Research progress of high entropy shape memory alloys
TiNi shape memory alloys have excellent shape memory effect and superelasticity,making them widely used in aerospace,biomedical and other fields.However,with the growing demand for more challenging service environments,traditional binary TiNi alloys present many shortcomings and deficiencies,such as low phase transition temperature,loss of functional properties at high temperature,and insufficient strength,etc.It is essential to optimize the alloying compositions and heat treatment processes in order to enhance their properties,thus developing high-performance shape memory alloys.Moreover,the mechanical properties and functional properties of TiNi alloys are influenced by various factors.This article mainly summarizes the effects of various alloying elements on the microstructure,martensitic transformation behavior,shape memory effect and superelasticity of the alloy from the perspective of alloy composition.Combined with the concept of high entropy alloying,the progress made in the field of TiNi based high entropy shape memory alloys in recent years is summarized.Finally,the future development direction and application prospects of TiNi based shape memory alloys are outlooked.
high entropy shape memory alloyshape memory effectmartensitic transformationmicrostructure
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