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

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タイトル別名
  • Aging behavior of ultra-fine grained Al–0.5%Si–0.5%Ge alloy fabricated using ARB process
  • 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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抄録

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.

収録刊行物

  • 軽金属

    軽金属 62 (11), 442-447, 2012

    一般社団法人 軽金属学会

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