Phase transformation behaviors and mechanical properties of TiNiMo shape memory alloys

Abstract

Phase transformation behaviors and mechanical properties of TiNiMo shape memory alloys have been investigated. It was found that the martensite transformation temperatures decrease drastically with increasing Mo content, while the R phase transformation temperatures vary slightly. Ti 50Ni 49.5Mo 0.5 and Ti 50Ni 49Mo 1.0 alloys exhibit good workability with lower σ y followed by drastically plastic deformation due to slip. Ti 50Ni 48Mo 2.0 alloy with moderate martensite transformation temperature, much higher yield strength and fracture strength measured to be 589 and 799 MPa, respectively, as well as Ti 50Ni 48.5Mo 1.5 alloy with appropriate martensite transformation temperature and excellent mechanical properties, are very promising for use as coupling materials.