Combined effect of pre-straining and pre-aging on bake-hardening behavior of an Al–0.6 mass%Mg–1.0 mass%Si alloy

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  • Masuda Tetsuya
    Graduate Student, Yokohama National University Aluminum Sheets and Coils Research Department, Kobe Steel, Ltd.
  • Takaki Yasuo
    Aluminum Sheets and Coils Research Department, Kobe Steel, Ltd.
  • Sakurai Takeo
    Aluminum Sheets and Coils Research Department, Kobe Steel, Ltd.
  • Hirosawa Shoichi
    Department of Mechanical Engineering and Materials Science, Yokohama National University

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  • Al–0.6%Mg–1.0%Si合金のベークハード挙動に及ぼす予ひずみ付与および予備時効処理の複合効果
  • Al 0 6% Mg 1 0% Si ゴウキン ノ ベークハード キョドウ ニ オヨボス ヨヒズミ フヨ オヨビ ヨビ ジコウ ショリ ノ フクゴウ コウカ

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The effect of pre-straining in combination with pre-aging on bake-hardening behavior of an Al–0.6 mass%Mg–1.0 mass%Si alloy was investigated by means of Vickers hardness test, electrical conductivity measurement, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Hardness change and DSC analysis revealed that only 3% pre-strain suppresses the formation of clusters; i.e. cluster (1), during single aging below 343 K. On the other hand, by combining with pre-aging at 343 K, pre-straining was found to improve bake-hardening response during final aging at 443 K. TEM observation confirmed that the improvement of bake-hardening response by pre-straining is mainly due to the enhanced precipitation of β″ phase in the matrix. These results are explained by the consideration that dislocations induced by pre-straining reduce the concentration of quenched-in excess vacancies, resulting in both the suppressed clustering of solute atoms during pre-aging and the accelerated precipitation of the β″ phase from more supersaturated solute atoms in final aging.

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