「スマートマテリアル」　Ｔｉ‐Ｎｉ‐Ｐｔ急冷凝固リボン材のマルテンサイト変態挙動と形状記憶特性

概要

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Martensitic transformation behavior and shape memory properties of Ti50Ni40Pt10 (TiNiPt) melt-spun ribbons fabricated by a single roll melt-spinning technique were characterized. The constituent phases of the as-spun ribbon were B2 (parent phase) and B19 (martensite phase) at room temperature. The B2-B19 martensitic transformation temperatures of the as-spun ribbon were 100 K higher than those of the bulk-material with the same chemical composition. The martensitic transformation temperatures of the as-spun ribbon were decreased with increasing the temperature of the heat-treatment made after the melt-spinning. As-spun ribbon and the heat-treated ribbons exhibited shape recovery by heating and/or pseudoelasticity. The martensitic transformation temperatures determined from the temperature dependence of the 0.2% flow stress of the pseudoelastic deformation were in good agreement with those of B2-B19 martensitic transformation determined by DSC. It was confirmed that the observed shape recovery and pseudoelasticity are shape memory effect and superelasticity, respectively, due to the B2-B19 martensitic transformation.
日本金属学会の論文