Structural evolution and the Hall-Petch relationship in an Al-Mg-Li-Zr alloy with ultra-fine grain size

Minoru Furukawa, Yoshinori Iwahashi, Zenji Horita, Minoru Nemoto, Nikolai K. Tsenev, Ruslan Z. Valiev, Terence G. Langdon

    研究成果: ジャーナルへの寄稿学術誌査読

    160 被引用数 (Scopus)

    抄録

    Experiments were conducted on an Al-5.5% Mg-2.2% Li-0.12% Zr alloy to investigate the feasibility of introducing an ultra-fine grain size using equal-channel angular (ECA) pressing and of retaining an ultra-fine grain size at elevated temperatures. It is shown that ECA pressing is capable of reducing the grain size from an initial value of ∼ 400 μm to a value of ∼ 1.2 μm. However, the microstructure after ECA pressing is heterogeneous, with many areas of equiaxed grains having high angle grain boundaries and some regions of subgrains with boundaries having low angles of misorientation. Unlike earlier experiments on Al-Mg binary alloys, it is demonstrated that the grain size of the Al-Mg-Li-Zr alloy is reasonably stable up to temperatures as high as ∼ 700 K because of the presence in the matrix of a fine dispersion of β′-Al3Zr precipitates. Microhardness data confirm the Hall-Petch relationship for grain sizes above ∼ 2 μm produced by annealing at temperatures above ∼ 673 K, but the Hall-Petch relationship breaks down at smaller grain sizes because of variations in the volume fraction of the δ′-Al3Li precipitates.

    本文言語英語
    ページ(範囲)4751-4757
    ページ数7
    ジャーナルActa Materialia
    45
    11
    DOI
    出版ステータス出版済み - 11月 1997

    !!!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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