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

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Abstract

Through in-situ TEM observation on an Fe-30.3 mass%Mn-6.1 mass%Si shape memory alloy under extending at room temperature, it is found that on a lower applied stress level, the ε-martensite plates are preferentially formed at interfaces of pre-existing overlapped stacking faults or ε-martensites with γ-phase especially at those near by the stress-concentrated locations e.g. inclusions. It is also observed that the ε-martensite is growing by the motion of partial dislocations resulting in the widening and thickening of stacking faults until it is stopped by another martensite plate or grain boundary. On higher stress level, groups of highly oriented ε-martensite plates are formed by an autocatalytic activating mechanism suggested by the present authors.

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