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Defect structures and interactions in Al-Zn eutectoid alloys

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Abstract

Defect structures in superplastic and nonsuperplastic Al-Zn eutectoid alloys were studied by transmission electron microscopy. Slowly cooled alloys develop a fine lamellar microstructure and are not superplastic. The equiaxed quenched and quench-aged alloys, however, are super-plastic under the proper conditions of temperature and strain rate. Quench-aging produces sub-boundaries in the aluminum-rich α phase and dislocation loops in the zinc-rich β phase. Subsequent room temperature deformation creates a typical cold-worked dislocation structure in the α phase. At higher deformation temperatures, the cold-worked structure is increasingly replaced by a recovered structure. At the same time, the dislocation loop density in the β phase decreases to lower values. During superplastic deformation at 250βC, the dislocation loops in the β phase are annihilated by interactions with glide dislocations. In the α phase, a continuous, or steady-state, dynamic recovery process appears to operate. A completely recovered structure is maintained with dislocation-free subgrains.

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  1. Materials Research and Development Laboratory, Lockheed-Georgia Company, Marietta, Ga

    Eun U Lee & E. E. Underwood

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  1. Eun U Lee
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Lee, E.U., Underwood, E.E. Defect structures and interactions in Al-Zn eutectoid alloys. Metall Trans 1, 1399–1406 (1970). https://doi.org/10.1007/BF02900261

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