Influence of Nb Addition on Phase Transformation of TiNiFe Shape Memory Alloy
The influence of Nb addition on phase transformation, especially the intermediate R phase transformation and microstructure of TiNiFe shape memory alloys were investigated by means of electrical resistivity, optical microscope, energy dispersive spectroscopy and X-ray diffraction. The results showed that the R phase transformation was inhibited with the increase of Nb content. The martensite start transformation temperature decreased from 227K to 158K when the Nb content increased from 0.5 at.% to 2 at.%. The microstructure of the alloys were mainly characterized by TiNi matrix phase in which Fe and Nb resolved.
Chengming Li, Chengbao Jiang, Zhiyong Zhong and Yichun Zhou
H. M. Lai and F. S. Liu, "Influence of Nb Addition on Phase Transformation of TiNiFe Shape Memory Alloy", Materials Science Forum, Vol. 687, pp. 494-499, 2011