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

D. Tomus; K. Tsuchiya; M. Inuzuka; M. Sasaki; D. Imai; M. Umemoto

doi:doi:10.1051/jp4:20031021

Numéro		J. Phys. IV France Volume 112, October 2003


Page(s)		877 - 880
DOI		https://doi.org/10.1051/jp4:20031021

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

Abstract
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.