Abstract
The effect of the pre-ECAP heat treatment and ECAP (Equal Channel Angular Pressing) processing on the impact toughness and fracture morphology of the AlSi7Mg0.3 alloy was investigated. The pre-ECAP heat treatment (annealing at 550°C followed by quenching and ageing at 250°C) of as -cast alloy improved its ductility, which was necessary for its severe plastic deformation. The pre-ECAP heat treatment followed by ECAP processing (4 passes at room temperature using A-route) of as-cast alloy homogenized the distribution of silicon and intermetallic phase particles in the solid solution matrix and improved its impact toughness. The as-cast alloy sample was fractured mostly in brittle manner. The fracture cracks initiated and propagated mainly along eutectic particles networks. T he fracture surface of ECAPed sample showed a typical ductile characteristic. The fracture propagated along and/or across banded distribution of eutectic particles and across bands of solid solution matrix.
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