High-specific-strength magnesium-lithium-based composite material and preparation method thereof

Abstract

The invention provides a high-specific-strength magnesium-lithium-based composite material and a preparation method thereof. The high-specific-strength magnesium-lithium-based composite material takes an ultra-light magnesium-lithium alloy LA141 as a matrix and multi-walled carbon nano-tubes as a reinforcement, and is prepared through the following steps that (1) an MWCNTs film layer is prepared through an electrophoretic deposition technology; (2) an LA141 / MWCNTs plate is prepared through accumulative roll bonding; and (3) stirring friction processing is carried out to prepare the LA141 / MWCNTs composite material. According to the magnesium-lithium-based composite material and the preparation method thereof disclosed by the invention, the preparation of the magnesium-lithium-based composite material is realized by combining the electrophoretic deposition technology, an accumulative pack rolling technology and stirring friction processing; the method is easy to operate and low in cost, and the composite material which is ultra-fine in grain, uniform in reinforcement distribution and high in specific strength is prepared.

Description

technical field [0001] The invention relates to a magnesium-lithium-based composite material and a preparation method thereof, in particular to a high-specific-strength magnesium-lithium-based composite material and a preparation method thereof. Background technique [0002] The study found that by adding Li element to Mg, the density can be reduced to 1.35-1.65g / cm 3 , 1 / 4-1 / 3 lighter than ordinary magnesium alloys, due to its low density, magnesium-lithium alloys are called ultra-light alloys. In addition, the addition of Li elements changes the lattice structure of Mg from hexagonal close-packed (hcp) to body-centered cubic (bcc). Since the body-centered cubic structure has more slip systems than the close-packed cubic structure, the plasticity of metal magnesium is improved. Shapeshifting ability. It can be seen from the binary phase diagram of the magnesium alloy that when the Li content is less than 5.70%, only the α-Mg phase exists in the alloy; when the Li content ...

AI Technical Summary

Problems solved by technology

Although magnesium-lithium alloy has many advantages such as low density, its strength is lower than other alloys, which limits its scope of application. Therefore, it is urgent to increase its strength and expand its scope of use.

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