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

Bohong Jiang; Tsugio Tadaki; Hirotaro Mori; T. Y. Hsu (Xu Zuyao)

doi:10.2320/matertrans1989.38.1078

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

Bohong Jiang, Tsugio Tadaki, Hirotaro Mori, T. Y. Hsu (Xu Zuyao)

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Keywords: iron-manganese-silicon, shape memory alloy, in-situ transmission electron microscopy, ε→γ transformation, partial dislocations

JOURNAL FREE ACCESS

1997 Volume 38 Issue 12 Pages 1078-1082

DOI https://doi.org/10.2320/matertrans1989.38.1078

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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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