<I>In-situ</I> TEM Observation of ε→γ Transformation during Heating in an Fe–Mn–Si Shape Memory Alloy

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  • Jiang Bohong
    Department of Materials Science, Shanghai Jiao Tong University
  • Tadaki Tsugio
    Department of Structural Characterization and Design Division of Advanced Materials Science and Technology, ISIR, Osaka University
  • Mori Hirotaro
    Research Center for Ultra-High Voltage Electron Microscopy, Osaka University
  • Hsu (Xu Zuyao) T. Y.
    Department of Materials Science, Shanghai Jiao Tong University

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  • In-situ TEM Observation of ε→γ Transformation during Heating in an Fe-Mn-Si Shape Memory Alloy
  • In-situ TEM Observation of イプシロン ガンマ Tr
  • <I>In-situ</I> TEM Observation of &epsilon;&rarr;&gamma; Transformation during Heating in an Fe&ndash;Mn&ndash;Si Shape Memory Alloy

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Abstract

In-situ TEM observation of the deformed specimen on heating from R.T. up to 873 K in an Fe-30.3 mass%Mn-6.1 mass%Si shape memory alloy has been performed. It is found that the thicker ε-martensite plates will be disintegrated layer by layer through the reverse motion and annihilation of partial dislocations and the last induced ε-martensite will be the first to disappear. The in-situ observations on heating of the secondary deformed specimen after once thermo-mechanical cycling has also been conducted, from which the improvement mechanism of thermo-mechanical training can be well explained.

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