TY - JOUR
T1 - Phase Transformation and Shape Memory Effect of Ti–Pd–Pt–Zr High-Temperature Shape Memory Alloys
AU - Yamabe-Mitarai, Yoko
AU - Takebe, Wataru
AU - Shimojo, Masayuki
N1 - Funding Information:
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.
Publisher Copyright:
© 2017, ASM International.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - 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; Af and Mf 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 Af and 590 and 865 °C for Mf. 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.
AB - 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; Af and Mf 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 Af and 590 and 865 °C for Mf. 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.
KW - Martensitic transformation
KW - Shape memory alloys
KW - Strain–temperature test
KW - Titanium platinum
KW - Work output
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U2 - 10.1007/s40830-017-0131-2
DO - 10.1007/s40830-017-0131-2
M3 - Article
AN - SCOPUS:85069934076
VL - 3
SP - 381
EP - 391
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
SN - 2199-384X
IS - 4
ER -