Research on macroeffects and micromechanism of martensite phase transition of shape memory alloys by high-speed photography

Abstract

The paper, b means of High Speed Photography, records the changing process of helical springs made of Shape Memory Allo(SMA) in thermal cycles and the whole phase transition process of the material under microscope. B picture analysis, the paper shows clearly the macroeffects caused bY thermal elastic Martensite phase transition, reveals part of the micro-mechanism, obtained a definite relationship between temperature, deformation and resilient force in the phase transition process of thermal elastic Martensite and finds out the consistency of thermal elastic Martensite in the repeated thermal cycles. This will serve as a reference for the research of memory effect degradation and phase transition temperature shifting.