The Calculation of Theoric Strain of NiTi Alloy Transformation by Thermodynamics Equilibrium

This paper describes a method for estimation of the theoretical transformation strain by means of the Clausius-Clapeyron equation. We determined the phase transformation temperatures in a equiatomic NiTi alloy with Differential Scanning Calorimetry(DSC). The constitutive behavior of samples was investigated using tensile tests. The theoretical axial transformation strain has been calculated applying the Calausius- Clapeyron equation.

Keywords:

Shape memory alloy , NiTi , Austenite , Martensite , Superelasticity , Transformation