Influence of Nb Addition on Phase Transformation of TiNiFe Shape Memory Alloy

Abstract:

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.

• Periodical: Materials Science Forum (Volume 687)
• Pages: 494-499
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.687.494
• Online since: June 2011
• Authors: Hang Man Lai, Fu Shun Liu
• Keywords: Martensite Transformation, R-Phase Transformation, TiNiFeNb Shape Memory Alloys

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