Preparation method of semisolid slurry of rare earth magnesium alloy

A technology of semi-solid slurry and rare earth magnesium, which is applied in the field of semi-solid forming of metal materials to achieve the effect of improving efficiency and cost, shortening semi-solid processing process and reducing cost

Active Publication Date: 2014-05-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can solve the problem of oxidized inclusions caused by traditional external physical fields caused by melt agitation and air contact, and can also avoid the use of expensive magnesium-zirconium master alloys; and because the aluminum addition yield is stable and the composition is easy to control, it provides A low-cost preparation method of rare earth magnesium alloy semi-solid slurry, which provides a theoretical basis for semi-solid rheological deformation of rare earth magnesium alloy

Method used

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  • Preparation method of semisolid slurry of rare earth magnesium alloy
  • Preparation method of semisolid slurry of rare earth magnesium alloy
  • Preparation method of semisolid slurry of rare earth magnesium alloy

Examples

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Embodiment 1

[0054] This embodiment relates to a kind of rare earth magnesium alloy Mg-11wt.%Y-4wt.Gd%. The melting and refining process is as follows: all the tools in contact with the alloy melt are painted in advance, and the tools, charge, refining agent and sampling copper mold are all in the Dry at 180°C for more than 3 hours. Turn on the resistance furnace, preheat the stainless steel crucible to dark red, add magnesium ingots, and start feeding CO2+SF6 protective gas with a volume ratio of 100:1 at 300°C until the casting work is completed. Raise the temperature of the crucible resistance furnace to 700°C until the pure magnesium is completely melted, and then adjust the temperature to 720°C-750°C. The magnesium in the alloy smelting base material with this composition is pure magnesium with a purity of 99%, gadolinium and yttrium are respectively added in the form of a Mg-90wt.% Gd master alloy and a Mg-25wt.% Y master alloy. After each master alloy is melted, the alloy melt is s...

Embodiment 2

[0059] This embodiment relates to a rare earth magnesium alloy Mg-10wt.%Gd-3wt.%Y. The melting and refining process is as follows: all tools in contact with the alloy melt are painted in advance, and the tools, charge, refining agent, and sampling copper mold are all in the Dry at 180°C for more than 3 hours. Turn on the resistance furnace, preheat the stainless steel crucible to dark red, add magnesium ingots, and start feeding CO with a volume ratio of 100:1 at 300°C 2 +SF 6 Shielding gas until the casting work is completed. Raise the temperature of the crucible resistance furnace to 700°C until the pure magnesium is completely melted, and then adjust the temperature to 720°C-750°C. The magnesium in the alloy smelting base material with this composition is pure magnesium with a purity of 99%, gadolinium and yttrium are respectively added in the form of a Mg-90wt.% Gd master alloy and a Mg-25wt.% Y master alloy. After each master alloy is melted, the alloy melt is stirred ...

Embodiment 3

[0064] This embodiment relates to a rare earth magnesium alloy Mg-10wt.%Gd-0.5wt.%Ca. The melting and refining process is as follows: all tools in contact with the alloy melt are painted in advance, and the tools, charge, refining agent, and sampling copper mold are all Dry at 180°C for more than 3 hours. Turn on the resistance furnace, preheat the stainless steel crucible to dark red, add magnesium ingots, and start feeding CO with a volume ratio of 100:1 at 300°C 2 +SF 6 Shielding gas until the casting work is completed. Raise the temperature of the crucible resistance furnace to 700°C until the pure magnesium is completely melted, and then adjust the temperature to 720°C-750°C. The magnesium used in the alloy smelting base metal of this composition is pure magnesium with a purity of 99%, gadolinium is added in the form of Mg-90wt.%Gd master alloy, and calcium is added with 99.9% pure calcium (use filter paper to absorb the surface before adding pure calcium. Kerosene, us...

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Abstract

The invention discloses a preparation method of a semisolid slurry of a rare earth magnesium alloy. According to the guiding principle of promoting grain nucleation and inhibiting grain growth, pure aluminium is added into rare earth magnesium alloy melt, and a lot of fine dispersed Al2RE intermetallic compound particles which are generated by an in-situ reaction provide nuclei of heterogeneous nucleation for primary alpha-Mg so as to promote grain nucleation; and after the melt is transferred to a tundish, considering stability of a solid-liquid interface during the solidification process, the growth of a primary phase is delayed by reasonable control of cooling conditions in different stages of solidification so as to realize the effect of inhibiting grain growth. The invention provides a low-cost agitation-free green semisolid slurry preparation method. In comparison with a traditional semisolid slurry preparation technology, efficiency of the preparation method is improved greatly and cost is reduced remarkably. By the preparation method, a high-quality rheological slurry is provided for follow-up rheoforming of rare earth magnesium alloy, such as rheo-die casting, rheological squeeze casting and the like. The preparation method has a wide application prospect in rheoforming of a magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of semi-solid forming of metal materials, and relates to a method for preparing metal semi-solid slurry, in particular to a method for preparing semi-solid slurry of rare earth magnesium alloy. Background technique [0002] The semi-solid rheological forming technology is formed by alloy melt in the solidification to solid-liquid range directly under a certain forming process (die casting, squeeze casting, etc.) It reduces the cost of the manufacturing process of product parts, and thus becomes a promising material processing method in the future. High-strength heat-resistant rare earth magnesium alloy is an alloy material with great application value developed in recent years. It has high room temperature and high temperature mechanical properties on the basis of maintaining the advantages of magnesium alloys such as low density and high specific strength. , has great application potential in the applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C23/06B22D1/00
Inventor 汪存龙吴国华刘文才张亮戴吉春莫文飞丁文江
Owner SHANGHAI JIAO TONG UNIV
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