Abstract
The fracture mechanisms in the extruded magnesium alloys with two different grain sizes, 2 and 50 μm, were investigated by SEM, TEM and EBSD micro structural observations. The coarse-grained alloy showed that the {10–12} type deformation twins formed at the beginning of test, and the crack was propagated into the boundaries between twins and matrix. On the other hand, the fine-grained alloy showed that the sub-grain boundaries formed instead of the deformation twins. No formation of twins at the early deformation stage causes a crack-tip blunting, and thus, the fracture toughness has a high value.
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