CN110396627B

CN110396627B - Rare earth aluminum alloy wire for 3D printing and preparation method thereof

Info

Publication number: CN110396627B
Application number: CN201910794611.0A
Authority: CN
Inventors: 闫建平; 李雄飞; 徐定能; 陈青松; 陈卫平
Original assignee: Hunan Oriental Scandium Co ltd
Current assignee: Hunan Oriental Scandium Co ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2021-05-14
Anticipated expiration: 2039-08-27
Also published as: CN110396627A

Abstract

The invention relates to a rare earth aluminum alloy wire for 3D printing and a preparation method thereof, wherein the rare earth aluminum alloy wire comprises 3-5wt% of Mg, 0.4-1.2wt% of RE, 0.1-1.0wt% of Zr, 0.1-1.0wt% of Mn, 0.05-0.25wt% of Ti, less than or equal to 0.05wt% of O, less than or equal to 0.02wt% of N, less than or equal to 0.01wt% of H, and the balance of Al and inevitable impurities; wherein the ratio of the Mn content to the RE content is 0.5-1: 1, the ratio of the Zr content to the RE content is 0.2-1: 1. the invention adds rare earth and zirconium elements on the basis of the components of the aluminum-magnesium alloy, refines crystal grains and generates Al simultaneously₃The (REZr) precipitation strengthening is used for feeding wires on a 3D printer smoothly, is not easy to break, has high strength and ensures the printing precision of products; the printed part has high density, good mechanical property and corrosion resistance.

Description

Rare earth aluminum alloy wire for 3D printing and preparation method thereof

Technical Field

The invention relates to a rare earth aluminum alloy wire for 3D printing and a preparation method thereof, belonging to the field of material preparation.

Background

3D printing is an advanced digital manufacturing technique that manufactures three-dimensional solid parts by layer-by-layer build-up. The laser 3D printing technology is used as a research hotspot of 3D printing, has the advantages of high material utilization rate, high processing flexibility, short processing period, no limitation of the geometric shape of parts and the like, is particularly suitable for manufacturing parts with small batch and complex shapes, and has wide application prospects in the fields of aerospace, medical treatment, automobiles, ships, nuclear power and the like.

The additive manufacturing of the metal material can be divided into two process modes of powder feeding/powder laying and wire feeding, wherein the additive manufacturing forming precision based on the metal powderThe method is high, is suitable for processing small components with complex shapes, but has low material utilization rate, causes certain pollution to the environment by powder, and has the problem of higher requirement on the operating environment; at present, the aluminum alloy printing material at home and abroad mainly takes a powder material as a main component and mainly comprises AlSi₁₀Mg and AlSi₁₂Two, there is a printed article of low strength (σ)_b<350Mpa), small molding size and the like. Compared with the prior art, the wire feeding additive manufacturing method has the advantages of high material utilization rate, no pollution, more economy and practicability, suitability for processing large-size components, and complementation with the powder additive manufacturing technology.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the rare earth aluminum alloy wire for 3D printing and the preparation method thereof.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a rare earth aluminum alloy wire for 3D printing is disclosed, the diameter of the rare earth aluminum alloy wire is 0.5-2mm, the tensile strength is greater than 320MPa, the yield strength is greater than 350-; in the rare earth aluminum alloy wire, the content of Mg is 3-5wt%, the content of RE is 0.4-1.2wt%, the content of Zr is 0.1-1.0wt%, the content of Mn is 0.1-1.0wt%, the content of Ti is 0.05-0.25wt%, the content of O is less than or equal to 0.05wt%, the content of N is less than or equal to 0.02wt%, the content of H is less than or equal to 0.01wt%, and the balance is Al and inevitable impurities; wherein the ratio of the Mn content to the RE content is 0.5-1: 1, the ratio of the Zr content to the RE content is 0.2-1: 1.

mn in the alloy is partially dissolved in matrix Al in a solid solution mode, and the balance is MnAl₆The form of the phase is present in the tissue. Mn can improve the recrystallization temperature of the alloy, coarsen the structure crystal grains and improve the alloy strength, and meanwhile, the addition of Mn can reduce the solubility of Mg in a matrix, reduce the crack tendency in printing and improve the strength of a 3D printed piece and a welding wire.

Al can be formed by adding Zr in rare earth aluminum alloy₃(RE, Zr) particles effective for improving alloyPerformance, in comparison with Al₃RE and Al₃Zr particles, Al₃The (RE, Zr) particles have better strengthening effect and stability.

Further, in the rare earth aluminum alloy wire, the content of Mg is 3-5wt%, the content of RE is 0.4-1.2wt%, the content of Zr is 0.08-1.2 wt%, the content of Mn is 0.2-1.2 wt%, the content of Ti is 0.05-0.25wt%, the content of O is less than or equal to 0.05wt%, the content of N is less than or equal to 0.02wt%, the content of H is less than or equal to 0.01wt%, and the balance of Al and inevitable impurities

Further, RE is one or more of Er, Yb, Y, Sc, Tb, Ce and Sm. Preferably, the RE is one or more of Er, Y and Sc.

Preferably, the Mn content is 0.3 to 0.7 wt%.

Preferably, the Mg content is 4 to 5 wt%.

Preferably, the RE content is 0.4 to 1.0 wt%.

Preferably, the Zr content is 0.1 to 0.5 wt%.

Furthermore, RE is Sc, and the content of Sc is between 0.6 and 0.7 weight percent.

Furthermore, RE is Er, and the content of Er is between 0.65 and 0.7 weight percent.

Further, RE is Y, and the content of Y is between 0.65 and 0.75 weight percent.

Preferably, the content ratio of Zr to RE is between 0.3 and 0.6.

Preferably, when RE is Sc, the mass content ratio of Zr to Sc is between 0.4 and 0.6.

Preferably, when RE is Er, the mass content ratio of Zr to Er is between 0.2 and 0.4.

Preferably, when RE is Y, the mass content ratio of Zr to Y is between 0.2 and 0.4.

Preferably, the O content is less than 0.03 wt%.

Preferably, the N content is less than 0.015 wt%.

Preferably, the H content is less than 0.008 wt%.

Further, the content of N is less than or equal to 0.01 wt%.

Further, the H content is less than or equal to 0.005 wt%.

Furthermore, the total impurity content is less than or equal to 0.05wt%, and the single impurity content is less than or equal to 0.02 wt%.

Furthermore, the total impurity content is less than 0.05wt%, and the single impurity content is less than 0.02 wt%.

The preparation method of the rare earth aluminum alloy wire is characterized by comprising the following steps:

s1, mixing pure aluminum, pure magnesium, an Al-Mn intermediate alloy, an Al-Zr intermediate alloy, an Al-Ti intermediate alloy and an Al-RE intermediate alloy to obtain a raw material mixture;

s2, smelting the raw material mixture obtained in the step S1 in vacuum or protective atmosphere, and then casting to obtain an alloy ingot;

s3, carrying out homogenizing annealing on the alloy ingot obtained in the step S2, and then carrying out hot extrusion to obtain an alloy rod;

s4, performing wire drawing treatment on the alloy rod obtained in the step S3 to obtain the rare earth aluminum alloy wire with the diameter of 0.5-2 mm.

Further, the purities of Al and Mg in S1 are both more than 99.5 wt%.

Further, in S2, the melting temperature is 760-800 ℃, and the casting temperature is 720-760 ℃.

Further, in S2, the melting is performed in a vacuum induction furnace.

Further, in S3, the homogenization annealing temperature is 320-550 ℃. Optionally, the homogenizing annealing time is 8-14 h.

Further, in S3, the hot extrusion temperature was 450-550 ℃.

Preferably, when the added rare earth element (RE) is Sc, the temperature of the homogenizing annealing is 320-400 ℃.

Preferably, when the added rare earth element is Er, the temperature of the homogenizing annealing is 420-500 ℃.

Preferably, when the added rare earth element is Y, the temperature of the homogenizing annealing is 420-500 ℃.

Compared with the prior art, the invention has the following beneficial effects:

(1) the inventor optimizes the mechanical property of the rare earth aluminum alloy by regulating and controlling the element proportion and the content ratio of Zr, Mn and RE through repeated tests, so that the millimeter-scale rare earth aluminum alloy wire can be smoothly manufactured, the obtained rare earth aluminum alloy wire is not easy to break, and the smooth wire feeding in the 3D printing process can be ensured.

(2) Vacuum melting is adopted, so that oxidation and slag inclusion are avoided;

(3) the rare earth and zirconium elements are introduced into the components of the aluminum-magnesium alloy, so that grains are refined, and Al is generated at the same time₃(REZr) precipitation strengthening, the tensile strength of the printed product reaches sigma_b450MPa or more; the performance is superior to that of AlSi₁₀Mg, good printing formability;

(4) because of introducing rare earth and zirconium element, the crystal grain is refined and Al is generated at the same time₃The (REZr) precipitation strengthening is realized, the wire strength and the processing performance are improved, the brittleness of the material is reduced by controlling impurity elements, the wire drawing and the wire feeding are not easy to break, the wire feeding speed is stable in the printing process, the fluidity is good, the strength is high, the forming speed is stable, the wire breaking and strand flowing down are avoided, and the forming precision and the appearance effect of the handicraft printing are ensured; the printed part has high density, good mechanical property and corrosion resistance.

(5) All steps of the adopted production process are industrial mature procedures, and the process flow is simple, thereby being beneficial to reducing the production cost.

Drawings

FIG. 1 is an enlarged view of the rare earth aluminum alloy wire obtained in example 1.

FIG. 2 is an enlarged view of the rare earth aluminum alloy wire obtained in example 6.

FIG. 3 is an enlarged view of the appearance of the rare earth aluminum alloy wire obtained in comparative example 1.

Detailed Description

The technical solution of the present invention is further specifically described below by specific implementation examples, but the present invention is not limited to these implementation examples.

Example 1

A preparation method of a rare earth aluminum alloy wire for 3D printing is carried out according to the following steps:

(1) smelting raw materials: in a vacuum furnace, the smelting composition is Al-4%Mg-0.3% Mn-0.7% Er-0.3% Zr-0.05% Ti, Fe < 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-10% Er, Al-4% Zr, Al-20% Mn and Al-5% Ti, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa. (Each percentage is a mass percentage)

(2) And (3) carrying out homogenizing annealing at 480 ℃/12h on the cast ingot in the step (1), cutting the skin, and removing the head.

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b356Mpa, yield strength σ_0.2325 Mpa; the microscopic appearance of the wire is shown in FIG. 1.

(4) And (4) printing the wire material in the step (3) by adopting laser fuse 3D printing equipment to obtain a sample, and processing the sample into a test piece after heat treatment. The mechanical property test is carried out according to the GB/T228-_b450MPa, yield strength sigma_0.2420Mpa, and an elongation η of 9%.

Example 2

(1) Smelting raw materials: in a vacuum furnace, the smelting components are Al-5 percent of Mg-0.3 percent of Mn-0.4 percent of Sc-0.2 percent of Zr, the Fe is controlled to be less than 0.1 percent, and Si is controlled to be less than 0.1 percent<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa. (Each percentage is a mass percentage)

(2) And (2) carrying out homogenizing annealing on the cast ingot in the step (1) at 350 ℃/10h, cutting the skin, and removing the head.

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b347Mpa, yield strength σ_0.2312Mpa, elongation 9%.

(4) Will carry out the stepsAnd (4) printing the sample by the silk material in the step (3) by adopting laser fuse wire 3D printing equipment, and processing the sample into a test piece after heat treatment. The mechanical property test is carried out according to the GB/T228-_b457MPa, yield strength sigma_0.2415MPa, elongation 10%.

Example 3

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-0.5% Sc-0.25% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b414Mpa, yield strength σ_0.2382Mpa, elongation 12%.

(4) And (4) printing the wire material in the step (3) by adopting laser fuse 3D printing equipment to obtain a sample, and processing the sample into a test piece after heat treatment. The mechanical property test is carried out according to the GB/T228-_b492Mpa, yield strength σ_0.2458Mpa, elongation 11%.

Example 4

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-0.6% Sc-0.3% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, and roughly drawingAfter the wire is subjected to intermediate drawing, annealing and fine drawing, the wire with the diameter of 1.2mm is obtained by peeling, the mechanical property test is carried out according to the GB/T228-_b470Mpa, yield strength σ_0.2431MPa, elongation 13%.

(4) And (4) printing the wire material in the step (3) by adopting laser fuse 3D printing equipment to obtain a sample, and processing the sample into a test piece after heat treatment. The mechanical property test is carried out according to the GB/T228-_b513Mpa, yield strength σ_0.2461Mpa, elongation 14%.

Example 5

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-0.7% Sc-0.35% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b512Mpa, yield strength sigma_0.2467MPa, elongation 14%.

(4) And (4) printing the wire material in the step (3) by adopting laser fuse 3D printing equipment to obtain a sample, and processing the sample into a test piece after heat treatment. The mechanical property test is carried out according to the GB/T228-.

Example 6

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-1% Sc-0.5% Zr to control Fe to be less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, wherein the raw materials are pure Al, pure Mg, Al-2% Sc, Al-4% Zr and Al-20% Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35×10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b476Mpa, yield strength σ_0.2445MPa, elongation 9%, the microscopic appearance of the wire is shown in FIG. 2.

Example 7

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-1.1% Sc-0.55% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b450MPa, yield strength sigma_0.2419MPa, elongation 9%.

Example 8

(1) Smelting raw materials: in a vacuum furnace, smelting intoAl-5% Mg-0.3% Mn-1.2% Sc-0.6% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b448MPa, yield strength sigma_0.2407Mpa, elongation 8%.

Comparative example 1

(1) Smelting raw materials: smelting an alloy ingot with the components of Al-5% of Mg-0.3% of Mn-0.1% of Sc-0.1% of Zr in a vacuum furnace, wherein the raw materials are selected from 99% of Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Detecting the cast ingot in the step (1) by using ICP (inductively coupled plasma), wherein the Si content is 0.27 percent, and the Fe content is 0.36 percent

(4) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b273MPa, yield strength sigma_0.2The microscopic appearance of the wire, 240MPa, is shown in FIG. 3. Compared with examples 1 and 2, the comparative sample wire has more holes on the surface, lower strength and wire drawing processThe phenomenon of severe wire breakage exists in the process, and the wire feeding is not smooth due to poor surface quality of the wire material, so that the method cannot be used for 3D printing.

Comparative example 2

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-0.2% Sc-0.1% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b296MPa, yield strength sigma_0.2267Mpa, elongation 9%.

Comparative example 3

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-0.3% Sc-0.15% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b＝323Mpa，Yield strength sigma_0.2298MPa, elongation 10%.

Comparative example 4

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-1.3% Sc-0.65% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Continuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b439MPa, yield strength sigma_0.2398Mpa, elongation 6%.

Comparative example 5

(1) Smelting raw materials: in a vacuum furnace, smelting components are Al-5% Mg-0.3% Mn-1.4% Sc-0.7% Zr to control Fe less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005% of alloy ingot, the raw materials of which are pure Al, pure Mg, Al-2% of Sc, Al-4% of Zr and Al-20% of Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa。

(3) Will carry out the stepsContinuously extruding the cast ingot in the step (2) at 500 ℃, carrying out rough drawing, middle drawing, annealing and fine drawing, peeling to obtain a wire with the diameter of 1.2mm, and carrying out mechanical property test according to the GB/T228-_b421MPa, yield strength sigma_0.2382Mpa, elongation 6%.

(4) And (4) printing the wire material in the step (3) by adopting laser fuse 3D printing equipment to obtain a sample, and processing the sample into a test piece after heat treatment. The mechanical property test is carried out according to the GB/T228-_b587MPa, yield strength sigma_0.2561MPa, elongation 9%.

According to the above examples and comparative examples, the contents of Mg and Mn elements and the Sc/Zr ratio are fixed, the addition amount of Sc has important influence on the mechanical properties of the wire and the printed sample (Table 1), and the tensile strength, yield strength and elongation of the wire and the 3D printed sample are remarkably improved along with the increase of the addition amounts of Sc and Zr; the mechanical properties of the wire were reduced after the Sc content reached 1%, probably due to the large amount of coarse Al3(Sc, Zr) segregants in the wire due to the high concentration of Sc, Zr that could not be completely dissolved in the Al matrix during melting.

TABLE 1 comparison of mechanical properties of wire and printed sample under different addition amounts of Sc and Zr

The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.

Claims

1. A rare earth aluminum alloy wire for 3D printing is characterized by comprising the following steps:

(1) smelting raw materials: smelting an alloy ingot in a vacuum furnace,the raw materials are pure Al, pure Mg, Al-2% Sc, Al-4% Zr and Al-20% Mn, the smelting temperature is 780 ℃, the casting temperature is 760 ℃, and the vacuum degree is 1.35 multiplied by 10^-3Pa；

(2) Carrying out homogenizing annealing on the cast ingot in the step (1) at 350 ℃ for 10h, then cutting the skin and removing the head;

(3) continuously extruding the cast ingot in the step (2) at 500 ℃, and peeling to obtain a wire material with the diameter of 1.2mm after rough drawing, intermediate drawing, annealing and fine drawing;

wherein the alloy ingot comprises Al-5% Mg-0.3% Mn-1.1% Sc-0.55% Zr or Al-5% Mg-0.3% Mn-1.2% Sc-0.6% Zr, Fe is controlled to be less than 0.1%, Si<0.1％，O<0.03％，N<0.01％，H<0.005 percent; according to the GB/T228-_b450MPa, yield strength sigma_0.2419MPa, and elongation of 9%; when the composition of the alloy ingot is Al-5% Mg-0.3% Mn-1.2% Sc-0.6% Zr, the tensile strength sigma of the wire is_b448MPa, yield strength sigma_0.2407MPa, and an elongation of 8%.