J Mater Sci Technol ›› 2001, Vol. 17 ›› Issue (02): 263-266.

• Research Articles • Previous Articles     Next Articles

Effect of thermal cycling under load on martensite transformation and two-way shape memory effect in a TiNi alloy

Liming WANG, Yufeng ZHENG, Wei CAI, Xianglong MENG, Liancheng ZHAO   

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
  • Received:1999-10-08 Revised:2000-01-17 Online:2001-03-28 Published:2009-10-10
  • Contact: Liming WANG

Abstract: The effect of thermal cycling under loading on martensitic transformation and two-way shape memory effect was investigated for Ti-49.8 at, pet Ni alloy. It is shown that M-s, and M-f temperature increase with increasing the number of cycles, while A(s) and A(f) temperature decrease during thermal cycling. The total strain at and permanent strain epsilon (p) increase with increasing applied stress and number of cycles. The two-way shape memory effect can be improved by proper thermal cycling training under loading, while excessively high applied stress results in the deterioration of TWSME. The reason for the changes in martensitic transformation characteristics and two-way shape memory effect during thermal cycling under loading is discussed based on the analysis of microstructure by TEM observations.

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