Preparation method of metal-based shape memory composite

Abstract

The invention discloses a preparation method of a metal-based shape memory composite. The preparation method comprises the steps that NiTi metal powder layers are laid between to-be-prepared adjacent metal plates to obtain laminated plates, the laminated plates are subjected to accumulative ply rolling treatment to obtain a composite plate, it is guaranteed that the corresponding NiTi metal powder layer is laid between any two adjacent metal plates in the accumulative ply rolling treatment process, and the composite plate is subjected to friction stirring processing treatment to obtain the metal-based shape memory composite. The reduction rate of each pass of accumulative ply rolling ranges from 40% to 55%, and the number of the rolling passes of accumulative ply rolling ranges from 2 to 8; and the rotating speed of friction stirring processing ranges from 375 r / min to 1,180 r / min, the advancing speed of friction stirring processing ranges from 75 mm / min to 235 mm / min, and the reduction rate of friction stirring processing ranges from 0.2 mm to 0.5 mm. Through the adoption of the laminating welding deformation method, the metal plates on different layers are changed, SMAs different in particle size and content are evenly and flatly laid between the plates, metal materials with different structures and properties can be prepared out, and the novel functional material in different service environments is met.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a preparation method of a metal matrix shape memory composite material. Background technique [0002] With the development of science and technology, there is an increasing demand for materials with special properties in many fields such as aerospace, electronics and automobile industries. Therefore, as a functional material, smart materials have great application prospects, and shape memory alloys (SMAs) are the most important components of smart composite materials due to their shape memory effect, high damping performance and pseudoelasticity. At present, the research on SMAs composite materials is very active, and NiTi shape memory alloy, as a typical representative of SMAs, not only has excellent shape memory effect and superelasticity, but also has good biocompatibility, and can be used to make vascular stents, lumens, etc. Medical devices such as endotrache...

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Problems solved by technology

But there are big problems. On the one hand, under high temperature conditions, the shape memory effect is destroyed, and intermetallic compounds with brittle phases are easily formed at the interface, which reduces the bonding effect of the material; on the other hand, it is easy to make the shape memory alloy Particles are agglomerated and cannot be uniformly dispersed in the matrix, and the test period is long, requiring high equipment

Ma Zongyi and others tried to make aluminum matrix composites by drilling and slotting in the center of the plate, adding shape memory particles, and preparing aluminum matrix composites through friction stir processing, but the thickness of the available plate was thin and the particles were lost to a certain extent, which limited the use

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