Until 1962 , Buehler and his collaborators observed with macroscopic shape memory effects such as changes in the atomic ratio of TiNi alloy , it attracted the attention of materials science and industry . By the early 1970s , CuZn, CuZnAl, titanium wire manufacturers CuAlNi also found in other alloys with shape memory effect martensitic transformation related . For decades, research on shape memory alloy has gradually become an important issue of international conferences and phase change materials conferences , and has held a number of symposia , and constantly enrich and improve the martensitic transformation theory . In theory deepening , while the application of shape memory alloys have also made considerable progress, its scope of application involves many areas of mechanical , electronic, chemical , aerospace , energy and medical. Specific applications of shape memory alloys below. Industrial applications: ( 1 ) the use of one-way shape memory grade 1 titanium effect of a one-way shape recovery . Such as pipe fittings, antenna , rings and so on. ( 2 ) extrinsic two-way memory recovery. Namely the use of one-way shape memory effect and lifting to do with the temperature outside help repeated actions, such as heat-sensitive components, robots, terminals , etc. ( 3 ) intrinsic two-way memory recovery. Namely the use of two-way memory effect with temperature elevating do repeated actions, such as heat engines , thermal components. But such applications faster memory decay , poor reliability , not commonly used. titanium welding wire ( 4 ) ultra- flexible application . Such as springs , terminal, eyeglass frames and so on. Medical Applications : biocompatibility TiNi alloy good use of its shape memory effect and superelasticity medical instances considerable .
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