Aging and precipitation behavior in supersaturated Al-2%Fe alloy produced by high-pressure torsion

Jorge M. Cubero-Sesin, Masashi Watanabe, Makoto Arita, Zen Ji Horita

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    4 被引用数 (Scopus)

    抄録

    The aging behavior of a cast Al-2 wt.% Fe alloy processed by High-Pressure Torsion (HPT) at room temperature was studied by subsequent aging treatments at 200 °C. Observations by Transmission Electron Microscopy (TEM) revealed that the microstructure after HPT processing reached an ultrafine-grained level with an average grain size in the Al matrix of ~120 nm. The initial eutectic structures were fragmented into particles with sizes of less than 400 nm and partially dissolved in the matrix up to a supersaturated Fe content of ~1% as confirmed by X-Ray Diffraction (XRD) analysis. The peak-age condition was achieved within 0.25 h of aging, which provides the maximum hardness of ~200 HV. Analyses by high-resolution S/TEM show that round particles of Al6Fe with sizes of ~5-10 nm and semi-coherent with the matrix are the dominant precipitates in the peak-aged condition. The hardness increases by aging for 12 h above the as-HPT-processed level of 185 HV. The dominant precipitate phase transforms to Al3Fe in the over-aged condition with a loss of coherency during growth. Enhanced precipitation kinetics was observed because of high density of lattice defects induced by the HPT processing, which were also confirmed by significant recovery in the electrical conductivity of the samples after aging.

    本文言語英語
    ホスト出版物のタイトルAluminium Alloys, ICAA 2014
    編集者Knut Marthinsen, Bjørn Holmedal, Yanjun Li
    出版社Trans Tech Publications Ltd
    ページ766-771
    ページ数6
    ISBN(印刷版)9783038351207
    DOI
    出版ステータス出版済み - 2014
    イベント14th International Conference on Aluminium Alloys, ICAA 2014 - Trondheim, ノルウェー
    継続期間: 6 15 20146 19 2014

    出版物シリーズ

    名前Materials Science Forum
    794-796
    ISSN(印刷版)0255-5476
    ISSN(電子版)1662-9752

    その他

    その他14th International Conference on Aluminium Alloys, ICAA 2014
    国/地域ノルウェー
    CityTrondheim
    Period6/15/146/19/14

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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