A high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu and a preparation method thereof

Abstract

The present invention belongs to the technical field of metal material processing, and specifically relates to a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu and a preparation method. The composition of the alloy in terms of mass percentage is Mg: 0.4-0.8%, Si: 0.2-0.6%, high entropy alloy AlFeCrCoCu: 0.1-0.3%, and the rest is Al and inevitable impurity elements. The method for preparing the alloy is: casting-solid solution treatment-equal channel angular extrusion-low temperature rolling-aging treatment, and the obtained Al-Mg-Si alloy has high strength and good conductivity, which solves the problem that the strength and conductivity of aluminum alloys are contradictory and cannot be obtained at the same time. The Al-Mg-Si alloy prepared by the present invention has a tensile strength of up to 386MPa and a conductivity of 58.14%IACS, and has relatively excellent comprehensive performance.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material processing, and in particular relates to a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu and a preparation method thereof. Background Art

[0002] Al-Mg-Si alloys have good electrical properties and corrosion resistance, and are heat-treatable and strengthened aluminum alloys. Al-Mg-Si alloy conductors also have many advantages such as large conductive capacity, high tensile strength, light weight, and good sag characteristics. They are widely used in conductive aluminum materials, especially in overhead large-span lines.

[0003] The Al-Mg-Si aluminum alloy products currently used in the cable manufacturing industry have a tensile strength of 255-325Mpa and a conductivity of 52.5%-54%. The main strengthening mechanisms of Al-Mg-Si alloys include solid solution strengthening, precipitation strengthening, fine grain strengthening, and deformation strengthening. The existing methods for improving the strength of aluminum alloys will reduce the conductivity of aluminum alloys. Therefore, obtaining Al-Mg-Si alloys with both high strength and conductivity is the biggest challenge currently faced. Summary of the invention

[0004] The purpose of the present invention is to provide a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu and a preparation method thereof. The high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu provided by the present invention not only has high tensile strength and electrical conductivity, but also has a relatively simple processing technology and is easy to operate.

[0005] In order to achieve the above technical objectives, the technical solution provided by the present invention is as follows:

[0006] A high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu, the composition of which is as follows by mass percentage: Mg: 0.4-0.8%, Si: 0.2-0.6%, high-entropy alloy AlFeCrCoCu: 0.1-0.3%, and the rest is Al and some inevitable impurity elements.

[0007] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu comprises the following operations:

[0008] (1) Melting: The composition by mass percentage is: Mg: 0.4-0.8%, Si: 0.2-0.6%, high entropy alloy AlFeCrCoCu: 0.1-0.3%, and the rest is Al and some inevitable impurity elements. The above element raw materials except the high entropy alloy AlFeCrCoCu are melted to obtain aluminum liquid;

[0009] Among them, the smelting temperature is 750-780°C.

[0010] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is continued to be maintained at 750°C to 780°C, and a high entropy alloy AlFeCrCoCu is added. The temperature is kept for 1-3 hours, and then degassing and slag removal are carried out. After keeping the temperature for 10-30 minutes, the slag is removed and casting is carried out;

[0011] The gases introduced during degassing are chlorine and argon, and casting is carried out in an oxygen-free environment to obtain an ingot with a diameter of 50-100 mm.

[0012] (3) Sawing and milling: sawing and milling the ingot obtained in step (2) to form an ingot with a size of 12*12*80 mm;

[0013] (4) Solution treatment: subjecting the ingot obtained in step (3) to solution treatment and water quenching;

[0014] The solution treatment is carried out at a temperature of 510-550°C for 1-3 hours, followed by water quenching and cooling to room temperature.

[0015] (5) Equal channel angular pressing: subjecting the ingot obtained in step (4) to equal channel angular pressing deformation;

[0016] The number of passes for equal channel angular extrusion is 1-4.

[0017] (6) Low temperature rolling: The aluminum alloy obtained in step (5) is rolled and deformed in a low temperature environment to obtain a plate; the low temperature environment for rolling is -200--50°C, the reduction is 50-90%, and the deformation amount of each rolling is 5-10%.

[0018] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is subjected to aging treatment, and then naturally cooled at room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0019] The aging treatment temperature is 120-180°C and the aging time is 5-9h.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) High entropy alloy AlFeCrCoCu was added to optimize the alloy composition and thus improve the strength;

[0022] (2) Using equal channel angular extrusion deformation can refine the alloy grains, forming ultrafine grains or even nanocrystals, which can improve the tensile strength;

[0023] (3) Using low-temperature rolling deformation can not only refine the grains, but also effectively inhibit dynamic recovery and grain growth in a low-temperature environment, which can better improve the tensile strength, and the deformation amount each time is controlled at 5-10%, making the deformation more uniform;

[0024] (4) Aging treatment can be used to control the morphology of the strengthening phase Mg2Si during precipitation, achieving the optimal combination of tensile strength and electrical conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention and the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0029] (1) Smelting: according to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.2%, the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are smelted except the high entropy alloy AlFeCrCoCu at a smelting temperature of 760° C. to obtain aluminum liquid;

[0030] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 760° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 20 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0031] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0032] (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched;

[0033] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times;

[0034] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-200°C) with a reduction of 90% and a deformation of 5-10% each time;

[0035] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 150° C. for 7 h, and then air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0036] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 386MPa and a conductivity of 58.14%IACS.

[0037] Example 2

[0038] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0039] (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.4%, Si: 0.2%, AlFeCrCoCu: 0.1%, and the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are melted except the high entropy alloy AlFeCrCoCu at a melting temperature of 750° C. to obtain aluminum liquid;

[0040] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 750° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 1 hour. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 10 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0041] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0042] (4) Solution treatment: The ingot obtained in step (3) is solution treated (510° C., 3 h) and water quenched;

[0043] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times;

[0044] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-100°C) with a reduction of 70% and a deformation of 5-10% each time;

[0045] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 120° C. for 9 h, and air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0046] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 338MPa and a conductivity of 57.47%IACS.

[0047] Example 3

[0048] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0049] (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.2%, and the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are melted except the high entropy alloy AlFeCrCoCu at a melting temperature of 780° C. to obtain aluminum liquid;

[0050] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 780° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 3 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 10 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0051] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0052] (4) Solution treatment: The ingot obtained in step (3) is solution treated (550° C., 1 h) and water quenched;

[0053] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times;

[0054] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-50°C) with a reduction of 50% and a deformation of 5-10% each time;

[0055] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 180° C. for 5 h, and then air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0056] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 303MPa and a conductivity of 56.62%IACS.

[0057] Example 4

[0058] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0059] (1) Smelting: According to the following alloy element composition by mass percentage: Mg: 0.8%, Si: 0.6%, AlFeCrCoCu: 0.3%, the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are smelted at a smelting temperature of 760° C. to obtain aluminum liquid;

[0060] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 760° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 10 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0061] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0062] (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched;

[0063] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded twice;

[0064] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-100°C) with a reduction of 90% and a deformation of 5-10% each time;

[0065] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 150° C. for 7 h, and then air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0066] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 333MPa and a conductivity of 57.18%IACS.

[0067] Example 5

[0068] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0069] (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.1%, and the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are melted except the high entropy alloy AlFeCrCoCu at a melting temperature of 760° C. to obtain aluminum liquid;

[0070] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 760° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 20 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0071] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0072] (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched;

[0073] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times;

[0074] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-200°C) with a reduction of 90% and a deformation of 5-10% each time;

[0075] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 150° C. for 7 h, and then air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0076] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 371MPa and a conductivity of 57.84%IACS.

[0077] Example 6

[0078] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0079] (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.4%, Si: 0.2%, AlFeCrCoCu: 0.1%, and the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are melted except the high entropy alloy AlFeCrCoCu at a melting temperature of 750° C. to obtain aluminum liquid;

[0080] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 750° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 1 hour. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 10 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0081] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0082] (4) Solution treatment: The ingot obtained in step (3) is subjected to solution treatment (510° C., 3 h) and water quenching;

[0083] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded twice;

[0084] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-100°C) with a reduction of 70% and a deformation of 5-10% each time;

[0085] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 120° C. for 9 h, and air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0086] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 293MPa and a conductivity of 56.71%IACS.

[0087] Example 7

[0088] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0089] (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.2%, and the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are melted except the high entropy alloy AlFeCrCoCu at a melting temperature of 780° C. to obtain aluminum liquid;

[0090] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 780° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 3 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 10 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0091] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0092] (4) Solution treatment: The ingot obtained in step (3) is solution treated (550° C., 1 h) and water quenched;

[0093] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times;

[0094] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-50°C) with a reduction of 70% and a deformation of 5-10% each time;

[0095] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 180° C. for 5 h, and then air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0096] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 320MPa and a conductivity of 56.97%IACS.

[0097] Example 8

[0098] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0099] (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.2%, and the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are melted except the high entropy alloy AlFeCrCoCu at a melting temperature of 750° C. to obtain aluminum liquid;

[0100] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 750° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 20 minutes. The slag is removed and the temperature is kept warm in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0101] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0102] (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched;

[0103] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times;

[0104] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-200°C) with a reduction of 90% and a deformation of 5-10% each time;

[0105] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 150° C. for 7 h, and then air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0106] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 381MPa and a conductivity of 58.03%IACS.

[0107] Example 9

[0108] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0109] (1) Smelting: According to the following alloy element composition by mass percentage: Mg: 0.8%, Si: 0.6%, AlFeCrCoCu: 0.3%, the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are smelted except the high entropy alloy AlFeCrCoCu at a smelting temperature of 760° C. to obtain aluminum liquid;

[0110] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 760° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 10 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0111] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0112] (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched;

[0113] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded twice;

[0114] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-100°C) with a reduction of 90% and a deformation of 5-10% each time;

[0115] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 180° C. for 7 h and air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0116] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 324MPa and a conductivity of 57.36%IACS.

[0117] Example 10

[0118] The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps:

[0119] (1) Smelting: according to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.3%, the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are smelted except the high entropy alloy AlFeCrCoCu at a smelting temperature of 760° C. to obtain aluminum liquid;

[0120] (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 760° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 20 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm.

[0121] (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm;

[0122] (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched;

[0123] (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times;

[0124] (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-200°C) with a reduction of 90% and a deformation of 5-10% each time;

[0125] (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 150° C. for 7 h, and then air-cooled to room temperature to obtain a high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu.

[0126] After testing, the prepared high-strength and high-conductivity Al-Mg-Si alloy plate containing AlFeCrCoCu has a tensile strength of 377MPa and a conductivity of 57.98%IACS.

[0127] Table 1

[0128]

[0129] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu, characterized in that: There are two preparation methods; Preparation method 1 is as follows: The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps: (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.2%, the balance is Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials respectively, except for high entropy alloy AlFeCrCoCu, the raw materials containing the above elements are smelted at a smelting temperature of 760°C to obtain aluminum liquid; (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 760° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 20 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm. (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm; (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched; (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times; (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-200°C) with a reduction of 90% and a deformation of 5-10% each time; (7) Aging treatment: the aluminum alloy plate obtained in step (6) is kept at 150° C. for 7 h, and then air-cooled to room temperature to obtain the aluminum alloy plate; Preparation method 2 is as follows: The preparation method of the high-strength and high-conductivity Al-Mg-Si alloy containing AlFeCrCoCu has the following steps: (1) Melting: According to the following alloy element composition by mass percentage: Mg: 0.6%, Si: 0.4%, AlFeCrCoCu: 0.2%, and the balance being Al and other inevitable impurity elements, 99.85% aluminum ingot, Al-Mg master alloy, Al-Si master alloy and high entropy alloy AlFeCrCoCu are weighed as raw materials, and the raw materials containing the above elements are melted except the high entropy alloy AlFeCrCoCu at a melting temperature of 750° C. to obtain aluminum liquid; (2) Degassing, slag removal and casting: The temperature of the aluminum liquid obtained in step (1) is maintained at 750° C., a high entropy alloy AlFeCrCoCu is added, and the temperature is kept for 2 hours. Chlorine and argon are introduced into the liquid to remove the gas in the melt, and the slag is removed and kept warm for 20 minutes. The liquid is then cast in an oxygen-free environment to obtain an ingot with a diameter of 80 mm. (3) Sawing and milling: sawing and lathing the ingot obtained in step (2) to obtain an ingot with a size of 12*12*80 mm; (4) Solution treatment: The ingot obtained in step (3) is solution treated (530° C., 2 h) and water quenched; (5) Equal channel angular extrusion deformation: the ingot obtained in step (4) is extruded 4 times; (6) Low temperature rolling deformation: the aluminum alloy obtained in step (5) is rolled at a low temperature (-200°C) with a reduction of 90% and a deformation of 5-10% each time; (7) Aging treatment: The aluminum alloy plate obtained in step (6) is kept at 150° C. for 7 h, and then air-cooled to room temperature.

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