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Structure and properties of a splat cooled 2024 aluminum alloy

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Abstract

Pound lots of splat cooled 2024 aluminum flake materials were produced by rapidly quenching the atomized melt against a rotating copper disc. Three flake sizes were selected, cold compacted into aluminum cans, and extruded at 300°C at a reduction ratio of 20 to 1. The extruded rods were reduced 50 pct by cold swaging, solution treated at 495°C, water quenched, and naturally aged. The splat cooled 2024 alloy had constituent particles of 1 fim and finer (compared to 5 to 20 μm for the commercial alloy); further, one of the complex constituent phases (AlCuFeMn) was essentially eliminated by the rapid quench. Compared to commercial 2024-T4, the splat cooled 2024 alloys showed 14 to 17 pct increase in yield and tensile strength (no loss of ductility) a seven-fold increase in fatigue life at 30,000 psi, and a large improvement in the 300°F (150°C) stress rupture life in tests beyond 100 h. The fracture characteristics of the splat alloys, while exhibiting excellent to superior ductility, appear inhomogeneous due to the presence of finely dispersed oxide films scattered in the structure.

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Author notes

  1. Nicholas J. Grant (Director, Professor)

    Present address: Department of Metallurgy and Materials Science, Massachusetts Institute of Technology, 02139, Cambridge, Mass.

Authors and Affiliations

  1. Westinghouse, Bettis Atomic Power Laboratory, 15122, West Miffin, Pa.

    Michael Lebo (Senior Engineer)

  2. Center for Materials Science and Engineering, USA

    Nicholas J. Grant (Director, Professor)

Authors
  1. Michael Lebo
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  2. Nicholas J. Grant
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Formerly Research Assistant, Department of Metallurgy and Materials Science, Massachusetts Institute of Technology

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Lebo, M., Grant, N.J. Structure and properties of a splat cooled 2024 aluminum alloy. Metall Trans 5, 1547–1555 (1974). https://doi.org/10.1007/BF02646325

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