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Phase Transformation and Shape Memory Effect of Ti–Pd–Pt–Zr High-Temperature Shape Memory Alloys

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Abstract

To understand the potential of high-temperature shape memory alloys, we have investigated the phase transformation and shape memory effect of Ti–(50 − x)Pt–xPd–5Zr alloys (x = 0, 5, and 15 at.%), which present the B2 structure in the austenite phase and B19 structure in the martensite phase. Their phase transformation temperatures are very high; A f and M f of Ti–50Pt are 1066 and 1012 °C, respectively. By adding Zr and Pd, the phase transition temperatures decrease, ranging between 804 and 994 °C for A f and 590 and 865 °C for M f. Even at the high phase transformation temperature, a maximum recovery ratio of 70% was obtained for one cycle in a thermal cyclic test. A work output of 1.2 J/cm3 was also obtained. The recovery ratio obtained by the thermal cyclic test was less than 70% because the recovery strain was < 1% and a large irrecoverable strain was obtained. The shape recovery was explained by the austenite strength. The training effect was also investigated.

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Acknowledgements

This research was supported in part by the Japan Society for the Promotion of Science (JSPS) through the “Funding Program for Next Generation World-Leading Researchers (NEXT Program),” initiated by the Council for Science and Technology Policy (CSTP). The authors wish to thank Mr. M. Nishio at NIMS for the EMPA analysis.

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Correspondence to Yoko Yamabe-Mitarai.

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Yamabe-Mitarai, Y., Takebe, W. & Shimojo, M. Phase Transformation and Shape Memory Effect of Ti–Pd–Pt–Zr High-Temperature Shape Memory Alloys. Shap. Mem. Superelasticity 3, 381–391 (2017). https://doi.org/10.1007/s40830-017-0131-2

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  • DOI: https://doi.org/10.1007/s40830-017-0131-2

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