Aging behavior of ultra-fine grained Al–0.5%Si–0.5%Ge alloy fabricated using ARB process

DOI Web Site 26 References
  • Nakagawa Keiyu
    Department of Mechanical Systems Engineering, Faculty of Engineering, Okayama University of Science
  • Tsuji Nobuhiro
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University
  • Terada Daisuke
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University
  • Nakano Toshihiko
    Graduate School of Engineering, Okayama University of Science
  • Nizam Khairul
    Graduate School of Engineering, Okayama University of Science
  • Kanadani Teruto
    Department of Mechanical Systems Engineering, Faculty of Engineering, Okayama University of Science

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  • ARB加工により作製された超微細粒Al–0.5%Si–0.5%Ge合金の時効挙動
  • ARB カコウ ニ ヨリ サクセイ サレタ チョウビサイリュウ Al-0.5%Si-0.5%Ge ゴウキン ノ ジコウ キョドウ

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Abstract

Using Vickers hardness measurements and TEM observation, this study investigated the aging behavior of ultrafine-grained (UFG) Al–0.5%Si–0.5%Ge alloy fabricated using six-cycle ARB processing. The hardness of the starting specimen of ultrafine-grained Al–0.5%Si–0.5%Ge alloy is about 2.3 times higher than that of the coarse-grained specimen. The starting UFG specimen showed ultrafine grains with mean size of 156 nm. The hardness of a UFG specimen aged at 473K decreased monotonously with increasing aging time. From TEM observations of the microstructure of UFG specimen aged after long-term aging at 473K, results show that the mean size of ultrafine grains increased significantly with increasing aging time. Furthermore, few precipitates exist inside gains, although many coarse precipitates exist at grain boundaries. The hardness of UFG specimen aged at 373K showed the maximum value. From TEM observations, results showed many elongated ultrafine grains, with many precipitates formed on the grain boundaries and inside grains of the specimens aged at 373K. These results suggest that precipitation hardening strongly affected the hardness in this alloy because it has many elongated ultrafine grains. Many fine Si–Ge precipitates formed inside grains of the UFG specimen aged at 373K in long-term aging.

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