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The relationship of microstructure to monotonic and cyclic straining of two age hardening aluminum alloys

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Abstract

The effect of microstructure on the monotonic and low cycle fatigue properties of a high purity, large grain, ternary aluminum-zinc, magnesium (Al-Zn-Mg) alloy and a high strength 7050 aluminum alloy was investigated. The best combination of fatigue life, strength, and ductility for the ternary alloy resulted when aged to produce a microstructure containing predominately η′ having a Guinier radius of approximately 65å and a small amount of incoherent η (MgZn2). Superior fatigue life, strength, and ductility were found when the 7050 alloy was aged to produce the maximum number of partially coherent η′ precipitates having a Guinier radius of approximately 35å. Aging the 7050 alloy to produce particles larger than 50å gave a microstructure that had lower fatigue properties at the low plastic strain amplitudes, δεp/2 <1.0 pct. The empirical CoffinManson relationship was found to hold for a given deformation process, however changes in deformation character resulted in changes in the Coffin-Manson parameters.

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Authors and Affiliations

  1. Alcoa Research Laboratory, Aloca Center, 15069, PA

    T. H. Sanders (Metallurgist)

  2. School of Chemical Engineering and Metallurgy, Georgia Institute of Technology, 30332, Atlanta, GA

    E. A. Starke (Professor)

Authors
  1. T. H. Sanders
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  2. E. A. Starke
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Additional information

This research was supported by the U.S. Air Force Office of Scientific Research (AFSC) under Grant No. AFOSR-74-2615, Dr. Alan H. Rosenstein, Contract Monitor.

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Sanders, T.H., Starke, E.A. The relationship of microstructure to monotonic and cyclic straining of two age hardening aluminum alloys. Metall Trans A 7, 1407–1418 (1976). https://doi.org/10.1007/BF02658827

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  • DOI: https://doi.org/10.1007/BF02658827

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