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

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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.

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ACKNOWLEDGMENT

This study was supported by a Grant-in-Aid for Scientific Research (Grant No. JP16K21632) by the Japan Society for the Promotion of Science.

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  1. Kodai Niitsu

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

Authors and Affiliations

  1. Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan

    Kodai Niitsu, Yuta Kimura & Ryosuke Kainuma

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  1. Kodai Niitsu
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  2. Yuta Kimura
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  3. Ryosuke Kainuma
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Correspondence to Kodai Niitsu.

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Niitsu, K., Kimura, Y. & Kainuma, R. Transformation entropy change and precursor phenomena in Ni-rich Ti-Ni shape memory alloys. Journal of Materials Research 32, 3822–3830 (2017). https://doi.org/10.1557/jmr.2017.377

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