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Effect of Heat Treatment on Solute Concentration at Grain Boundaries in 7075 Aluminum Alloy

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Abstract

The effect of heat treatment on the relative amounts of magnesium, zinc, copper, iron and silicon in grain boundaries of aluminum 7075 alloy was investigated with Auger electron spectroscopy in a scanning Auger microprobe. It was observed that both aging and solution treatments affect the distribution of these elements at grain boundaries. If identical solution heat treatments were employed, the aging treatment determined the solute distribution at the grain boundaries, and for fixed final aging treatment, the temperature of solution anneal determined the solute distribution. Among specimens given a T6 final aging treatment (24 h at 394 K (250 °F)) with prior solution treatment temperatures in the 666 K (740 °F) to 800 K (980 °F) range, 711 K (820 °F) solution treated specimen was found to have the least solute concentration at grain boundaries. The observed behavior is explained on the basis of equilibrium and nonequilibrium segregation of solute elements to grain boundaries occurring on quenching and during aging.

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Authors and Affiliations

  1. Physical Electronics Laboratory, Perkin-Elmer Corporation, 94043, Mountain View, CA

    A. Joshi (Director)

  2. Steel Authority of India, Ranchi, India

    C. R. Shastry (Assistant Research Manager)

  3. Corrosion Research Group, Army Materials and Mechanics Research Center, Watertown, MA

    M. Levy (Group Leader)

Authors
  1. A. Joshi
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  2. C. R. Shastry
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  3. M. Levy
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Joshi, A., Shastry, C.R. & Levy, M. Effect of Heat Treatment on Solute Concentration at Grain Boundaries in 7075 Aluminum Alloy. Metall Trans A 12, 1081–1088 (1981). https://doi.org/10.1007/BF02643489

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  • DOI: https://doi.org/10.1007/BF02643489

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