Effects of Annealing on Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy after Equal Channel Angular Pressing

Abstract:

The effect of annealing temperature（300-600°C）on the microstructure and transformation temperature of NiTiNb shape memory alloy rods deformed with equal channel angular pressing（ECAP） method was analyzed. The results show that the hard brittle phase （Ti,Nb）₂Ni was decreased after ECAP. With the rising of annealing temperature, the number of β-Nb phase increase while eutectic declines. The DSC analysis shows that the martensite and reverse transformation temperature increase with annealing temperature. After annealing with 500°C, the martensite/austenite transformation starting temperatures rise to -64.6°C and -30.1°C, respectively.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 3-7
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.3
• Online since: May 2013
• Authors: Yuan Zhi Huang, Shi Qiang Lu, Jun Wei Liu, Ke Lu Wang, Gui Fa Li, Xiao Yong Shu
• Keywords: Annealing, ECAP, Microstructure, NiTiNb Shape Memory Alloy, Phase Transformation Temperature

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