High-strength heat-resistant aluminum-magnesium-silicon-titanium alloy as well as preparation method and application thereof

Abstract

The invention discloses a high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy as well as a preparation method and application thereof, and the high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy comprises the following components in percentage by mass: 2.6 to 4.2 percent of Mg, 1.2 to 2.4 percent of Si, 0.5 to 2.2 percent of Ti, 0.25 to 1.1 percent of Zr, 0.20 to 1.5 percent of Cr and the balance of Al and inevitable impurities. The high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy is used under the condition of 300 DEG C, and the tensile strength is improved by 68.64%; and when the alloy is used at 400 DEG C, the tensile strength is improved by 70.59%. The strength and the stability of the prepared aluminum-magnesium-silicon-titanium alloy are greatly improved at high temperature.

Description

Technical Field

[0001] The present invention belongs to the field of metallurgical technology, and further belongs to the field of alloy processing technology. Specifically, it relates to a high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy and its preparation method and application. Background Art

[0002] Aluminum-magnesium-silicon alloy is an aluminum alloy based on aluminum, with magnesium and silicon added as the main alloying elements. It has good corrosion resistance, excellent processing performance and good welding performance, and is widely used in the construction industry, automotive industry, electronic industry and aerospace field. When aluminum-magnesium-silicon is used at a temperature close to or exceeding 300 °C, the strengthening phases in the alloy will aggregate and grow, resulting in weakened strengthening effect, reduced strength and hardness of the alloy, showing a gradual decrease in strength; and when serving in a long-term high-temperature environment, the phase structure in the alloy will change, and some metastable phases will transform into stable phases. This tissue transformation may cause a slight change in the volume of the alloy, thereby affecting the dimensional accuracy and performance stability of the parts, and the tissue stability of the aluminum-magnesium-silicon alloy will be affected. In addition, during the thermal cycle process, due to the difference in the thermal expansion coefficients of different phases, thermal stress will be generated inside the alloy, which may lead to the initiation and propagation of cracks after long-term accumulation, reducing the service life of the alloy. For the above reasons, the high-temperature strength of aluminum-magnesium-silicon decreases and the thermal stability is insufficient, which limits the application scenarios of aluminum-magnesium-silicon. How to obtain a high-strength heat-resistant aluminum-magnesium-silicon alloy and expand the application environment of aluminum-magnesium-silicon alloy. Summary of the Invention

[0003] The first object of the present invention is to provide a high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy; the second object is to provide a preparation method of the high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy; the third object is to provide an application of the high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy.

[0004] The first object of the present invention is achieved as follows. The high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy, by mass percentage, includes: Mg: 2.6 - 4.2 wt.%, Si: 1.2 - 2.4 wt.%, Ti: 0.5 - 2.2 wt.%, Zr: 0.25 - 1.1 wt.%, Cr: 0.20 - 1.5 wt.%, and the balance is Al and unavoidable impurities.

[0005] The second object of the present invention is achieved as follows, including alloying, refining and degassing, casting into ingots and post-treatment steps, specifically including: A. Alloying: After completely melting pure aluminum, successively add Al-20Si, Al-10Ti, Al-10Zr, Al-5Cr and pure magnesium for melting to obtain melt a; B. Refining and degassing: Control the temperature of melt a at 725 - 740 °C for slagging, and obtain alloy melt b after refining and degassing with a refining agent and nitrogen; C. Ingot casting: After keeping the alloy melt b at a temperature of 725 - 740 °C for 15 - 20 min, it is poured into a mold for semi-rapid solidification, and an ingot c is obtained after water cooling. D. Post-treatment: The ingot c is subjected to homogenization treatment, surface milling, cold rolling, solution heat treatment, and aging treatment to obtain the target high-strength heat-resistant Al-Mg-Si-Ti alloy.

[0006] The specific operations are as follows: The alloy composition, by mass percentage, includes: Mg: 2.6 - 4.2 wt.%, Si: 1.2 - 2.4 wt.%, Ti: 0.5 - 2.2 wt.%, Zr: 0.25 - 1.1 wt.%, Cr: 0.25 - 1.1 wt.%, and the remaining component is Al.

[0007] Raw materials: pure aluminum, pure magnesium, Al-20Si, Al-10Ti, Al-10Zr, Al-5Cr. Auxiliary materials: slagging agent and refining agent (including one or more of KCl, BaCl, CaF2, CaCl2, MgCl2, and MgF2); the purification gas is nitrogen.

[0008] Among them, the mass ratio of Mg:Si is 1.5 - 2; the mass ratio of Ti:Zr is 2; Process: First, add pure aluminum. After the pure aluminum is completely melted, successively add Al-20Si, Al-10Ti, Al-10Zr, Al-5Cr, and pure magnesium. The melting temperature is: 740 - 765 °C; after the metal is melted, the temperature is lowered to 725 - 740 °C, nitrogen is introduced into the melt, and the gas injection time is 5 - 7 min; let it stand for 15 - 20 min; preheat the casting mold for 30 min, and evenly coat the inner surfaces of the mold and the crucible with zinc oxide coating. When the temperature of the metal melt is 730 °C, pour it into the mold. After the metal solution solidifies, quickly put it into water for cooling to obtain an ingot. Put the ingot into a resistance box for homogenization treatment, the heat treatment temperature is 530 °C, and the time is 10 h; then carry out surface milling, cold rolling, solution heat treatment, and aging treatment (the total cold rolling deformation amount is 60 - 70%; the solution heat treatment temperature is 530 - 545 °C, the holding time is 2 h, the aging treatment temperature is 175 °C - 185 °C, and the time is 5 - 8 h) The third object of the present invention is achieved as such, the application of the high-strength heat-resistant Al-Mg-Si-Ti alloy in the preparation of aerospace structural components.

[0009] The technical principle of the present invention is as follows: 1) The alloy composition is optimized by adding Ti and Zr, and the ratio of Ti and Zr is optimized to be 2. Adding Ti can refine the grains of the aluminum-magnesium-silicon alloy. During the solidification process of the alloy, Ti atoms serve as the core of heterogeneous nucleation, increasing the number of crystal nuclei, thus refining the grains. The smaller the grain size, the larger the grain boundary area, and the stronger the hindrance effect of the grain boundary on the movement of dislocations. When the material is subjected to an external force, the movement of dislocations is blocked by the grain boundary and it is difficult to cross the grain boundary and continue to move, which makes it more difficult to undergo plastic deformation and thus improves the strength of the alloy. Ti can form fine and dispersed intermetallic compounds (Ti3Al, Al3Ti), which hinder the movement of dislocations and improve the high-temperature strength and heat resistance of the alloy. After adding Ti, the recrystallization temperature of the aluminum-magnesium-silicon alloy is increased. At high temperatures, recrystallization occurs in metal materials, resulting in grain growth and thus reducing the strength and hardness of the material. However, titanium atoms in the alloy can hinder the diffusion of atoms and the migration of grain boundaries, causing the alloy to undergo recrystallization at a higher temperature. In this way, in a high-temperature environment, the alloy can maintain a fine grain structure and high strength, thereby improving the heat resistance of the alloy. 2) Optimize the magnesium-silicon ratio to form a suitable Mg2Si phase. The Mg2Si phase is finely, uniformly and dispersedly distributed, improving the strength and heat resistance of the alloy; 3) Optimize the heat treatment process. Heat the alloy to a higher temperature to fully dissolve the alloying elements in the aluminum matrix to form a uniform solid solution. Subsequently, rapidly cool it to retain the solid solution structure at high temperature, providing a supersaturated solid solution for subsequent aging treatment and improving the strength and heat resistance of the alloy. The alloy after solution treatment is held at a certain temperature for a period of time to precipitate the alloying elements in the supersaturated solid solution to form fine and dispersed strengthening phases, improving the hardness, strength and heat resistance of the alloy. By optimizing the composition design and process parameters, the performance of the aluminum-magnesium-silicon-titanium alloy is improved.

[0010] The high-strength and heat-resistant aluminum-magnesium-silicon-titanium alloy described in the present invention is used under the condition of 300 °C, and the tensile strength is increased by 76.3%; when used under the condition of 350 °C, the tensile strength is increased by 68%; when used under the condition of 400 °C, the tensile strength is increased by 63%; when used under the condition of 450 °C, the tensile strength is increased by 57%. The strength of the prepared aluminum-magnesium-silicon-titanium alloy has been greatly improved in terms of strength and stability at high temperatures. Specific embodiments

[0011] The following further illustrates the present invention with reference to embodiments, but the present invention is not limited in any way. Any transformation or replacement based on the teachings of the present invention falls within the protection scope of the present invention.

[0012] The high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy described in the present invention, by mass percentage, includes: Mg: 2.6 - 4.2 wt.%, Si: 1.2 - 2.4 wt.%, Ti: 0.5 - 2.2 wt.%, Zr: 0.25 - 1.1 wt.%, Cr: 0.25 - 1.1 wt.%, and the balance is Al and inevitable impurities.

[0013] The preparation method of the high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy described in the present invention includes alloying, refining and degassing, casting into ingots and post-treatment steps, specifically including: A. Alloying: After completely melting pure aluminum, successively add Al-20Si, Al-10Ti, Al-10Zr, Al-5Cr and pure magnesium for melting to obtain melt a; B. Refining and degassing: Control the temperature of melt a at 725 - 740 °C for slagging, and obtain alloy melt b after refining and degassing with a refining agent and nitrogen; C. Casting into ingots: After keeping alloy melt b at a temperature of 725 - 740 °C for 15 - 20 min, then pour it into a mold for semi-rapid solidification, and obtain ingot c after water cooling; D. Post-treatment: After subjecting ingot c to homogenization treatment, surface milling, cold rolling, solution heat treatment and aging treatment, obtain the target high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy.

[0014] The refining agent described in step B is one or several of KCl, BaCl2, CaF2, CaCl2, MgCl2 and MgF2.

[0015] The rate of semi-rapid solidification described in step C is 10 - 300 °C / s.

[0016] The homogenization treatment described in step D is to put ingot c into a resistance box for homogenization treatment, the heat treatment temperature is 500 - 550 °C, and the time is 8 - 12 h.

[0017] The total deformation amount of cold rolling processing described in step D is 60 - 70%.

[0018] The temperature of solution heat treatment described in step D is 530 - 545 °C, and the time is 1 - 3 h.

[0019] The temperature of aging treatment described in step D is 175 - 185 °C, and the time is 5 - 8 h.

[0020] The application described in the present invention is the application of the high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy in the preparation of aerospace structural parts The following further illustrates the present invention with specific implementation cases: Comparative Example 1 Weigh 0.3 kg of Mg, 0.75 kg of Al-20Si alloy, 1 kg of Al-10Ti alloy, 0.2 kg of Al-10Zr alloy in proportion (Mg: 3 wt.%, Si: 1.5 wt.%, Ti: 1 wt.%, Zr: 0.2 wt.%), and the balance is aluminum. First, add pure aluminum. After the pure aluminum is completely melted, add Al-20Si, Al-10Ti, Al-10Zr, and pure magnesium in sequence. The melting temperature is: 750 °C; after the metal is melted, the temperature is reduced to 730 °C, nitrogen is introduced into the melt, and the gas injection time is 5 min; let it stand for 15 min; preheat the casting mold for 30 min, and apply zinc oxide coating evenly on the inner surfaces of the mold and the crucible. When the temperature of the molten metal is 730 °C, pour it into the mold. After the metal solution solidifies, quickly put it into water for cooling to obtain an ingot. Put the ingot into a resistance box for homogenization treatment. The heat treatment temperature is 530 °C and the time is 10 h; then carry out surface milling, cold rolling, solution heat treatment and aging treatment (the total cold rolling deformation is 60%; the solution heat treatment temperature is 530 °C, the holding temperature is 2 h, the aging treatment temperature is 180 °C, and the time is 5 h). The samples are tested. The tensile strength at 300 °C is 142 MPa (118 MPa for aluminum-magnesium-silicon, and the increase ratio is 20.34%), and the tensile strength at 400 °C is 62 MPa (51 MPa for aluminum-magnesium-silicon, and the increase ratio is 21.57%).

[0021] Comparative Example 2 Weigh 0.3 kg of Mg, 0.75 kg of Al-20Si alloy, 1 kg of Al-10Ti alloy, 0.5 kg of Al-10Zr alloy in proportion (Mg: 3 wt.%, Si: 1.5 wt.%, Ti: 1 wt.%, Zr: 0.5 wt.%), and the balance is aluminum. First, add pure aluminum. After the pure aluminum is completely melted, add Al-20Si, Al-10Ti, Al-10Zr, and pure magnesium in sequence. The melting temperature is: 750 °C; after the metal is melted, the temperature is lowered to 730 °C, nitrogen is introduced into the melt, and the gas injection time is 5 min; let it stand for 15 min; preheat the casting mold for 30 min, and apply zinc oxide coating evenly on the inner surfaces of the mold and the crucible. When the temperature of the molten metal is 730 °C, pour it into the mold, and quickly put it into water for cooling after the metal solution solidifies to obtain an ingot. Put the ingot into a resistance box for homogenization treatment, the heat treatment temperature is 530 °C, and the time is 10 h; then carry out surface milling, cold rolling, solution heat treatment and aging treatment (the total cold rolling deformation is 60%; the solution heat treatment temperature is 530 °C, the holding temperature is 2 h, the aging treatment temperature is 180 °C, and the time is 5 h). The sample is tested, the tensile strength at 300 °C is 189 MPa (the aluminum-magnesium-silicon is 118 MPa, and the increase ratio is 60.17%), and the tensile strength at 400 °C is 84 MPa, (the aluminum-magnesium-silicon is 51 MPa, and the increase ratio is 64.71%).

[0022] Comparative Example 3 Weigh 0.3 kg of Mg, 0.75 kg of Al-20Si alloy, 1 kg of Al-10Ti alloy, and 1.2 kg of Al-10Zr alloy according to the proportion (Mg: 3 wt.%, Si: 1.5 wt.%, Ti: 1 wt.%, Zr: 1.2 wt.%), with the balance being aluminum. First, add pure aluminum. After the pure aluminum is completely melted, add Al-20Si, Al-10Ti, Al-10Zr, and pure magnesium in sequence. The melting temperature is 750 °C. After the metal melts, the temperature is reduced to 730 °C. Nitrogen is introduced into the melt for 5 minutes. Let it stand for 15 minutes. Preheat the casting mold for 30 minutes. Coat the inner surfaces of the mold and the crucible evenly with zinc oxide coating. When the temperature of the molten metal is 730 °C, pour it into the mold. After the metal solution solidifies, quickly put it into water for cooling to obtain an ingot. Place the ingot in a resistance box for homogenization treatment. The heat treatment temperature is 530 °C and the time is 10 h. Then, perform surface milling, cold rolling, solution heat treatment, and aging treatment (the total cold rolling deformation is 60%; the solution heat treatment temperature is 530 °C, the holding time is 2 h, the aging treatment temperature is 180 °C, and the time is 5 h). The sample is tested. The tensile strength at 300 °C is 148 MPa (118 MPa for aluminum-magnesium-silicon, with an increase ratio of 25.42%), and the tensile strength at 400 °C is 66 MPa (51 MPa for aluminum-magnesium-silicon, with an increase ratio of 29.41%).

[0023] Example 1

[0024] Weigh 0.3 kg of Mg, 0.75 kg of Al-20Si alloy, 1 kg of Al-10Ti alloy, 0.5 kg of Al-10Zr alloy, 1 kg of Al-5Cr alloy in proportion (Mg: 3 wt.%, Si: 1.5 wt.%, Ti: 1 wt.%, Zr: 0.5 wt.%, Cr: 0.5 wt.%), and the balance is aluminum. First, add pure aluminum. After the pure aluminum is completely melted, add Al-20Si, Al-10Ti, Al-10Zr, Al-5Cr, and pure magnesium in sequence. The melting temperature is: 750 °C; after the metal is melted, the temperature is reduced to 730 °C, and nitrogen is introduced into the melt for 5 minutes; let it stand for 15 minutes; preheat the casting mold for 30 minutes, and evenly apply zinc oxide coating on the inner surfaces of the mold and the crucible. When the temperature of the molten metal is 730 °C, pour it into the mold, and quickly put it into water for cooling after the metal solution solidifies to obtain an ingot. Put the ingot into a resistance box for homogenization treatment. The heat treatment temperature is 530 °C and the time is 10 h; then carry out surface milling, cold rolling, solution heat treatment and aging treatment (the total cold rolling deformation is 60%; the solution heat treatment temperature is 530 °C, the holding time is 2 h, the aging treatment temperature is 180 °C, and the time is 5 h). The sample is tested. The tensile strength at 300 °C is 192 MPa (118 MPa for aluminum-magnesium-silicon, and the increase ratio is 62.71%), and the tensile strength at 400 °C is 85 MPa (51 MPa for aluminum-magnesium-silicon, and the increase ratio is 66.67%).

[0025] Example 2

[0026] Weigh 0.25 kg of Mg, 0.75 kg of Al-20Si alloy, 1.5 kg of Al-10Ti alloy, 0.5 kg of Al-10Zr alloy, 1 kg of Al-5Cr alloy in proportion (Mg: 2.5 wt.%, Si: 1.5 wt.%, Ti: 1.5 wt.%, Zr: 0.75 wt.%, Cr: 0.5 wt.%), and the balance is aluminum. First, add pure aluminum. After the pure aluminum is completely melted, add Al-20Si, Al-10Ti, Al-10Zr, Al-5Cr, and pure magnesium in sequence. The melting temperature is: 755 °C; after the metal is melted, the temperature is reduced to 733 °C, nitrogen is introduced into the melt, and the gas injection time is 5 min; let it stand for 15 min; preheat the casting mold for 30 min, and apply zinc oxide coating evenly on the inner surfaces of the mold and the crucible. When the temperature of the molten metal is 730 °C, pour it into the mold. After the metal solution solidifies, quickly put it into water for cooling to obtain an ingot. Put the ingot into a resistance box for homogenization treatment. The heat treatment temperature is 530 °C and the time is 10 h; then carry out surface milling, cold rolling, solution heat treatment and aging treatment (the total cold rolling deformation is 60%; the solution heat treatment temperature is 530 °C, the holding temperature is 2 h, the aging treatment temperature is 180 °C, and the time is 5 h). The sample is tested. The tensile strength at 300 °C is 193 MPa (118 MPa for aluminum-magnesium-silicon, and the increase ratio is 63.56%), and the tensile strength at 400 °C is 86 MPa (51 MPa for aluminum-magnesium-silicon, and the increase ratio is 68.63%).

[0027] Example 3

[0028] Weigh 0.3 kg of Mg, 0.75 kg of Al-20Si alloy, 1 kg of Al-10Ti alloy, 0.5 kg of Al-10Zr alloy, 1.2 kg of Al-5Cr alloy in proportion (Mg: 3 wt.%, Si: 1.5 wt.%, Ti: 1 wt.%, Zr: 0.5 wt.%, Cr: 0.6 wt.%), and the balance is aluminum. First, add pure aluminum. After the pure aluminum is completely melted, add Al-20Si, Al-10Ti, Al-10Zr, and pure magnesium in sequence. The melting temperature is: 755 °C; after the metal is melted, the temperature is reduced to 740 °C, nitrogen is introduced into the melt, and the gas injection time is 6 min; let it stand for 15 min; preheat the casting mold for 30 min, and apply zinc oxide coating evenly on the inner surfaces of the mold and the crucible. When the temperature of the molten metal is 730 °C, pour it into the mold. After the metal solution solidifies, quickly put it into water for cooling to obtain an ingot. Put the ingot into a resistance box for homogenization treatment. The heat treatment temperature is 530 °C and the time is 10 h; then carry out milling, cold rolling, solution heat treatment and aging treatment (the total cold rolling deformation is 70%; the solution heat treatment temperature is 530 °C, the holding temperature is 2 h, the aging treatment temperature is 180 °C, and the time is 5 h). The samples are tested. The tensile strength at 300 °C is 185 MPa (118 MPa for aluminum-magnesium-silicon, with an increase ratio of 56.78%), and the tensile strength at 400 °C is 82 MPa (51 MPa for aluminum-magnesium-silicon, with an increase ratio of 60.78%).

[0029] Example 4

[0030] Weigh 0.3 kg of Mg, 0.75 kg of Al-20Si alloy, 1.2 kg of Al-10Ti alloy, 0.8 kg of Al-10Zr alloy, and 2.4 kg of Al-5Cr alloy in proportion (Mg: 3 wt.%, Si: 1.5 wt.%, Ti: 1.2 wt.%, Zr: 0.8 wt.%, Cr: 1.2 wt.%), with the balance being aluminum. First, add pure aluminum. After the pure aluminum is completely melted, add Al-20Si, Al-10Ti, Al-10Zr, and pure magnesium in sequence. The melting temperature is 755 °C. After the metal is melted, the temperature is reduced to 740 °C. Nitrogen is introduced into the melt for 6 minutes. Let it stand for 15 minutes. Preheat the casting mold for 30 minutes. Apply zinc oxide coating evenly on the inner surfaces of the mold and the crucible. When the temperature of the molten metal is 730 °C, pour it into the mold. After the metal solution solidifies, quickly put it into water for cooling to obtain an ingot. Place the ingot in a resistance furnace for homogenization treatment. The heat treatment temperature is 530 °C and the time is 10 h. Then, perform surface milling, cold rolling, solution heat treatment, and aging treatment (the total cold rolling deformation is 70%; the solution heat treatment temperature is 530 °C, the holding temperature is 2 h, the aging treatment temperature is 180 °C, and the time is 5 h). The sample is tested. The tensile strength at 300 °C is 199 MPa (for aluminum-magnesium-silicon it is 118 MPa, with an increase ratio of 68.64%), and the tensile strength at 400 °C is 87 MPa (for aluminum-magnesium-silicon it is 51 MPa, with an increase ratio of 70.59%).

Claims

1. A high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy, characterized in that, The described high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy, by mass percentage, includes: Mg: 2.6 - 4.2 wt.%, Si: 1.2 - 2.4 wt.%, Ti: 0.5 - 2.2 wt.%, Zr: 0.25 - 1.1 wt.%, Cr: 0.20 - 1.5 wt.%, and the balance is Al and unavoidable impurities.

2. A method for preparing the high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy according to claim 1, characterized in that, It includes alloying, refining and degassing, casting into ingots and post-treatment steps, specifically including: A. Alloying: After completely melting pure aluminum, successively add Al-20Si, Al-10Ti, Al-10Zr, Cr:Al-5Cr, and pure magnesium for melting to obtain melt a; B. Refining and degassing: Control the temperature of melt a at 725 - 740 °C for slagging, and obtain alloy melt b after refining and degassing with a refining agent and nitrogen; C. Casting into ingots: After keeping alloy melt b at a temperature of 725 - 740 °C for 15 - 20 min, then pour it into a mold for sub-rapid solidification, and obtain ingot c after water cooling; D. Post-treatment: After subjecting ingot c to homogenization treatment, surface milling, cold rolling, solution heat treatment and aging treatment, obtain the target high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy.

3. The preparation method according to claim 2, characterized in that, The refining agent described in step B is one or several of KCl, BaCl2, CaF2, CaCl2, MgCl2 and MgF2.

4. The preparation method according to claim 2, characterized in that, The rate of sub-rapid solidification described in step C is 10 - 300 °C / s.

5. The preparation method according to claim 2, wherein, The homogenization treatment described in step D is to put ingot c into a resistance box for homogenization treatment, the heat treatment temperature is 500 - 550 °C, and the time is 8 - 12 h.

6. The preparation method according to claim 2, characterized in that, The total deformation amount of the cold rolling process described in step D is 60 - 70%.

7. The preparation method according to claim 2, characterized in that, The temperature of the solution heat treatment described in step D is 530 - 545 °C, and the time is 1 - 3 h.

8. The preparation method according to claim 2, characterized in that, The temperature of the aging treatment described in step D is 175 - 185 °C, and the time is 5 - 8 h.

9. The application of the high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy according to claim 1, characterized in that, The application of the described high-strength heat-resistant aluminum-magnesium-silicon-titanium alloy in the preparation of aerospace structural parts.