✍ Scribed by P. Singh; J.T. Evans; N.J.H. Holroyd
No coin nor oath required. For personal study only.
Grain boundary sliding has been observed in an A1-Mg-Si alloy deformed at room temperature. The extent of sliding was primarily a function of the macroscopic strain whether this was produced by creep or in slow-strain-rate tensile tests but was more intense at low strain rates than at high strain rates. Grain boundary microcracks were observed to form after a critical amount of sliding at low strain rates. At high strain rates, microvoids nucleated at larger second-phase particles rather than in the grain boundaries. A consideration of the mechanisms which could operate to produce localized deformation indicates that the phenomenon is due initially to slip on the grain boundary plane itself but is quickly intensified by plastic flow within the precipitate-free zone after microvoids have nucleated. Plastic flow without the prior nucleation of holes cannot be sufficiently concentrated to account for the observed strain localization.
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