Abstract
Age-hardened Al-1mass% Mg2Si-0.4mass%Si alloy specimens were deformed in tension. The displacement of scratch lines and the steps at grain boundaries were observed. The relationship between deformation inside grains and displacement of scratch lines was investigated by determining orientations of an individual grain using a SEM-ECP method. Folds observed near triple points of grain boundaries were further investigated. In the high temperature creep deformation of an Al-Mg alloy, the grain boundary sliding is proposed to be caused by deformation inside grains if the slip bands are continuous across grain boundaries. Similar slip bands were partly observed in the present Al-Mg-Si alloy. No remarkable difference in the slip systems were observed between solution-treated and age-hardened specimens. Folds observed in this work were roughly classified into two types besed on their morphologies: one was a sharp and straight fold and the other was a diffuse and broad fold. The former and the latter folds were considered to be formed by slip and kink mechanisms.
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