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

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...

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%, but still can not meet the requirements of some high-end castings

To a certain extent, this greatly limits the application of heat-resistant magnesium alloy materials in the development and equipment of high-performance castings.

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