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Recrystallization and superplasticity at 300 °C in an aluminum-magnesium alloy

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Abstract

Variations in thermomechanical processing (TMP) which regulate the microstructural characteristics and superplastic response of an Al-lOMg-0.1Zr alloy at 300 °C were evaluated. Mechanical property data revealed that the superplastic ductility can be enhanced by simultaneously increasing the total rolling strain, the reduction per pass, and the duration of reheating intervals between passes during isothermal rolling. Texture and microscopy data were consistent with the development of a refined microstructure by recovery-dominated processes, i.e., continuous recrystallization, during the processing. The mechanisms by which a refined substructure can be progressively converted into a fine-grained structure during repeated cycles of deformation and annealing are addressed. A qualitative description of the complex sequence of developments leading to a microstructure better suited to support superplastic response is presented.

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Authors and Affiliations

  1. NASA Langley Research Center, Analytical Services and Materials, Inc., 23665-5225, Hampton, VA

    S. J. Hales (Research Engineer)

  2. Department of Mechanical Engineering, Naval Postgraduate School, Monterey, 93943-5000, CA

    T. R. McNelley (Professor)

  3. Mechanical Engineering Department, Concordia University, H3G 1M8, Montreal, PQ, Canada

    H. J. McQueen (Professor)

Authors
  1. S. J. Hales
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  2. T. R. McNelley
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  3. H. J. McQueen
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Hales, S.J., McNelley, T.R. & McQueen, H.J. Recrystallization and superplasticity at 300 °C in an aluminum-magnesium alloy. Metall Trans A 22, 1037–1047 (1991). https://doi.org/10.1007/BF02661097

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  • DOI: https://doi.org/10.1007/BF02661097

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