Determining recoverable and irrecoverable contributions to accumulated strain in a NiTiPd high-temperature shape memory alloy during thermomechanical cycling

作者：Monroe J A; Karaman I^*; Lagoudas D C; Bigelow G; Noebe R D; Padula S II

来源：Scripta Materialia, 2011, 65(2): 123-126.

DOI：10.1016/j.scriptamat.2011.03.019

• Shape memory alloys
• Coefficient of thermal expansion
• High-temperature recovery
• Transformation induced plasticity
• Creep

When Ni(29.5)Ti(50.5)Pd(30) shape memory alloy is thermally cycled under stress, significant strain can accumulate due to elasticity, remnant oriented martensite and plasticity. The strain due to remnant martensite can be recovered by further thermal cycling under 0 MPa until the original transformation-induced volume change and martensite coefficient of thermal expansion are obtained. Using this technique, it was determined that the 8.15% total accumulated strain after cycling under 200 MPa consisted of 0.38%, 3.97% and 3.87% for elasticity, remnant oriented martensite and creep/plasticity, respectively.

• 出版日期2011-7