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Vol.37, No.5, 519 ~ 524, 1999
Title
Research Paper / Transformations : Shape Memory Behavior in Ductility Enhanced Ni-Al-Fe-Mn Alloys
최창수Chang Soo Choi, 정인상In Sang Chung
Abstract
Fe, Mn alloying effects on the shape memory behavior in two phases NiAl base shape memory alloys have been investigated. The γ phase formed by the alloying Fe or Fe+Mn affected drastically not only on the hot workability but also on the tensile ductility of these alloys at room temperature. The transformation temperature increased with increase in annealing temperature because of the change in composition of the β matrix. Martensite transformation temperature (M_s) of the alloys annealed at 1300℃ was above 150℃. And the shape recovery ratio of the alloys is about 70%. Since a part of shape recovery energy of β(β′) phase was consumed on shape recovery of γ phase plastically deformed, the less γ phase, the better shape memory effect. Therefore these results mean that NiAl alloys with Fe or Fe+Mn are potential shape memory alloys for applications above the temperature of 150℃.
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