Dynamic Electropulsing Induced Phase Transformations in a Furnace Cooled Zn-Al Based Alloy (ZA22)

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  • To S.
    State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University
  • Zhu Y. H.
    State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University
  • Lee W. B.
    State Key Laboratory in Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University
  • Liu X. M.
    Hefei National Laboratory for Physical Science at Microscales, University of Science and Technology of China

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Abstract

Multi-phase identification and phase transformations in a dynamic electropulsing treated Zn-Al based alloy (ZA22) were studied by using backscattered scanning electron microscopy (BSEM) and electron back-scattered diffraction techniques (EBSD). By using EBSD, two hcp phases η′S and η′T with a small difference of about 1% in lattice parameters (c/a) were discriminated. Two stages of phase transformations: (a) η′S→η′T+ε′T+α′T and ε+α→T′+η (in a way of quenching), and (b) T′+η→ε+α and η′T+ε′T+α′T→η′S (in a way of up-quenching), were detected. It was found that dynamic electropulsing was less effective in accelerating phase transformations than static electropusling. The mechanism of dynamic electropulsing induced phase transformations is discussed from the point view of Gibbs free energy and electropulsing kinetics.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 51 (11), 1997-2004, 2010

    The Japan Institute of Metals and Materials

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