Manufacturing method of shape memory alloy material

Abstract

Abstract PURPOSE:To obtain an NiTi memory alloy material with a simple production stage and high productivity by bringing an Ni material and a Ti material into tight contact with each other by a film forming method of press welding, plating or vapor deposition, heating the materials and forming an NiTi phase by reactive diffusion. CONSTITUTION:An Ni material and a Ti material are brought into tight contact with each other and thereafter the materials are heated and a TiNi phase is formed by reactive diffusion. The pure Ti rod 1 and pure Ni rod 2 are clad whereby the construction laminated with the Ti material and the Ni material can be obtd. in this case. The laminated rod is then heated to diffuse Ti to the Ni side and Ni to the Ti side. An intermetallic TiNi compd. layer 4 is formed in the central part by said diffusion. The layer 4 contains the three phases; Ti, Ni, TiNi and TiNi3. However if the Ti and Ni are beforehand so selected as to be incorporated at 1:1 by atom ratio and are heated for a long time, the intended shape memory alloy consisting of the rod of the single phase composed only of the TiNi phase 3 is obtd.

Inventors

• 👤 Kazuo Sawada
• 👤 澤田　和夫
• 👤 Kazuhiko Hayashi
• 👤 和彦 林

Bibliographic Details