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Magnesium-lithium alloy used for sand mold casting and preparing method of magnesium-lithium alloy

A magnesium-lithium alloy and sand casting technology, applied in the field of magnesium alloys and their preparation, can solve the problems of limited strength improvement of magnesium-lithium alloys, and achieve the effects of reducing shrinkage defects, high thermal stability and improving fluidity

Active Publication Date: 2016-11-23
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alloying elements commonly used in magnesium-lithium alloys include Al, Zn, Si, etc., but previous studies have shown that these elements have very limited improvement in the strength of magnesium-lithium alloys

Method used

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preparation example Construction

[0038] The invention also provides a preparation method of the magnesium-lithium alloy suitable for sand casting. The preparation method includes a smelting step and a heat treatment step.

[0039] The smelting step specifically adopts the following methods:

[0040] A1. Baking material: Weigh pure Mg, pure Al, pure Zn, Mg-Nd master alloy, Mg-Ce master alloy, Al-Ti master alloy, Al- For Ti–C master alloy and Li rod, preheat all the above raw materials at 180°C to 250°C for 3 hours respectively;

[0041] A2. Molten magnesium: add the dried pure Mg into a lithium salt protection flux and put it into a crucible resistance furnace to melt to form a magnesium liquid;

[0042] A3. Adding Al, Zn, Nd, Ce, Ti and C: When the temperature of the magnesium liquid reaches 690°C to 730°C, add pure Al to the magnesium liquid, and after the pure Al is melted, the melt When the temperature rises to 700°C-730°C, pure Zn is added. After the pure Zn is melted, when the melt temperature rises to...

Embodiment 1

[0055] This embodiment provides a magnesium-lithium alloy suitable for sand casting, its components and mass percentages are: 3wt.% Li, 7wt.% Al, 3.5wt.% Zn, 0.5wt.% Nd, 3wt.% Ce, 0.2wt.% Ti, 0.005wt.% C, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0056] The preparation method of the magnesium-lithium alloy includes two process steps of smelting and subsequent heat treatment.

[0057] Among them, the previous smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0058] (1) Baking material: Weigh pure Mg, pure Al, pure Zn, Mg-30Nd master alloy, Mg-30Ce master alloy, Al-5Ti master alloy, Al -5Ti-0.5C master alloy and Li rod, weigh lithium salt protective flux and 4% refining flux according to the mass of the prepared alloy, and then preheat all the above-mentioned raw materials at 180° C. for 3 hours; the lithium The salt protection flux is formed by mixing Li...

Embodiment 2

[0069]This embodiment provides a magnesium-lithium alloy suitable for sand casting, and its components and mass percentages are: 10wt.% Li, 2wt.% Al, 0.5wt.% Zn, 3wt.% Nd, 0.5wt.% Ce, 0.05wt.% Ti, 0.05wt.% C, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0070] The preparation method of the magnesium-lithium alloy includes two process steps of smelting and subsequent heat treatment.

[0071] Among them, the previous smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0072] (1) Baking material: Weigh pure Mg, pure Al, pure Zn, Mg-90Nd master alloy, Mg-20Ce master alloy, Al-2Ti master alloy, Al -2Ti-1C master alloy and Li rod, weigh lithium salt protective flux and 4% refining flux according to the mass of the prepared alloy, and then preheat all the above-mentioned raw materials at 250° C. for 3 hours; the lithium salt The protective flux is composed of LiCl ...

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Abstract

The invention provides a magnesium-lithium alloy used for sand mold casting and a preparing method of the magnesium-lithium alloy. The magnesium-lithium alloy comprises, by weight percent, 3%-10% of Li, 2%-7% of Al, 0.5%-3.5% of Zn, 0.5%-3% of Nd, 0.5%-3% of Ce, 0.05%-0.2% of Ti, 0.005%-0.05% of C and the balance Mg and inevitable impurities. The preparing method includes smelting and heat treatment. According to the magnesium-lithium alloy used for sand mold casting and the preparing method of the magnesium-lithium alloy, Li, Al and Zn serve as the main alloy elements and Nd, Ce, Ti and C are added, so that the solid solution strengthening effect of the magnesium-lithium alloy use for sand mold casting is improved, shrinkage porosity defects are reduced, the sand mold casting performance is improved, grain growth of the alloy in the sand mold casting process and the later solid solution process is inhibited, segregation of the Li element is reduced, and the yield of the Li element is increased. According to the magnesium-lithium alloy used for sand mold casting and the preparing method of the magnesium-lithium alloy, magnesium-lithium alloy grains are well refined on the premise that the alloy cost is not improved obviously, and the beneficial effects that the sand mold casting forming performance is good, the comprehensive mechanical performance is high, and the cost is low are achieved.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a magnesium-lithium alloy suitable for sand casting and a preparation method thereof. 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-lithium alloys have low density, high specific strength and specific stiffness, excellent shock resistance and cutting processing With good performance and other advantages, it has broad application prospects in the fields of aerospace and national defense military industries. However, most aerospace magnesium alloy parts are produced by low-pressure sand casting methods due to their complex structures and large sizes. Magnesium-lithium alloy low-pressure sand casting is a new technology combining advanced materials and advanced tec...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/02C22C1/03C22C1/06C22F1/06
CPCC22C1/03C22C1/06C22C23/00C22C23/02C22F1/06
Inventor 刘文才肖旅吴国华田莹邹文兵李中权丁文江
Owner SHANGHAI JIAO TONG UNIV
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