日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 634-642

Potentials of Shape Memory Effect in (Pt, Ir)-50 at%Ti

Yoko Yamabe-Mitarai1, Toru Hara1, Seiji Miura2 and Hideki Hosoda3

1National Institute for Materials Science, Tsukuba 305-0047
2Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628
3Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 226-8503

Abstract:

It is known that some of platinum group metals base intermetallics have shape memory effect. We note PtTi because its phase transformation temperatures is at around 1273 K. The phase transformation of PtTi and the effect of Ir on the phase transformation were investigated by X-ray diffractometry (XRD), differential thermal analysis (DTA), in-situ surface observation in laser microscope, and microstructure observation in transmission electron microscopy (TEM). The shape recovery was investigated by dilatometry. Microstructure suggests martensitic phase transformation occurs in PtTi and (Pt, Ir)Ti. The shape recovery was found in some of the tested alloys. Potential of platinum group metals base intermetallics as high temperature shape memory alloys is discussed in this paper.


(Received 2005/2/18)

Keywords:

high-temperature shape memory alloys, PtTi, IrTi, B2, B19, martensitic transformation


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