Age-hardening behavior of thermomechanically treated Al-Mg-Si alloys

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  • KANEKO Junichi
    National Research Institute for Metals College of Industial Technology, Nihon University

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  • 加工熱処理したＡｌ‐Ｍｇ‐Ｓｉ合金の時効硬化挙動
  • カコウ ネツ ショリシタ Al Mg Si ゴウキン ノ ジコウ コウカ キョ

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Abstract

Age-hardening behavior in final aging of TMT, in which plastic deformation is applied after pre-aging but prior to final aging, has been studied. The hardening behavior in this type of TMT is in general correlation with that in two-step aging. The strength of TMT materials increases with rising pre-aging temperature. The amount of age-hardening is degreased by plastic deformation prior to final aging due to heterogeneous precipitation on dislocations. Pre-aging prior to plastic deformation is more effective in increasing the maximum hardness in final aging than in two-step aging. This is attributed to retardation of heterogeneous precipitation on dislocations. In commercial 6061 alloy, the strength can be increased by TMT as high as 10% in contrast to the high purity alloy of the same Mg2Si content. Such differences in two-step aging and TMT behaviors between high purity and commercial alloys are attributed to metallographic heterogeneity existing in the latter.

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