J. Phys. IV France
Volume 112, October 2003
Page(s) 877 - 880

J. Phys. IV France
112 (2003) 877
DOI: 10.1051/jp4:20031021

Shape memory effect in Ti-Ni alloy thin sheets/foils produced via ultrafine laminates

D. Tomus1, K. Tsuchiya1, M. Inuzuka1, M. Sasaki2, D. Imai2 and M. Umemoto1

1  Department of Production System Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
2  Nippon Metal Ind. Co. Ltd., Sagamihara, Kanagawa 229-1184, Japan

ln the present paper, we describe a new processing method to produce thin foils of TiNi shape memory alloys starting from ultrafine laminates of pure Ti and Ni. The final thickness of the Ti/Ni laminate is 100 or 50 $\mu$m after hot and cold rolling. The laminates are diffusion treated at 1073-1173 K to obtain TiNi B2 phase. Some samples are further subjected to low temperature aging at 673-773 K in order to study two-way shape memory effect. The shape memory strain in foils with 50 $\mu$m thickness is about $1.25 \times 10^{-2}$ after diffusion treatment. Two-way memory of $2 \times 10^{-4}$ was also found in 50 $\mu$m foils.

© EDP Sciences 2003