Synthesis of bulk nanostructured aluminum alloy component through vacuum plasma spray technique

    Authors

    T. Laha; A. Agarwal; T. McKechnie; K. Rea;S. Seal

    Comments

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    Abbreviated Journal Title

    Acta Mater.

    Keywords

    aluminum alloys; plasma spraying; rapid solidification; splat quenching; nanostructured bulk component; STACKING-FAULT ENERGIES; HALL-PETCH RELATIONSHIP; AL-SI ALLOYS; NANOCRYSTALLINE MATERIALS; THERMODYNAMIC ASSESSMENT; NI SYSTEM; MICROSTRUCTURE; POWDERS; METALS; DEFORMATION; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

    Abstract

    The benefits of large-size engineering components with nanocrystalline structure (providing improved strength) are yet to be realized due to processing difficulties and associated grain growth problems. In this work, a free-standing bulk nanocrystalline structure of hyper-eutetic aluminum alloy (Al-21wt.%Si) has been fabricated through the vacuum plasma spray (VPS) forming technique using micron-size powder feedstock. Optical microscopy, scanning electron microscopy and transmission electron microscopy have been used to investigate the evolution of multi-scale microstructure as the result of rapid solidification in VIIS forming process. The characterization implies the presence of nanosized eutectic Al-Si grains (25-100 nm) With uniformly distributed Ultrafine primary silicon particles of submicron size. The effect of microstructural evolution on mechanical properties has been studied by tensile testing and microhardness measurement. A considerable improvement in ultimate tensile strength and hardness of the sprayed deposit has been observed in comparison with conventionally cast hypereutectic Al-17wt.%Si alloys. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    Journal Title

    Acta Materialia

    Volume

    53

    Issue/Number

    20

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    5429

    Last Page

    5438

    WOS Identifier

    WOS:000235919800016

    ISSN

    1359-6454

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