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A kind of mg-al-ca-ce series magnesium alloy and preparation method thereof

A mg-al-ca-ce, magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of low absolute strength and yield ratio, low alloy tension-compression symmetry, increase alloy cost, etc., and achieve excellent extrusion deformation performance. , the effect of high tension and compression symmetry, increasing the cost of the alloy

Active Publication Date: 2019-12-10
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AZ and AM series alloys are cheap, but their absolute strength and yield ratio are low, and their applications are limited; ZK series alloys such as ZK60 have a yield strength of 240-250MPa after extrusion and a tensile strength of 325-340MPa. The ratio is between 10 and 12%, but generally has a strong deformation texture, and the tension and compression symmetry of the alloy is low
Studies have shown that the addition of rare earth element Ce can stimulate non-basal slip, thereby achieving the purpose of weakening the deformation texture and improving the performance of the alloy. However, when only adding rare earth elements to weaken the texture, if significant effects are to be obtained, The required rare earth content is often relatively high, thus greatly increasing the cost of the alloy

Method used

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  • A kind of mg-al-ca-ce series magnesium alloy and preparation method thereof
  • A kind of mg-al-ca-ce series magnesium alloy and preparation method thereof
  • A kind of mg-al-ca-ce series magnesium alloy and preparation method thereof

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Effect test

Embodiment 1

[0038] The composition (mass percentage) of the Mg-Al-Ca-Ce series magnesium alloy is: Al is 4.0%, Ca is 3.5%, Ce is 0.5%, and the rest is magnesium and unavoidable impurities.

[0039] The preparation method of above-mentioned Mg-Al-Ca-Ce series magnesium alloy:

[0040] (1) Alloy smelting and casting: First, weigh industrial pure Mg, industrial pure Al, Mg-Ca, and Mg-Ce master alloys according to the composition requirements, put them into a resistance furnace, and preheat at 150°C for 30 minutes ; 2 and SF 6 Heat pure Mg in a resistance furnace protected by mixed gas, keep it warm at 680°C to melt the pure Mg, then add the preheated pure Al, Mg-Ca, Mg-Ce master alloy, heat it up to 700°C and keep it for 30 minutes, wait for The alloying elements are completely melted, stirred evenly, and the surface scum is removed, and the temperature is lowered to 690-700°C after standing for 20 minutes. 2 and SF 6 Cast into ingots under the protection of mixed gas; CO 2 and SF 6 In...

Embodiment 2

[0044] The composition (mass percentage) of the Mg-Al-Ca-Ce series magnesium alloy is: Al is 4.5%, Ca is 3.0%, Ce is 1.0%, and the rest is magnesium and unavoidable impurities.

[0045] The preparation method of above-mentioned Mg-Al-Ca-Ce series magnesium alloy:

[0046] (1) Alloy smelting and casting: First, weigh industrial pure Mg, industrial pure Al, Mg-Ca, and Mg-Ce master alloys according to the composition requirements, put them into a resistance furnace, and preheat at 150°C for 30 minutes ; 2 and SF 6 Heat pure Mg in a resistance furnace protected by mixed gas, keep it warm at 700°C to melt the pure Mg, then add the preheated pure Al, Mg-Ca, Mg-Ce master alloy, raise the temperature to 720°C and keep it for 25 minutes, wait The alloying elements are completely melted, stirred evenly, and the surface scum is removed, and the temperature is lowered to 690-700°C after standing for 20 minutes. 2 and SF 6 Cast into ingots under the protection of mixed gas; CO 2 and S...

Embodiment 3

[0050] The composition (percentage by mass) of the Mg-Al-Ca-Ce series magnesium alloy is: Al is 5.0%, Ca is 2.5%, Ce is 0.5%, and the rest is magnesium and unavoidable impurities.

[0051] The preparation method of above-mentioned Mg-Al-Ca-Ce series magnesium alloy:

[0052] (1) Alloy smelting and casting: First, weigh industrial pure Mg, industrial pure Al, Mg-Ca, and Mg-Ce master alloys according to the composition requirements, put them into a resistance furnace, and preheat at 150°C for 30 minutes ; 2 and SF 6 Heat pure Mg in a resistance furnace protected by mixed gas, keep it at 730°C to melt the pure Mg, then add the preheated pure Al, Mg-Ca, Mg-Ce master alloy, heat it up to 750°C and keep it for 30 minutes, wait The alloying elements are completely melted, stirred evenly, and the surface scum is removed, and the temperature is lowered to 690-700°C after standing for 20 minutes. 2 and SF 6 Cast into ingots under the protection of mixed gas; CO 2 and SF 6 In the m...

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Abstract

The invention discloses a Mg-Al-Ca-Ce-based magnesium alloy and a preparation method thereof, which is composed of the following components ordered in percentage by mass: 2.0-6.0 percent of Al, 1.0-4.0 percent of Ca, 0.2-2.0 percent of Ce, magnesium and some inevitable impurities. The magnesium alloy is obtained by melting and extrusion molding process, using an industrial pure magnesium ingot, anindustrial pure Al, and a Mg-Ce intermediate alloy as raw materials. The magnesium alloy of the invention can obtain extremely fine crystal grains and a dispersed second phase under the extruded condition. The tensile yield strength can reach 300 MPa, the compressive yield strength is 260 MPa, and the yield strength tensile compression ratio exceeds 85%. The tensile pressure is asymmetric and hasa high elongation, reaching over 14%, hereby has excellent extrusion deformation performance. It is a wrought magnesium alloy with excellent comprehensive mechanical properties.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to a Mg-Al-Ca-Ce series magnesium alloy with high strength and high tension-compression symmetry and a preparation method thereof. Background technique [0002] Magnesium alloy has the characteristics of light weight, high specific strength and specific stiffness, good casting performance, electromagnetic shielding and shock absorption performance, and has become the fastest growing metal material in today's industrial product applications. It has important application value and broad application prospects in the fields of aerospace, automobile, electronic products, national defense and military affairs. Compared with cast magnesium alloys, deformed magnesium alloys processed by extrusion, forging, rolling and other plastic forming methods have higher strength and better ductility, which can meet the needs of more diverse structural parts. However, due to the close-packed hexagonal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/00C22C23/02C22F1/002C22F1/06
Inventor 宋晓村赵东清刘玉孙翠翠王娜娜周吉学庄海华杨院生
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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