Temperature memory effect of martensite and R-phase transformation in TiNi-based shape memory alloys

H. J. Yu; Z. G. Wang; X. T. Zu; Y. Q. Fu

doi:10.1117/12.780371

13 November 2007 Temperature memory effect of martensite and R-phase transformation in TiNi-based shape memory alloys

H. J. Yu, Z. G. Wang, X. T. Zu, Y. Q. Fu

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 642364 (2007) https://doi.org/10.1117/12.780371
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

The temperature memory effect (TME) phenomenon in the martensite or R-phase to parent phase transformation in TiNi-based shape memory alloys was studied by differential scanning calorimetry (DSC). It was found that an incomplete thermal cycle upon heating of SMAs (arrested at a temperature between austenite transformation start and finish temperatures or the start and finish temperatures of R-phase to parent transformation) will induce a kinetic stop in the next complete thermal cycle. The kinetic stop temperature was closely related to the previous arrested temperature. Results showed that the TME is a common phenomenon in shape memory alloys, caused by a partial martensite or R-phase to parent phase transformation. The TME in the R-phase transformation is weaker than that in the martensitic transformation. The TME can be strengthened by performing many repetitions of partial transformation at the same arrested temperature.

Citation Download Citation

H. J. Yu, Z. G. Wang, X. T. Zu, and Y. Q. Fu "Temperature memory effect of martensite and R-phase transformation in TiNi-based shape memory alloys", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642364 (13 November 2007); https://doi.org/10.1117/12.780371

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