5) When the mass percentage of Sr is 0.005-0.04%, on the one hand, Sr can be modified through the heterogeneous nucleation theory or twin valley mechanism to refine the second phase such as eutectic silicon, improve the thermal conductivity and mechanical properties of the aluminum alloy, and also transform the β-AlFeSi phase in the ingot into the Chinese character α-AlFeSi phase to improve the mechanical properties of the aluminum alloy. On the other hand, Sr can preferentially combine with elements such as Fe, Cu, Mn, Cr, and Si to form dispersion strengthening to avoid the adverse effect of Sr dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. In addition, Sr can also promote the precipitation of phases such as CuAl2 and Mg2Si to reduce the solid solubility of these alloying elements in the aluminum matrix.

[0108] (6) When the mass percentage of Zn is 0.001-0.05%, on the one hand, Zn can improve the mechanical properties of aluminum alloys, and on the other hand, Zn can react with other elements to form a second phase as much as possible to avoid the adverse effect of Zn dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, Zn can react with Al, Mg, Cu and Si to form second phases such as MgZn2, Mg2SiZn, Al2CuZn, etc. In addition, Zn can eliminate elemental Si to reduce the adverse effect of elemental Si on the performance of aluminum alloys. Zn can also promote the precipitation of phases such as Mg2Si and Al2Cu, thereby improving mechanical properties and thermal conductivity.

[0109] (7) When the mass percentage of Ni is 0.001-0.05%, on the one hand, Ni can be used to improve the mechanical properties and thermal conductivity of aluminum alloys. On the other hand, Ni can react with other elements to form a second phase as much as possible to avoid the adverse effect of Ni dissolved in the aluminum matrix on the thermal conductivity of aluminum alloys. Specifically, Ni can react with Al, Fe, Mg, Si, etc. to form Al3Ni, AlFeSiNi, AlFeMgSiNi, FeNiAl9 and other second phases, promoting the precipitation of elements such as Cu, Mg, Zn, Si, Fe dissolved in the alloy; Ni can also refine grains, promote the precipitation of strengthening phases such as CuAl2, (CuMg)Al2, Mg2Si, increase the volume fraction and dispersion of the precipitated phase, and reduce the solid solubility of alloy elements in the aluminum matrix. In addition, Ni and Cu, Mg can promote each other's precipitation to improve the thermal conductivity and mechanical properties of aluminum alloys.

[0110] (8) When the mass percentage of Co is not greater than 0.1%, Co can refine the grains to improve the thermal conductivity and mechanical properties of the aluminum alloy. On the other hand, it can also react with other elements to form a second phase as much as possible to avoid the adverse effect of Be dissolved in the aluminum matrix on the thermal conductivity of the aluminum alloy. Specifically, Co can react with Al, Fe, Si, etc. to form Al 15 (Fe, Co) 3 Si 2, Al 3 (Fe, Co) and other second phases. In addition, Co has a refining effect on the Al 3 Fe phase, which can transform the coarse needle-shaped and flake-shaped β-Al 3 Fe phase into small flower-shaped and fine strip-shaped α-Al 15 (Fe,Co)3Si2 phase can also promote the α-Al 15 The precipitation of (Fe, Co) 3 Si 2 phase further improves the mechanical properties and thermal conductivity of the aluminum alloy. The composite addition of Ni and Co can effectively modify Fe and transform the free Fe into the second phase. The composite addition of Co, Ni and Be can quickly reduce the solid solubility of each other in the alloy and increase the volume fraction of the second phase, thereby improving the mechanical properties and thermal conductivity of the aluminum alloy.

[0111] (9) When the mass percentage of Be is not more than 0.01%, Be can transform the eutectic Si phase from a lamellar phase to a fine phase to refine the Si phase, thereby reducing or eliminating the adverse effects of Si on the aluminum alloy. Be can also transform the plate-like β intermediate phase into a relatively harmless Chinese character-shaped Be-Fe (Al8Fe2SiBe) phase to reduce or eliminate the adverse effects of Fe on the properties of the aluminum alloy. It can also reduce the formation of Mg-containing Fe-rich phases, thereby increasing the Mg content in the aging process. On the other hand, Be can also combine with vacancies to prevent the migration and disappearance of vacancies. The addition of Be significantly increases the nucleation rate of the metastable phase, improves the strengthening effect of aging, and reduces the solid solubility of the above elements in the aluminum matrix. Ni and Be are combined, which greatly promotes the precipitation of the second phase and reduces the solid solubility of the alloying elements in the matrix.

[0112] (10) When the mass percentage of RE is 0.0001-0.1%, RE can form a rare earth active film on the surface of the Fe-containing phase or combine with Al, Fe, Ti and other atoms to form rare earth compounds to effectively reduce the solid solution of harmful elements in the aluminum matrix. It can also transform the long strip β-Fe phase into the spherical α-Fe phase and transform the elemental Si. On the other hand, RE can also promote the precipitation of dispersed phases such as CuAl2, (CuMg)Al2, Mg2Si, etc., and improve the mechanical properties of aluminum alloys. In addition, RE can also refine the grains, second phases and precipitated phases (for example, it can refine Al3RE, Al3Fe, Mg2Si phases, etc.), further improving the mechanical properties and thermal conductivity of aluminum alloys.

[0113] When the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni within the above content range is not more than 9% and the sum of the mass percentages of Cu, Mg, and Zn is 0.052-0.5%, Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni interact with each other as a whole, thereby removing the contents of transition elements Ti, Mn, Cr, and V in the aluminum matrix that have a great influence on thermal conductivity, refining the grains, reducing the solid solubility of the alloying elements in the aluminum matrix, and increasing the volume fraction of the precipitated phase, thereby reducing the adverse effects of the alloying elements on the thermal conductivity of the aluminum alloy and improving the comprehensive properties of the aluminum alloy (including mechanical properties, thermal conductivity, and forming properties, etc.). At the same time, under the further action of aging treatment, the solid solubility of each element in the aluminum matrix is ​​further reduced, which can eliminate the adverse effects of alloying elements on the thermal conductivity of aluminum alloy as much as possible, and the second phase (such as Al3Fe, Mg2Si, Al2Cu, AlFeSiNi, AlMnSi phases, etc.) can also be refined in the aluminum matrix and at the grain boundaries or within the grain boundaries, greatly improving the mechanical properties and thermal conductivity of the aluminum alloy.

[0114] The present invention also provides a heat dissipation structure. At least a portion of the heat dissipation structure is made of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy or the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy prepared by the method for preparing the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy. The heat dissipation structure exhibits excellent thermal conductivity and mechanical properties. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy exhibits excellent elongation and is suitable for fabrication into various structures using a variety of processes.

[0115] The heat dissipation structure can be used for filter housings of communication base stations, heat dissipation substrates of communication base stations, cabinet housings of communication base stations, housings for three-electric components of automobiles, automobile housings, heat sinks for computer equipment, mid-plates of mobile phones, housings of mobile phones, heat sinks for LED lights, thin components for 5G products, etc. Because this heat dissipation structure utilizes all technical solutions of all the aforementioned Al-Si die-cast aluminum alloy embodiments, it at least has all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and no further details are given here.

[0116] Example 1

[0117] The aluminum source is heated at 720°C to obtain aluminum liquid;

[0118] Adding Si, Fe, Cu, Mg, Sr, Zn, RE, and Ni to the aluminum liquid, and keeping the temperature at 700° C. for 30 minutes to obtain an alloy liquid;

[0119] After refining and skimming, the molten alloy was die-cast and aged to produce the Al-Si-Fe-Mg high thermal conductivity aluminum alloy of Example 1. The aging treatments included a first-stage low-temperature aging treatment at -200°C for 1 hour, a second-stage low-temperature aging treatment at 10°C for 3 hours, and a third-stage high-temperature aging treatment at 300°C for 5 hours. The molten alloy was die-cast at 660°C, with a die-casting speed of 0.5 m / s. The Al-Si-Fe-Mg high thermal conductivity aluminum alloy contains 5% Si by mass, 0.8% Fe by mass, 0.005% Cu by mass, 0.2% Mg by mass, 0.02% Sr by mass, 0.005% Zn by mass, 0.005% Ni by mass, and 0.01% RE by mass, wherein the sum of the mass percentages of Si, Fe, Cu, Mg, Sr, Zn, RE, and Ni is 6.045%, and the sum of the mass percentages of Cu, Mg, and Zn is 0.21%.

[0120] Comparative Example 1

[0121] The aluminum source is heated at 720°C to obtain aluminum liquid;

[0122] Adding Si, Fe, Cu, Sr, Zn, RE, and Ni to the aluminum liquid, and keeping the temperature at 700° C. for 30 minutes to obtain an alloy liquid;

[0123] After refining and skimming, the molten alloy was die-cast and aged to produce the Al-Si-Fe-Mg high-thermal-conductivity aluminum alloy of Comparative Example 1. The aging treatments included a first-stage low-temperature aging treatment at -200°C for 1 hour, a second-stage low-temperature aging treatment at 10°C for 3 hours, and a third-stage high-temperature aging treatment at 300°C for 5 hours. The molten alloy was die-cast at 660°C, with a die-casting speed of 0.5 m / s. The Al-Si-Fe-Mg high-thermal-conductivity aluminum alloy contained 5% Si by mass, 0.8% Fe by mass, 0.005% Cu by mass, 0.02% Sr by mass, 0.005% Zn by mass, 0.005% Ni by mass, and 0.01% RE by mass.

[0124] Comparative Example 2

[0125] The aluminum source is heated at 720°C to obtain aluminum liquid;

[0126] Adding Si, Fe, Cu, Mg, Sr, Zn, RE, and Ni to the aluminum liquid, and keeping the temperature at 700° C. for 30 minutes to obtain an alloy liquid;

[0127] After the alloy liquid was subjected to refining and slag removal, it was subjected to die casting and aging treatment to obtain the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy of Comparative Example 2. During the aging treatment, the temperature was 250°C and the time was 6 hours. The alloy liquid was die-casted at a temperature of 660°C, wherein the die casting speed of the die casting machine was 0.5 m / s. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contained 5% Si by mass, 0.8% Fe by mass, 0.005% Cu by mass, 0.2% Mg by mass, 0.02% Sr by mass, 0.005% Zn by mass, 0.005% Ni by mass, and 0.01% RE by mass.

[0128] Example 2

[0129] The aluminum source is heated at a temperature of 780° C. to obtain aluminum liquid, wherein the aluminum liquid may contain Mn, Cr, Ti, and V;

[0130] Adding Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni to the aluminum liquid, and maintaining the temperature at 750° C. for 10 minutes to obtain an alloy liquid;

[0131] After the alloy liquid is subjected to refining treatment and slag removal treatment, it is subjected to die casting treatment and aging treatment to obtain the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy of Example 2. The temperature of the aging treatment is 310°C and the time is 4h. The alloy liquid is die-casted at a temperature of 700ºC, wherein the die-casting speed of the die-casting machine is 2.5m / s. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 8% Si by mass, 0.4% Fe by mass, 0.02% Cu by mass, 0.2% Mg by mass, 0.02% Sr by mass, 0.01% Zn by mass, 0.001% Ni by mass, 0.002% Co by mass, 0.002% Be by mass, 0.01% RE by mass, and 0.01% RE by mass. The mass percentage content of Mn is 0.002%, the mass percentage content of Ti is 0.001%, the mass percentage content of Cr is 0.002%, and the mass percentage content of V is 0.001%. The sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE and Ni is 8.665%, the sum of the mass percentage contents of Cu, Mg and Zn is 0.23%, the mass ratio of Be, Co and Fe is 0.005:0.005:1, and the mass ratio of Co, Ni and Be is 1:0.5:1.

[0132] Example 3

[0133] The aluminum source is heated at a temperature of 750° C. to obtain aluminum liquid, wherein the aluminum liquid may contain Mn, Cr, Ti, and V;

[0134] Adding Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni to the aluminum liquid, and maintaining the temperature at 730° C. for 15 minutes to obtain an alloy liquid;

[0135] After refining and skimming, the molten alloy was die-cast and aged to produce the Al-Si-Fe-Mg high thermal conductivity aluminum alloy of Example 3. The aging treatments included a first-stage low-temperature aging treatment at -100°C for 5 hours, a second-stage low-temperature aging treatment at 50°C for 1 hour, and a third-stage high-temperature aging treatment at 320°C for 3 hours. The molten alloy was die-cast at 670°C, with the die-casting machine operating at a speed of 1 m / s. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 6% Si by mass, 0.5% Fe by mass, 0.05% Cu by mass, 0.4% Mg by mass, 0.03% Sr by mass, 0.01% Zn by mass, 0.05% Ni by mass, 0.01% Co by mass, 0.01% Be by mass, 0.1% RE by mass, 0.01% Zn ... The mass percentage content of Mn is 0.001%, the mass percentage content of Ti is 0.001%, the mass percentage content of Cr is 0.001%, and the mass percentage content of V is 0.001%. The sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE and Ni is 7.16%, the sum of the mass percentage contents of Cu, Mg and Zn is 0.46%, the mass ratio of Be, Co and Fe is 0.02:0.02:1, and the mass ratio of Co, Ni and Be is 1:5:1.

[0136] Example 4

[0137] The aluminum source is heated at 740° C. to obtain aluminum liquid, wherein the aluminum liquid may contain Mn, Cr, Ti, and V;

[0138] Adding Si, Fe, Cu, Mg, Sr, Zn, Co, Be, In, Nb, Bi, Ge, RE, and Ni to the aluminum liquid, and maintaining the temperature at 740°C for 20 minutes to obtain an alloy liquid;

[0139] After refining and skimming, the molten alloy was die-cast and aged to produce the Al-Si-Fe-Mg high thermal conductivity aluminum alloy of Example 4. The aging treatments included a first-stage low-temperature aging treatment at -150°C for 3 hours, a second-stage low-temperature aging treatment at 0°C for 10 hours, and a third-stage high-temperature aging treatment at 350°C for 2 hours. The molten alloy was die-cast at 680°C, with a die-casting speed of 2.5 m / s. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 6% Si by mass, 0.5% Fe by mass, 0.05% Cu by mass, 0.2% Mg by mass, 0.03% Sr by mass, 0.01% Zn by mass, 0.05% Ni by mass, 0.01% Co by mass, 0.01% Be by mass, 0.0001% RE by mass, 0.001% Mn by mass, 0.001% Ti by mass, 0.01% Zn by mass, 0.01 ... The content of Cr is 0.001% by mass, the content of V is 0.001% by mass, the content of In is 0.005% by mass, the content of Nb is 0.005% by mass, the content of Bi is 0.01% by mass, and the content of Ge is 0.003% by mass, wherein the sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE and Ni is 6.8601%, the sum of the mass percentage contents of Cu, Mg and Zn is 0.26%, the mass ratio of Be, Co and Fe is 0.02:0.02:1, and the mass ratio of Co, Ni and Be is 1:5:1.

[0140] Example 5

[0141] The aluminum source is heated at a temperature of 750° C. to obtain aluminum liquid, wherein the aluminum liquid may contain Mn, Cr, Ti, and V;

[0142] Adding Si, Fe, Cu, Mg, Sr, Zn, Mo, Ag, Sn, Te, RE, and Ni to the aluminum liquid, and keeping the temperature at 730°C for 10 minutes to obtain an alloy liquid;

[0143] After refining and deslagging, the molten alloy was die-cast and aged to obtain the Al-Si-Fe-Mg high thermal conductivity aluminum alloy of Example 5. The aging treatments included a first-stage low-temperature aging treatment at -160°C for 1 hour, a second-stage low-temperature aging treatment at 70°C for 1 hour, and a third-stage high-temperature aging treatment at 350°C for 0.1 hour. The molten alloy was die-cast at 680°C, with the die-casting machine operating at a speed of 1 m / s. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 5% Si by mass, 0.4% Fe by mass, 0.02% Cu by mass, 0.15% Mg by mass, 0.005% Sr by mass, 0.001% Zn by mass, 0.005% Ni by mass, 0.005% RE by mass, 0.001% Mn by mass, 0.001% Ti by mass, and 0.001% Cr by mass. , 0.001% V by mass, 0.003% Mo by mass, 0.001% Ag by mass, 0.1% Sn by mass, and 0.002% Te by mass, wherein the sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, RE and Ni is 5.586%, the sum of the mass percentage contents of Cu, Mg and Zn is 0.171%, the mass ratio of Be, Co and Fe is 0.0025:0.0025:1, and the mass ratio of Co, Ni and Be is 1:5:1.

[0144] Example 6

[0145] The aluminum source is heated at a temperature of 750° C. to obtain aluminum liquid, wherein the aluminum liquid may contain Mn, Cr, Ti, and V;

[0146] Adding Si, Fe, Cu, Mg, Sr, Zn, Be, Co, Cd, RE, and Ni to the aluminum liquid, and maintaining the temperature at 750° C. for 10 minutes to obtain an alloy liquid;

[0147] After refining and skimming, the molten alloy was die-cast and aged to produce the Al-Si-Fe-Mg high thermal conductivity aluminum alloy of Example 6. The aging treatments included a first-stage low-temperature aging treatment at 170°C for 7 hours, a second-stage low-temperature aging treatment at 25°C for 4 hours, and a third-stage high-temperature aging treatment at 300°C for 3 hours. The molten alloy was die-cast at 670°C, with a die-casting speed of 1 m / s. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 5.2% Si by mass, 0.45% Fe by mass, 0.03% Cu by mass, 0.18% Mg by mass, 0.01% Sr by mass, 0.02% Zn by mass, 0.005% Ni by mass, 0.003% Co by mass, 0.003% Be by mass, 0.001% Mn by mass, and 0. 0.001% Ti, 0.001% Cr, 0.001% V, 0.01% Cd, and 0.01% RE by mass, wherein the sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni is 5.911%, the sum of the mass percentage contents of Cu, Mg, and Zn is 0.23%, the mass ratio of Be, Co, and Fe is 0.007:0.007:1, and the mass ratio of Co, Ni, and Be is 1:1.7:1.

[0148] Table 1 Performance test results of Examples 1 to 6 and Comparative Examples 1 to 2

[0149]

[0150] Table 1 shows that the yield strength, elongation, and electrical conductivity of the Al-Si-Fe-Mg high thermal conductivity aluminum alloys of Examples 1 to 6 are superior to those of the Al-Si-Fe-Mg high thermal conductivity aluminum alloys of Comparative Examples 1 and 2. Furthermore, the Al-Si-Fe-Mg high thermal conductivity aluminum alloys of Examples 1 to 6 simultaneously meet the following requirements: thermal conductivity greater than 200, yield strength greater than 130 MPa, and elongation greater than 16%, demonstrating their promising market application prospects.

[0151] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An Al-Si-Fe-Mg series high thermal conductivity aluminum alloy containing aluminum, characterized in that: The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.11-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, 0-0.01% Be by mass, and 0.0001-0.1% RE by mass, wherein Si, Fe, Cu The sum of the mass percentage contents of Mg, Sr, Zn, Co, Be, RE, and Ni is not more than 9%, and the sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%. The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy is subjected to die casting and aging treatment, and the aging treatment includes a primary low-temperature aging treatment, a secondary low-temperature aging treatment, and a tertiary high-temperature aging treatment, wherein the temperature of the primary low-temperature aging treatment is -100°C to -200°C, and the time is 1h to 15h; the temperature of the secondary low-temperature aging treatment is 0°C to 70°C, and the time is 1h to 24h; the temperature of the tertiary high-temperature aging treatment is 280°C to 350°C, and the time is 0.05h to 15h.

2. The Al-Si-Fe-Mg based high thermal conductivity aluminum alloy according to claim 1, characterized in that: The sum of the mass percentage contents of Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni shall not exceed 9%.

3. The Al-Si-Fe-Mg based high thermal conductivity aluminum alloy according to claim 1, characterized in that: The sum of the mass percentage contents of Cu, Mg, and Zn is 0.052-0.5%.

4. The Al-Si-Fe-Mg based high thermal conductivity aluminum alloy according to claim 1, characterized in that: Meet at least one of the following conditions: The mass ratio of Si to Fe is 5-20:1; The mass ratio of Si to Sr is 200-1500:1; The mass ratio of Fe and Co is 1-250:1; The mass ratio of Mg to Cu is 1-50:1; The mass ratio of Mg, Cu, and Zn is 5-500:0.1-20:1; The mass ratio of Co, Ni, and Be is 0.1-100:0.4-50:1; The mass ratio of Be, Co, and Fe is 0.001-0.03:0.004-0.25:1; The sum of the mass percentages of Cu, Mg, Zn, and Ni is 0.057-0.55%; RE is at least one of La, Ce, Pr, Nd, Er, Sm, Y, and Gd; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Mn, Ti, Cr, and V, and the sum of the mass percentages of Mn, Ti, Cr, and V is not greater than 0.03%; The mass percentage content of a single impurity in the Al-Si-Fe-Mg high thermal conductivity aluminum alloy is less than 0.02%, and the total mass percentage content of the impurities is less than 0.1%.

5. The Al-Si-Fe-Mg based high thermal conductivity aluminum alloy according to any one of claims 1 to 4, characterized in that: Meet at least one of the following conditions: The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains In in a mass percentage content of 0-0.009%; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Nb in an amount of 0-0.005% by mass; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Bi in a mass percentage content of 0-0.01%; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Ge in a mass percentage content of 0-0.005%; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Mo in a mass percentage content of 0-0.005%; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains 0-0.005% by mass of Ag; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Sn in a mass percentage content of 0-0.15%; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Te in a mass percentage content of 0-0.005%; The Al-Si-Fe-Mg series high thermal conductivity aluminum alloy further contains Cd in an amount of 0-0.01% by mass.

6. The Al-Si-Fe-Mg based high thermal conductivity aluminum alloy according to claim 5, characterized in that: Meet at least one of the following conditions: When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains In, the mass ratio of Cu to In is 0.2-40:1; When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains Nb, the mass ratio of Ni to Nb is 0.1-10:1; When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains Bi, the mass ratio of Mg to Bi is 5-400:1; When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains Ge, the mass ratio of Si to Ge is 1000-2000:1; When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains Mo, the mass ratio of Si to Mo is 1500-2000:1; When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains Ag, the mass ratio of Mg to Ag is 10-1000:1, and the mass ratio of Cu to Ag is 1-500:1; When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains Sn and Te, the mass ratio of Mg to Sn is 0.5-15:1, and the mass ratio of Te to Sn is 0.01-1:1; When the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains Cd, the mass ratio of RE, Sr, and Fe is 0.002-0.1:0.02-0.08:1, and the mass ratio of RE to Cd is 0.1-25:

1.

7. The Al-Si-Fe-Mg based high thermal conductivity aluminum alloy according to claim 5, characterized in that: The Al-Si-Fe-Mg high thermal conductivity aluminum alloy also contains 0.0001-0.009% In by mass, 0.0001-0.005% Nb by mass, 0.001-0.005% Bi by mass, 0.0001-0.005% Ge by mass, 0.0001-0.005% Mo by mass, 0.0001-0.005% Ag by mass, 0.005-0.1% Sn by mass, 0.0001-0.005% Te by mass, and 0.001-0.008% Cd by mass.

8. A method for preparing the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy according to any one of claims 1 to 7, comprising the following steps: The aluminum source is subjected to a first heating treatment to obtain aluminum liquid; adding Si, Fe, Cu, Mg, Sr, Zn, Co, Be, RE, and Ni to the aluminum liquid and performing a second heating treatment to obtain an alloy liquid; Refining and slagging the alloy liquid, and testing its composition and content; and After the composition and content are tested to be qualified, the alloy liquid after the refining treatment and the slag removal treatment is subjected to die casting and aging treatment to obtain an Al-Si-Fe-Mg series high thermal conductivity aluminum alloy, wherein the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy contains 5-8% Si by mass, 0.4-0.8% Fe by mass, 0.001-0.05% Cu by mass, 0.11-0.4% Mg by mass, 0.005-0.04% Sr by mass, 0.001-0.05% Zn by mass, 0.001-0.05% Ni by mass, 0-0.1% Co by mass, and 0.1% by mass of Mg by mass. The present invention relates to a method for preparing a sintered aluminum alloy having a sintered aluminum alloy and ...

9. The method for preparing the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy according to claim 8, characterized in that: Meet at least one of the following conditions: The aluminum source is at least one of original aluminum, aluminum ingot, and recycled aluminum; The preparation method of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy also includes the step of adding at least one of In, Nb, Bi, Ge, Mo, Ag, Sn, Te, and Cd to the aluminum liquid.

10. A heat dissipation structure, characterized in that: At least part of the heat dissipation structure is made of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy described in any one of claims 1 to 7, or the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy prepared by the preparation method of the Al-Si-Fe-Mg series high thermal conductivity aluminum alloy described in any one of claims 8 to 9.

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