Shape memory alloy particular enhanced copper-based composite material and preparation method

Abstract

The invention provides a shape memory alloy particular enhanced copper-based composite material and a preparation method. The shape memory alloy particular enhanced copper-based composite material isprepared by the following steps: S1, selecting micron order shape memory alloy particles and copper power particles (the particle sizes are smaller than 100[mu]m); S2, mechanically mixing the shape memory alloy particles and copper power particles for 20-80 minutes to obtain mixed powder; and S3, putting the mixed powder in a graphite mold to obtain the shape memory alloy particular enhanced copper-based composite material by means of a discharge plasma sintering method. Compared with pure copper, the strength of the shape memory alloy particular enhanced copper-based composite material is improved obviously, and large plastic deformation similar to that of pure copper is kept. The shape memory alloy particular enhanced copper-based composite material has a martensite phase transformationcharacteristic. Compared with a pressureless sintering method, the preparation method of the shape memory alloy particular enhanced copper-based composite material has the advantages of being short insintering time and low in sintering temperature and capable of pressurizing in a sintering process, and the interfacial reaction can be reduced obviously and the production efficiency can be improved.

Description

technical field [0001] The invention relates to a composite material and a preparation method, in particular to a shape memory alloy particle reinforced copper-based composite material and a preparation method. Background technique [0002] Shape memory alloy (Shape memory alloy, SMA) has a unique shape memory effect and superelasticity, and has a wide range of applications in various fields such as aerospace, instrumentation, temperature control, medical treatment, and artificial satellites. Among them, the shape memory alloy represented by NiTi alloy has always occupied a dominant position in the field of shape memory alloy due to its good shape memory effect, superelasticity, mechanical properties and corrosion resistance. NiTi alloy undergoes thermoelastic martensitic transformation (austenite → martensite) and reverse phase transformation (martensite → austenite) in the process of cooling and heating, respectively, which is the effect of alloy shape memory effect and su...

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Problems solved by technology

In the past, we used the pressureless sintering method (cold pressing + high temperature sintering) to prepare magnetic memory alloy particles / copper composite materials. The research found that due to the high sintering temperature, long sintering time, and the inability to pressurize during the sintering process, the magnetic memory alloy The interface reaction between particles and matrix is ​​strong, and there are many holes and defects in composite materials, etc.

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