Pseudo-elasticity and super-plasticity of copper modified TiNi shape memory alloy

摘要

Unlike most of the structural intermetallic compound, TiNi is an exceptional example of inherent ductility. In addition to its interesting behavior of shape memory and high damping capacity due to martensitic transformation, the dual properties of pseudo-elasticity and super-plastiity co-exited in the same copper-modified TiNi-SMA, Ti_(50)Ni_(40)Cu_(10), at various temperature will attrach another attention in modern manufacturing technology. Expeirmental results shows that strain rate sensitivity coefficient of the Ti_(50)Ti_(40)Cu_(10)-SMA at 850 deg C with #epsilon# chemical bounds 10~(-4) sec~(-1) is m chemical bounds 0.45 ( n chemical bounds 1/m chemical bounds 2.2), where n is stress exponent, which is in the range of s uperplasticity.