Microhardness measurements and the hall-petch relationship in an Al-Mg alloy with submicrometer grain size

M. Furukawa, Z. Horita, M. Nemoto, R. Z. Valiev, T. G. Langdon

    研究成果: ジャーナルへの寄稿学術誌査読

    448 被引用数 (Scopus)

    抄録

    An Al-3% Mg solid solution alloy was subjected to intense plastic deformation, using either equal-channel angular (ECA) pressing or torsion straining, to produce grain sizes in the submicrometer range. Static annealing at elevated temperatures led to grain growth and average grain sizes of up to > 100 μm. As-fabricated and statically annealed specimens were used to determine the variation in microhardness with grain size, and results confirm that the Hall-Petch relationship persists down to at least the finest grain size examined experimentally (~90 nm). The results provide no evidence to support the claims of a negative Hall-Petch slope when the average grain size is very small, but there is evidence of a decrease in the slope of the Hall-Petch plot at the very finest grain sizes (< 150 nm); this is attributed to the increased participation of mobile extrinsic dislocations in the boundary regions when taking the hardness measurements.

    本文言語英語
    ページ(範囲)4619-4629
    ページ数11
    ジャーナルActa Materialia
    44
    11
    DOI
    出版ステータス出版済み - 11月 1996

    !!!All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • セラミックおよび複合材料
    • ポリマーおよびプラスチック
    • 金属および合金

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