High-strength heat-resistant casting magnesium alloy material and preparation method thereof

A technology for casting magnesium alloys and magnesium alloys, which is used in the field of high-strength and heat-resistant casting magnesium alloy materials and their preparation, manufacturing, and large-scale complex thin-walled high-performance magnesium alloy castings, which can solve the problems that limit the application of heat-resistant magnesium alloy materials and cannot meet the High-end casting requirements and other issues, to achieve the effect of high yield, improved performance indicators, and excellent quality

Inactive Publication Date: 2018-03-30
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the average value of the tensile properties of the casting body at room temperature can reach R m =250MPa, R 0.2 =178MPa, A=3%, the average value of tensile properties at 250°C reaches R m =210MPa, R 0.2 =150MPa, A=12

Method used

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  • High-strength heat-resistant casting magnesium alloy material and preparation method thereof
  • High-strength heat-resistant casting magnesium alloy material and preparation method thereof
  • High-strength heat-resistant casting magnesium alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] Prepare 4kg of Mg-3.5Y-2Nd-2Gd-0.4Zn-0.6Zr(-0.2Ag) alloy.

[0038] First of all, according to the alloy smelting process, combined with the burning law of the elements, the batching is carried out.

[0039] Weigh 0.8kg of 25%Mg-Y master alloy, 0.34kg of 25%Mg-Nd master alloy, 0.36kg of 25%Mg-Gd master alloy, 0.016kg of Zn, 0.27kg of 30%Mg-Zr master alloy, and pure Ag0. 008kg, pure Mg2.21kg.

[0040] Clean the surface of all alloy raw materials to expose the metallic luster, and preheat to 200°C.

[0041] Secondly, preheat the crucible to 400℃, add pure Mg, use flux, SF 6 With CO 2 The method of combining mixed gas for protection, wherein the flux protection is used during smelting, the weight percentage is less than 3%, and 0.5-5Vol.% SF is mixed before pouring. 6 CO 2 Mixed gas for protection; at the same time, a special covering agent for magnesium alloy is added for smelting protection. Magnesium alloy covering agent is a kind of smelting assistant, mainly ...

Example Embodiment

[0050] Example 2

[0051] Prepare 40kg of Mg-4.5Y-2.5Nd-1.5Gd-0.2Zn-0.7Zr(-0.3Ag) alloy.

[0052] First of all, according to the alloy smelting process, combined with the burning law of the elements, the batching is carried out.

[0053] Weigh 30% Mg-Y master alloy 8.57 kg, 90% Mg-Nd master alloy 1.21 kg, 90% Mg-Gd master alloy 0.74 kg, pure Zn 0.08 kg, 30% Mg-Zr master alloy 3.11 kg, pure Ag0 .12kg, 26.18kg of pure Mg.

[0054] Clean the surface of all alloy raw materials to expose the metallic luster, and preheat to 200°C.

[0055] Secondly, preheat the crucible to 400℃, add pure Mg, use flux, SF 6 With CO 2 The method of combining mixed gases for protection, in which the flux protection is used during smelting, the weight percentage is less than 3%, and 0.5-5Vol.% SF is mixed before pouring. 6 CO 2 Mixed gas is used for protection; at the same time, magnesium alloy special covering agent is used for smelting protection. Magnesium alloy covering agent is a kind of smelting auxiliary,...

Example Embodiment

[0064] Example 3

[0065] Prepare 300kg of Mg-5.5Y-1.5Nd-3.5Gd-0.2Zn-0.5Zr (-0.5Ag) alloy.

[0066] First of all, according to the alloy smelting process, combined with the burning law of the elements, do the batching.

[0067] Weigh 78.6 kg of 30% Mg-Y master alloy, 15.8 kg of 30% Mg-Nd master alloy, 38.9 kg of 30% Mg-Gd master alloy, 0.6 kg of pure Zn, 16.7 kg of 30% Mg-Zr master alloy, and pure Ag1 .5kg, 147.9kg of pure Mg.

[0068] Clean the surface of all alloy raw materials to expose the metallic luster, and preheat to 200°C.

[0069] Secondly, preheat the crucible to 400℃, add pure Mg, use flux, SF 6 With CO 2 The method of combining mixed gases for protection, in which the flux protection is used during smelting, the weight percentage is less than 3%, and 0.5-5Vol.% SF is mixed before pouring. 6 CO 2 Mixed gas is used for protection; at the same time, magnesium alloy special covering agent is used for smelting protection. Magnesium alloy covering agent is a kind of smelting ass...

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Abstract

The invention relates to a high-strength heat-resistant casting magnesium alloy material and a preparation method thereof. The alloy is prepared from the components in percentage by weight: 3.5 to 6.5percent of Y, 1.5 to 3.5 percent of Nd, 1.5 to 4 percent of Gd, 0 to 0.5 percent of Zn, 0.2 to 0.7 percent of Zr, 0 to 0.5 percent of Ag, and the balance Mg. The preparation method comprises the steps of calculating and compounding; smelting; pouring; and carrying out heat treatment. The invention develops the novel high-strength heat-resistant casting magnesium alloy material suitable for manufacturing a high-performance complex thin-wall magnesium alloy casting aiming at the material technology problems of poor fluidity, large hot cracking tendency and severe segregation; a formula is scientific, and the process is reasonable; the prepared magnesium alloy has favorable heat resistance and a casting process performance while maintaining toughness; the manufactured casting has the characteristics of excellent quality, high yield and high process stability; and the material is lower in cost, can be used for researching and producing high-end light castings, has a broad application prospect, and is particularly suitable for the high-end fields such as weapons, spaceflight, aviation and other national defense industries and civil traffic.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and relates to a high-strength heat-resistant casting magnesium alloy material and a preparation method thereof, which is suitable for the preparation of magnesium alloy materials and the production of magnesium alloy ingots and castings, and is especially suitable for manufacturing medium and large complex thin Wall high-performance magnesium alloy castings. Background technique [0002] Magnesium alloy has low density, high specific strength, high specific stiffness, and has good antimagnetic, electronegativity, thermal conductivity, damping and shock absorption, and cutting performance. It has received more and more attention. It has been widely used in automobiles and 3C products be widely used. However, the shortcomings of insufficient strength and poor heat resistance have seriously hindered the development and application of magnesium alloy materials. Existing heat...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/02C22C1/03C22F1/06
CPCC22C1/02C22C1/03C22C23/06C22F1/06
Inventor 庞松任静徐永东朱秀荣任政刘辰王军王荣曾羽曹召勋
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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