Electro-Discharge Consolidation of Atomized High Strength Aluminum Powders

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  • Qiu J.
    Department of Chemical and Materials Engineering, University of Kentucky
  • Shibata T.
    Sendai Institute of Materials Science and Technology, YKK Corporation
  • Rock C.
    Department of Chemical and Materials Engineering, University of Kentucky
  • Okazaki K.
    Department of Chemical and Materials Engineering, University of Kentucky

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  • Electro-Discharge Consolidation of Atom

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Abstract

Electro-discharge consolidation (EDC) was carried out for atomized Al-based alloy powders produced at YKK. Input energies of 2.5 to 3.8 kJ/g produced compacts of 88 to 99% in theoretical density. The densification can be described by a simple relation of Δρ=11.8[ERs⁄(Rs+2)]0.36 in % where Rs is the specimen resistance, and it predominantly depends on input energy, E. A comparison of XRD spectra before and after EDC with respect to the peaks’ position and intensity indicates that no microstructural change occurred. Oxide film removal by EDC was confirmed by TEM observations. Compression tests of EDC compacts at room temperature produced under the present conditions (specimen resistance Rs=9.4–15.8 mΩ) yielded 800 MPa and 24% elongation for true ultimate compressive stress and true compressive strain, respectively. The annealing treatment at 573 K for 1.2 ks raiseds compressive strength by at expense of ductility due to precipitation of solute atoms, indicating that a super-saturated solid solution is maintained in the EDC state.

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