Improvement of shape memory effect for high-temperature shape memory alloys

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Shape memory effect is related with martensitic transformation in shape memory alloys. In this study, alloy design of high-temperature shape memory alloys whose applied strain at high temperature is recovered by heating above phase transformation temperature will be clarified. We focused on Ti(Pt, Ir) with high phase transformation temperature. Phase transformation and strain recovery of Ti(Pt, Ir) were investigated. The 2% of recovery strain was obtained in Ti(Pr, Ir) deformed at 850 degree C after heating above phase transformation temperature. It clearly indicates that Ti(Pt, Ir) is very promising as high-temperature shape memory alloys. It is also clear that strain recovery will be improved by controlling of phase transformation strain during phase transformation and crystal structure by addition of Ir.