<I>In-Situ</I> SEM/EBSD Observation of α⁄γ Phase Transformation in Fe-Ni Alloy

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  • Fukino Tatsuya
    Department of Nano Science and Technology, Graduate School of New Frontier Sciences, Kumamoto University
  • Tsurekawa Sadahiro
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University

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  • In-situ SEM/EBSD observation of α/γ phase transformation in Fe-Ni alloy
  • In situ SEM EBSD observation of a g phase transformation in Fe Ni alloy
  • <I>In-Situ</I> SEM/EBSD Observation of &alpha;&frasl;&gamma; Phase Transformation in Fe-Ni Alloy

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Description

The in-situ SEM/EBSD technique has been applied to observe the dynamics of ferrite(α) → austenite(γ) phase transformation and to examine the orientation relationship between α and γ phases in an Fe-9.5 at% Ni alloy. Random grain boundaries and grain-boundary triple junctions were found to act as preferential nucleation sites for γ phase. The effectiveness of triple junctions as the γ phase nucleation site in phase transformation increased with increasing number of random boundaries intersecting at a triple junction. Approximately 90% of allotriomorphic γ phase possessed either a Kurdjumov-Sachs (K-S) or a Nishiyama-Wasserman (N-W) orientation relationship (OR) with the α parent grains. The γ allotriomorphs with a special OR with one of the adjoining α parent grains preferentially grew into the α grain having the special OR with them, while the allotriomorphs with special ORs with both of the α grains grew into both adjoining α grains symmetrically.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 49 (12), 2770-2775, 2008

    The Japan Institute of Metals and Materials

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