Investigation on Microstructure and Phase Transformation of La Added Ti49.3Ni50.7 Shape Memory Alloy

Jia Wen Xu; Ai Lian Liu; Bing Yu Qian; Wei Cai

doi:10.4028/www.scientific.net/AMR.557-559.1041

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Investigation on Microstructure and Phase Transformation of La Added Ti_49.3Ni_50.7 Shape Memory Alloy

Abstract:

The effect of La addition on the microstructure and phase transformation behavior of Ti _49.3Ni_50.7 alloy is investigated by optical microscope (OP), scanning electron microscope (SEM), X-ray diffraction analysis (XRD) and differential scanning calorimeter (DSC). The results show that the microstructure of Ti-Ni alloy is changed obviously with La addition, and the microstructure of Ti-Ni alloy containing La at room temperature is made up of the matrix and LaNi phase. La addition firstly increases the martensitic transformation temperatures evidently and the increase of Ms is about 62°C with 1at.% La. Secondly Adding La changes the type of phase transformation behavior of Ti-Ni alloys, and R phase transformation with Rs temperature about room temperature occurs in La added Ti-Ni alloy.