Atomic Study on Superelasticity of Niti Alloys in Ultra-Wide Temperature Range

Abstract

NiTi alloys are widely used in various complex temperature environments because of its excellent functional property of superelasticity(SE). It is of theoretical significance to study the mechanical properties of NiTi alloys by molecular dynamics method. In this paper, single crystal B2 phase NiTi alloy model is constructed, and the superelasticity of NiTi alloy model is simulated at a wide temperature range of 1000K by molecular dynamics method. The results show that NiTi alloys are highly sensitive to temperature. The increase of temperature will reduce the stability of superelasticity of NiTi alloys, promote the excitation of martensitic transformation and inhibit the transformation.