TiPt Base High Temperature Shape Memory Alloys
TiNi is one of the most excellent practical shape memory alloys and used as eyeglass frame,micro actuator,medical devices,and so on. Recently, the demand of high-temperature shape memory alloys is increasing to use them in gas turbines, rocket engines,automotive engines, and nuclear reactor environments. However, the martensitic transformation temperature related with the shape memory effect of TiNi is below 373 K. New alloy system should be developed to suffuse the demand. We have focused on TiPt as new high-temperature shape memory alloys due to its high martensitic transformation temperature from the B2 to B19 phases above 1173 K. The effect of Ir addition to TiPt on phase transformation and the shape memory effect has been investigated for Ti50 (Pt,Ir)50 with Ir contents between 5 and 37. 5at％. The phase transformation temperature increased with increasing Ir contents. Relatively large strain recovery rate was obtained in Ti5o(Pt,Ir)5o with 1030at％Ir. The highest shape recovery rate was 57％ in Ti-25Pt-25Ir after deformation at 1123 K,followed by heating to above At. Strain recovery of Ti50(Pt,Ir) S0is discussed along with volume change between the B2 and B19 phases during phase transformation,lattice parameter change depending on Ir contents,and microstructure.
Intermetallics Martensitic transformation highrtemperature shape memory alloys strain recovery
Y. Yamabe-Mitarai T. Hara T. Kitashima S. Miura H. Hosoda
National Institute for Materials Science,Tsukuba, Japan Hokkaido University,Sapporo, Japan Tokyo Institute of Technology ,Yokohama, Japan
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
870-874
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）