Aging Behavior of Ultrafine-Grained Al–Mg–Si–X (X = Cu, Ag, Pt, Pd) Alloys Produced by High-Pressure Torsion

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  • Akama Daichi
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
  • Lee Seungwon
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University WPI, International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University
  • Horita Zenji
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University WPI, International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University
  • Matsuda Kenji
    Graduate School of Science and Engineering for Research, University of Toyama
  • Hirosawa Shoichi
    Department of Mechanical Engineering and Materials Science, Yokohama National University

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タイトル別名
  • Aging Behavior of Ultrafine-Grained Al–Mg–Si–X (X = Cu, Ag, Pt, Pd) Alloys Produced by High-Pressure Torsion
  • Aging behavior of ultrafine-grained Al-Mg-Si-X (X=Cu, Ag, Pt, Pd)Alloys processed by high-pressure torsion

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説明

Age-hardenable Al–Mg–Si alloys containing additional elements of 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 5,400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300–430 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 elements. 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.

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