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The limiting of the response time of shape memory alloy actuators
by the intrinsic transformation velocity


V. Prieb

"MFS-Büro Dr. Prieb"

Report on the Int. Conf.
"Readings on the materials with shape-memory and superelasticity effects,
24.-25. Mai 2000, Kiew", Kiew, 2000.

Abstract: What limits the frequency of shape memory actuators - the cooling rate or the transformation velocity? This question is investigated experimentally and discussed in this paper. The transformation frequency fa (the action frequency) is determined by the time of a one completely transformation cycle tc (response time).

It was measured Ti0.5Ni0.5 (B2-B191), Ti0.5Ni0.5-x(Au,Pd,Pt)x (B2-B19), Ti0.5Ni0.482Alx0.018 (B2-R-B191), Mn0.84Cu0.16 (fcc-fct) poly-crystals and (Cu-Al)-based (B2-9R) single crystals memory alloys.

The velocity of the single phase boundary (the soliton velocity) at the transformation of a Cu-Al-Zn single crystal at the indifferent phase equilibrium and at the strong not equilibrium conditions (shock induced transformation) was measured too.

More:

"Calorimetry of shape memory alloys"
- collected articles (pdf-file)