Professor Koichi Tsuchiya of the Toyohashi University of Technology, Japan.

Nickel-titanium shape memory metal is usually available in wire form, made by wire drawing. Because of the lack of ductility, it is much more difficult to fabricate the alloy in sheet form. On the other hand, both nickel and titanium are ductile in their pure states. An ingenious method of making large quantities of alloy-sheet is to make a multilayered composite of alternating plates of nickel and titanium, fabricate the composite into the final sheet form using conventional rolling technology, and then allow interdiffusion to create the nickel-titanium solid solution. The diffusion rates of nickel in titanium and titanium in nickel are different, so the process results in Kirkendall porosity. The details of the manufacturing process can be found in the section on the Kirkendall effect. The movie presented here shows the operation of a sheet of shape memory metal



Reference: D. Tomus, K. Tsuchiya, M. Inuzuka, M. Sasaki, D. Imai, T. Ohmori and M. Umemoto: Scripta Mater. Vol. 48 (2003) 489.

More information available on Materials Function Control Laboratory, Toyohashi University of Technology.



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