To assess potential routes for the production of high-strength Al 5083, gas-atomized powder was cryogenically ball-milled, to obtain a nanocrystalline structure, then hot vacuum degassed and consolidated by two methods: (1) hot isostatic pressing (HIPping) and extrusion, and (2) two-step quasi-isostatic (QI) forging. The consolidated billet in both cases was hot-rolled to produce 19 mm plate. Despite grain growth and differences in the consolidation and deformation processing, a similar, ultra-fine grained microstructure was obtained in both plates, with elongated grains predominantly in the range 100-500 nm. The cryomilled plates had similar tensile strengths in the plane of the plate, which were up to 60% greater than conventionally processed and work-hardened Al 5083. However, the QI-forged plate had significantly higher fracture toughness than the HIP/extruded plate, which was brittle for crack surfaces in the plane of the plate. The disparity in toughness values was attributed to differences in the prior powder particle boundary structure.


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    Title :

    Large UFG AI alloy plates from cryomilling


    Contributors:
    Newbery, A.P. (author) / Ahn, B. (author) / Topping, T.D. (author) / Pao, P.S. (author) / Nutt, S.R. (author) / Lavernia, E.J. (author)

    Published in:

    Publication date :

    2008


    Size :

    9 Seiten, 6 Bilder, 4 Tabellen, 15 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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