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Transformation characteristics of α1 Plates in Cu-Zn-Al Alloys

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Abstract

The formation of α1 plates during isothermal aging of a Cu-26.7 wt pct Zn-4.0 wt pct Al alloy at 150 °C to 350 °C follows thermally activated incubation kinetics. Early stage α1 plates possess an ordered 18R or 9R long-period stacking order (LPSO) crystal structure, with antiphase domain boundaries running continuously across the interface. The plates also exhibit invariant plane strain (IPS) crystallography consistent with calculations of the phenomenological theory of martensite crystallography (PTMC). The ordered LPSO structure and IPS crystallography are gradually annealed out only after extended aging as the structure changes to the equilibrium disordered face-centered cubic (fcc) one. High-resolution transmission electron microscopy (TEM) analyses reveal that early stage α1 plates have straight coherent interfaces. Prolonged aging induces misfit dislocations at the interface and causes the interface to protrude into the parent phase. Although microanalytical analyses indicate that a composition difference exists between the α1 plates and the parent matrix, solute depletion was observed at neighboring defects. These observations support the proposed transformation mechanism that the α1 plates nucleate at solute depleted defects through a shear mechanism and that subsequent plate growth is then controlled by a diffusional process.

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Author information

Authors and Affiliations

  1. Chief Metallurgist, Memry Technologies, Inc., 06804, Brookfield, CT

    M. H. Wu

  2. Sumitomo Metal Mining Co., Tokyo, Japan

    Y Hamada (Engineer)

  3. Department of MaterialsScience and Engineering, University of Illinois, 6180, IL, Urbana

    C. M. Wayman (Professor)

Authors
  1. M. H. Wu
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  2. Y Hamada
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  3. C. M. Wayman
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Formerly Visiting Scientist, with the Department of Materials Science and Engineering, University of Illinois

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Wu, M.H., Hamada, Y. & Wayman, C.M. Transformation characteristics of α1 Plates in Cu-Zn-Al Alloys. Metall Mater Trans A 25, 2581–2599 (1994). https://doi.org/10.1007/BF02649211

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