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Transformation Behavior of TiNiPt Thin Films Fabricated Using Melt Spinning Technique

  • Tomonari Inamura (a1), Yohei Takahashi (a1), Hideki Hosoda (a1), Kenji Wakashima (a1), Takeshi Nagase (a2), Takayoshi Nakano (a2), Yukichi Umakoshi (a2) and Shuichi Miyazaki (a3)...

Abstract

Martensitic transformation behavior of Ti50Ni40Pt10 (TiNiPt) melt-spun ribbons were investigated where the heat treatment temperature was systematically changed from 473K to 773K. A hot-forged bulk TiNiPt material with the similar chemical composition was also tested as a comparison. θ-2θ X-ray diffraction analysis and transmission electron microscopy observation revealed that the as-spun ribbons were fully crystallized. The apparent phases of as-spun ribbons at room temperature are both B19 martensite and B2 parent phase instead of B2 single phase for the hot-forged bulk material. No precipitates were found in as-spun and heat-treated ribbons. It was revealed by differential scanning calorimetry that all the specimens exhibit one-step transformation. The martensitic transformation temperatures of the TiNiPt as-spun ribbons are 100K higher than those of the hot-forged bulk material, and the martensitic transformation temperature decreases with increasing heat treatment temperature.

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Transformation Behavior of TiNiPt Thin Films Fabricated Using Melt Spinning Technique

  • Tomonari Inamura (a1), Yohei Takahashi (a1), Hideki Hosoda (a1), Kenji Wakashima (a1), Takeshi Nagase (a2), Takayoshi Nakano (a2), Yukichi Umakoshi (a2) and Shuichi Miyazaki (a3)...

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