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Silicon-containing heat-resistant rare earth magnesium alloy and preparation method thereof

A rare earth magnesium and alloy technology is applied in the field of magnesium alloys and their preparation, silicon-containing heat-resistant rare earth magnesium alloys and their preparation fields, and can solve the problems of poor plasticity and other properties, increased cost, and high rare earth composition, and achieves improved wear resistance. properties, improving the strength of the alloy, and the effect of low rare earth content

Active Publication Date: 2013-09-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rare earth content in this patent is relatively high and not optimized. On the one hand, it brings about an increase in cost; , Si element is only added together with Mn in a very small amount, not as a special strengthening element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment relates to a silicon-containing heat-resistant rare earth magnesium alloy, which contains the following components by weight percentage:

[0036] 9%Gd, 2%Y, 0.5%Si and 0.35%Zr, the rest is Mg and unavoidable impurities (less than 0.02% by weight). Among them, the content of impurity elements is: Fe<0.005%, Cu<0.005%, Ni<0.002%, Ca<0.01%.

[0037] This embodiment also relates to the preparation method of the aforementioned silicon-containing heat-resistant rare earth magnesium alloy. The method includes: raw material preheating, smelting and subsequent heat treatment:

[0038] Step 1, raw material preheating: preheating the raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy to 200°C;

[0039] Step 2, Smelt: In SF 6 and CO 2 Mixed gas (SF 6 The volume percentage is 0.2%) under protection, including the following steps: (1) adding magnesium: adding pure magnesium to the resistance crucible furnace for smelting; (2) adding Si: after ...

Embodiment 2

[0043] This embodiment relates to a silicon-containing heat-resistant rare earth magnesium alloy, which contains the following components by weight percentage: 8% Gd, 3% Y, 1% Si and 0.6% Zr, and the rest is Mg and unavoidable impurities (weight percentage is less than 0.02%), wherein the content of impurity elements is: Fe<0.005%, Cu<0.005%, Ni<0.002%, Ca<0.01%.

[0044] This embodiment also relates to the preparation method of the aforementioned silicon-containing heat-resistant rare earth magnesium alloy. The method includes: the method includes: raw material preheating, smelting and subsequent heat treatment:

[0045] Step 1, raw material preheating: preheat raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy to 220°C;

[0046] Step 2, Smelt: In SF 6 and CO 2 Mixed gas (SF 6 The volume percentage is 0.2%) under protection, including the following steps: (1) adding magnesium: adding pure magnesium to the resistance crucible furnace for smelting; (2) a...

Embodiment 3

[0050] This embodiment relates to a silicon-containing heat-resistant rare earth magnesium alloy, which contains the following components by weight percentage: 10% Gd, 3% Y, 2% Si and 0.5% Zr, and the rest is Mg and unavoidable impurities (weight percentage is less than 0.02%), wherein the content of impurity elements is: Fe<0.005%, Cu<0.005%, Ni<0.002%, Ca<0.01%.

[0051] This embodiment also relates to the preparation method of the aforementioned silicon-containing heat-resistant rare earth magnesium alloy. The method includes: the method includes: raw material preheating, smelting and subsequent heat treatment:

[0052] Step 1, raw material preheating: preheat raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy to 210°C;

[0053] Step 2, Smelt: In SF 6 and CO 2 Mixed gas (SF 6 The volume percentage is 0.2%) under protection, including the following steps: (1) adding magnesium: adding pure magnesium to the resistance crucible furnace for smelting; (2) ...

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Abstract

The invention discloses a silicon-containing heat-resistant rare earth magnesium alloy and a preparation method thereof, wherein the alloy comprises the following components by weight percentage: 5-10% of Gd, 2-8% of Y, 0.3-2% of Si, 0.35-0.8% of Zr, 1-13% of Gd+Y1, less than 0.02% of impurities and the balance of magnesium. The invention also relates to a preparation method of the silicon-containing heat-resistant rare earth magnesium alloy; and the method comprises the steps of raw material preheating, smelting and subsequent heat treatment, wherein the smelting is carried out under protection of the mixed gases of SF6 and CO2; and the subsequent heat treatment comprises solid-solution treatment and aging treatment on the silicon-containing heat-resistant rare earth magnesium alloy. The preparation method of the silicon-containing heat-resistant rare earth magnesium alloy is simple in process, low in content of rare earth, and capable of guaranteeing excellent plasticity while improving the strength of the alloy; and a high-strength high-tenacity heat-resistant wearable magnesium alloy can be obtained by adjusting the constituents of the alloy and the heat treatment process; besides, the obtained magnesium alloy can be applied to a plurality of fields of automobile, aerospace, war industry and the like, and thereby is capable of meeting the requirements of a plurality of application occasions.

Description

technical field [0001] The invention relates to a magnesium alloy in the field of metal structural materials and a preparation method thereof, in particular to a silicon-containing heat-resistant rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest metal structure material currently used. It has high specific strength, specific stiffness, good thermal conductivity, electrical conductivity and electromagnetic shielding performance. It has a wide range of applications in the fields of automobiles, electronics, home appliances, communications, instruments, and aerospace. prospect. In particular, it can meet the requirements of the automotive industry in terms of light weight, low energy consumption, and high environmental protection, so it has received extensive attention. However, the defects of low strength and poor plasticity of common magnesium alloys at high temperature restrict their application in eng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
Inventor 汪欢王渠东杨俊
Owner SHANGHAI JIAO TONG UNIV
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