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High-strength heat-resisting magnesium alloy suitable for sand casting and preparation method thereof

A technology of sand casting and magnesium alloy, which is applied in the fields of magnesium alloy and its preparation, high-strength heat-resistant magnesium alloy and its preparation, can solve the problems of rare metal Zr waste, increase the cost of alloy casting, uneven composition, etc., and achieve the purpose of suppressing grains The effect of growth, small element segregation, and slowing down of atomic diffusion

Active Publication Date: 2015-09-23
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of adding Zr in the form of Mg–Zr master alloy still has problems such as high alloy impurities, uneven composition, specific gravity segregation, and serious Zr loss.
The existence of the above problems leads to the waste of a large amount of rare metal Zr in actual production, which increases the cost of alloy casting and becomes a bottleneck for obtaining a stable grain refinement effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment relates to a high-strength heat-resistant magnesium alloy suitable for sand casting. The components and mass percentages of the high-strength heat-resistant magnesium alloy suitable for sand casting are: 7wt.%Gd, 4wt.%Y, 0.5wt .%Ag, 0.2wt.%Zr, 0.3wt.%B, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg (wt.% means that the components account for the prepared The percentage of the total mass of the magnesium alloy, the total mass is Mg, Ag, K 2 ZrF 6 Mixed salt, B 2 o 3 And the quality of various master alloys and).

[0036] The preparation method of the magnesium alloy includes two parts: a smelting process and a heat treatment process.

[0037] The smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0038] (1) Material preparation: prepare Mg-20wt.% Gd master alloy containing 7wt.% Gd total weight of the formulated alloy, Mg-30wt.% Y maste...

Embodiment 2

[0049] This embodiment relates to a high-strength heat-resistant magnesium alloy suitable for sand casting. The components and mass percentages of the high-strength heat-resistant magnesium alloy suitable for sand casting are: 11wt.%Gd, 1wt.%Y, 2.5wt .%Ag, 0.6wt.%Zr, 0.1wt.%B, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0050] The preparation method of the magnesium alloy includes two parts: a smelting process and a heat treatment process.

[0051] The smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0052] (1) Material preparation: prepare Mg–30wt.% Gd master alloy containing 11wt.% Gd total weight of the formulated alloy, Mg–20wt.% Y master alloy containing 1wt.% Y, K containing 0.6wt.% Zr 2 ZrF 6 Mixed salt, containing 0.1 wt.% B of B 2 o 3 , 2.5wt.% pure Ag, the balance is pure Mg;

[0053] (2) Baking material: pure Mg, pure Ag, Mg–Gd master alloy...

Embodiment 3

[0063] This embodiment relates to a high-strength heat-resistant magnesium alloy suitable for sand casting. The components and mass percentages of the high-strength heat-resistant magnesium alloy suitable for sand casting are: 9wt.%Gd, 2.5wt.%Y, 1.5 wt.%Ag, 0.4wt.%Zr, 0.2wt.%B, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0064] The preparation method of the magnesium alloy includes two parts: a smelting process and a heat treatment process.

[0065] The smelting process is in SF 6 and CO 2Under the condition of mixed gas protection, the steps are as follows:

[0066] (1) Preparation of materials: prepare Mg-25wt.% Gd master alloy containing 9wt.% Gd total weight of the prepared alloy, Mg-25wt.% Y master alloy containing 2.5wt.% Y, K containing 0.4wt.% Zr 2 ZrF 6 Mixed salt (50wt.%K 2 ZrF 6 –25wt.% NaCl–25wt.% KCl), B containing 0.2wt.% B 2 o 3 , 1.5wt.% pure Ag, the balance is pure Mg;

[0067] (2) Baking mat...

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Abstract

The invention discloses high-strength heat-resisting magnesium alloy suitable for sand casting and a preparation method thereof. The high-strength heat-resisting magnesium alloy suitable for sand casting comprises, by mass, 7-11% of Gd, 1-4% of Y, 0.5-2.5% of Ag, 0.2-0.6% of Zr, 0.1-0.3% of B, lower than 0.02% of impurity elements and the balance Mg, wherein the impurity elements include Si, Fe, Cu and Ni. The preparation method comprises the steps of smelting and heat treatment. The Gd and the Y are used as main alloy elements of the high-strength heat-resisting magnesium alloy, the Ag is added into the alloy to improve the solid solution strengthening effect of rare earth alloy and refine a precipitated phase, a K2ZrF6 salt mixture and B2O3 are added to inhibit grain growth of the alloy in sand casting and follow-up solid solution process, reduce segregation of the elements Zr and B, improve the yield of the elements Zr and B and reduce the production cost of the magnesium alloy.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a high-strength heat-resistant magnesium alloy suitable for sand casting and a preparation method thereof, belonging to the technical field of metal materials. Background technique [0002] Due to the special working environment of aviation, aerospace and weaponry, structural weight reduction and structural load-bearing and functional integration are important directions for their development. Magnesium alloys have low density, high specific strength and specific stiffness, excellent shock resistance and cutting performance. Good and other advantages, in the field of aerospace and national defense military industry has broad application prospects. However, most aerospace magnesium alloy parts are produced by sand casting due to their complex structure and large size. However, due to the slow cooling rate of sand casting, grain coarsening is very serious, and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03
Inventor 吴国华刘文才李艳磊丁文江周克华王少华闵昌万
Owner SHANGHAI JIAO TONG UNIV
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