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Proceedings Paper

Temperature memory effect of martensite and R-phase transformation in TiNi-based shape memory alloys
Author(s): H. J. Yu; Z. G. Wang; X. T. Zu; Y. Q. Fu
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Paper 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.

Paper Details

Date Published: 13 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642364 (13 November 2007); doi: 10.1117/12.780371
Show Author Affiliations
H. J. Yu, Univ. of Electronic Science and Technology of China (China)
Z. G. Wang, Univ. of Electronic Science and Technology of China (China)
X. T. Zu, Univ. of Electronic Science and Technology of China (China)
Y. Q. Fu, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering

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