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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationInternational Conference on Smart Materials and Nanotechnology in Engineering
DOIs
Publication statusPublished - 1 Dec 2007
Externally publishedYes
EventInternational Conference on Smart Materials and Nanotechnology in Engineering - Harbin, China
Duration: 1 Jul 20074 Jul 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6423
ISSN (Print)0277-786X

Conference

ConferenceInternational Conference on Smart Materials and Nanotechnology in Engineering
CountryChina
CityHarbin
Period1/07/074/07/07

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