Abstract
High-speed video filming is used to study the kinetics and morphology of the first deformation bands on the surface of the 5456 alloy having various initial microstructures. The mobility and morphology of the bands is found to change sharply after annealing in the vicinity of the solvus temperature. The dissolution of β(Al3Mg2) particles causes a transition from a plane into a branching morphology of the first bands and is accompanied by a sharp (almost an order of magnitude) increase in their mobility. The depinning of grain boundaries via the removal of β-phase particles is assumed to favor grain-boundary sliding, which causes branching of the bands.
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