High-strength high-modulus magnesium alloy and preparation method

Abstract

A high-strength high-modulus magnesium alloy comprises 3-20% of alloying element and the balance of magnesium substrate, wherein the alloying element comprises heavy rare earth, silicon and / or germanium, and tin and / or antimony and / or zinc; Si and Ge as well as Sn, Sb and Zn can be simultaneously added and can also be added individually; and the heavy rare earth is selected from at least one of gadolinium, dysprosium, terbium, holmium erbium, thulium, ytterbium and lutetium. The preparation method comprises the steps of: heating and melting pure magnesium in protective atmosphere, adding pure silicon to the pure magnesium melt, stirring, dissolving, heating-up to 20-30 DEG C, sequentially adding an interalloy of the other components, stirring, controlling the interalloy to be completely molten until the casting time is less than or equal to 4min, and casting to obtain a cast ingot. The high-strength high-modulus magnesium alloy is reasonable in component proportioning, and easy to process and manufacture; and the prepared high-strength high-modulus magnesium alloy has high room-temperature strength and elasticity modulus and better plasticity, and comprehensive performances apparently higher than those of the existing magnesium-rare earth, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a high-strength and high-modulus magnesium alloy and a preparation method thereof. The elastic modulus of the alloy at room temperature can reach 50-65GPa. It belongs to the field of non-ferrous metal materials and their processing. Background technique [0002] In order to achieve the purpose of reducing weight and increasing efficiency, the demand for high-performance lightweight materials in the manufacturing industry is growing rapidly. Magnesium alloy materials, as the lightest metal structural materials that can be industrially produced, have received special attention. In recent years, the speed of aerospace and transportation vehicles is getting higher and higher, and the required power is increasing, which puts forward higher requirements for the heat resistance and elastic deformation resistance of materials. Alloying is an effective means to improve the mechanical properties of alloys. Since the 1940s, a series of ...

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Problems solved by technology

Unfortunately, MgGd (56.9GPa), Mg 3 Gd(46.1GPa), Mg 7 Gd(52.6GPa), MgY(55.7GPa), Mg 24 Y 5 (53.8GPa) and MgNd (55.4GPa) and other phases have relatively low elastic modulus, so that the elastic modulus of Mg-RE alloy is also relatively low, only 40-45GPa, which ultimately leads to poor elastic deformation resistance and cannot meet Requirements for lightweight, high-strength, high-modulus heat-resistant magnesium alloy materials in the engineering field

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