Effect of initial grain sizes on hardness variation and strain distribution of pure aluminum severely deformed by compression tests

Tadanobu Inoue, Zenji Horita, Hidetoshi Somekawa, Kazuyuki Ogawa

    研究成果: ジャーナルへの寄稿学術誌査読

    42 被引用数 (Scopus)

    抄録

    The effect of initial grain sizes on the evolution of microstructure and hardness with equivalent strain imposed in high-purity aluminum was studied through a combination of numerical simulation and experimental observations and measurements. Initial samples with four different grain sizes, ∼2, 6, 30 and 100 μm, were prepared by processing with equal-channel angular pressing followed by annealing. The cylindrical samples were compressed by 49% and 73% at a strain rate of 0.01 s-1 in a single pass at room temperature. The strain imposed by the compression was evaluated quantitatively using finite element simulation. The microstructures were observed using electron backscatter diffraction analysis and transmission electron microscopy. The results show that the difference in the initial grain sizes gives rise to inhomogeneous distributions of microstructure and strain even under the same reduction rate. The hardness variations with the strain also depend on the initial grain sizes and the hardness maximum appears at a lower value of strain as the initial grain size decreases. It is concluded that not only the imposed strain but also the initial grain sizes play an important role for the grain refinement.

    本文言語英語
    ページ(範囲)6291-6303
    ページ数13
    ジャーナルActa Materialia
    56
    20
    DOI
    出版ステータス出版済み - 12月 2008

    !!!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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