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Transformation entropy change and precursor phenomena in Ni-rich Ti–Ni shape memory alloys

Published online by Cambridge University Press:  25 September 2017

Kodai Niitsu Open the ORCID record for Kodai Niitsu [Opens in a new window] ,
Yuta Kimura  and
Ryosuke Kainuma
Kodai Niitsu*
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
Yuta Kimura
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
Ryosuke Kainuma
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Many issues concerning the transformation behaviors in the Ni-rich Ti–Ni system remain unresolved, such as the isothermal nature of the B19′-martensitic and R-phase transformations and the precursor phenomena in the B2-parent phase. To clarify the origins of these behaviors, we investigated the transformation latent heat, specific heat, and superelastic behaviors of several Ni-rich Ti–Ni alloys in terms of the entropy change. An anomalous, very wide hump in the specific heat was detected for the B2-parent phase, which can likely be attributed to the precursor phenomenon in the B2-parent phase. In the critical region where the anomalous hump intersects the B19′-martensitic transformation, some evidences of the R-phase transformation were observed, such as a tweed-like microstructure and a specific heat peak with first-order-transformation characteristics. These findings suggest a strong relationship between the R phase and the precursor state in the B2-parent phase.

Keywords

specific heatphase transformationphase equilibria
Type
Invited Paper
Information
Journal of Materials Research , Volume 32 , Issue 20 , 27 October 2017 , pp. 3822 - 3830
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

b)

Present Address: RIKEN, Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.

Contributing Editor: Yang-T. Cheng

References

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