Preparation method of multi-scale precipitation laminated structure magnesium alloy

Abstract

A preparation method of a multi-scale precipitation laminated structure magnesium alloy comprises the procedures of pretreatment, casting, multi-scale precipitation and the like, and comprises the following steps: selecting two or more magnesium alloys with different strengthening effect behaviors, and carrying out solid-liquid inlay casting to form a multi-layer composite magnesium alloy. And then through rolling and subsequent aging treatment, a multi-scale precipitated phase is formed among all laminates, and a multi-scale precipitation reinforced laminated structure magnesium alloy composite material is obtained. The toughness and strength of a soft phase and a hard phase of the prepared alloy are obtained to a certain extent, and the high-strength and high-toughness double-system or multi-system precipitation strengthened magnesium alloy with an excellent comprehensive performance is obtained. The precipitation reinforced magnesium alloy has good heat resistance, and the toughnessis far higher than that of a conventional uniformly precipitated magnesium alloy. And the mixed precipitation microstructure has no obvious directivity and is suitable for being applied to multidirectional stressed components.

Description

technical field [0001] The invention relates to a method for preparing a magnesium alloy with a multi-scale precipitation lamellar structure, specifically a method for preparing a magnesium alloy with a solid-liquid combination of two or more types of magnesium alloys with different precipitation strengthening effects by using inlay casting, and performing a process on the prepared material Aging treatment, using different aging precipitation behaviors of magnesium alloys, to obtain a multi-scale precipitation multilayer magnesium alloy preparation method. Background technique [0002] Magnesium alloy is currently the lightest metal structure material in practical application, and it is being increasingly widely used in the fields of national defense, aerospace, automobile, electronic communication and so on. Compared with other light metal structural materials such as aluminum alloys and titanium alloys, magnesium alloys have poorer strength and toughness. A large number o...

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Problems solved by technology

However, due to the poor deformability of the magnesium alloy itself, the lamellar Mg / Al alloy prepared by accumulative lamination needs to be carried out at high temperature, and there are technically the following problems: (1) it is difficult to control the oxidation of the interface; (2) high temperature It is easy to make the grain size grow, and it is impossible to obtain nano-scale or sub-micron grains; (3) The strengthening and toughening properties of layered Mg / Al composite materials have obvious directionality, which limits their use in many-to-many Application to parts with force requirements

However, the mixed crystal material prepared in this way has a single component and poor heat resistance

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