Aging behavior of ultrafine-grained Al-Mg-Si-X (X=Cu, Ag, Pt, Pd) alloys produced by high-pressure torsion

Daichi Akama, Seungwon Lee, Zenji Horita, Kenji Matsuda, Shoichi Hirosawa

    研究成果: Contribution to journalArticle査読

    抄録

    Age-hardenable Al-Mg-Si alloys containing an additional element of either Ag, Cu, Pt or Pd were processed by high-pressure torsion (HPT) and they were subsequently aged at a temperature of 373 K for up to a total period of 5400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300-400 nm and there were significant increases in the hardness through the HPT processing. The hardness was further increased by the subsequent aging treatment, confirming the simultaneous strengthening by grain refinement and fine precipitation. However, the aging behavior was different depending on the alloying compositions. In the Cu-added excess Mg alloy, the hardness increase was large and the higher hardness retained for longer aging time when compared with those of non-added alloys. It was suggested that the precipitation of a few particles within a single grain with the size of a few hundred nanometer contributes to appreciable age hardening.

    本文言語英語
    ページ(範囲)448-453
    ページ数6
    ジャーナルKeikinzoku/Journal of Japan Institute of Light Metals
    62
    11
    DOI
    出版ステータス出版済み - 2012

    All Science Journal Classification (ASJC) codes

    • 材料力学
    • 機械工学
    • 金属および合金
    • 材料化学

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