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The compressive creep behavior of a magnesium die-cast alloy with 8 wt.% Zn and 5 wt.% Al was investigated. We argue that grain boundary sliding does not contribute to the deformation. Creep data and microstructural analysis strongly support dislocation creep, influenced by the formation and over-aging of precipitates, as the dominant mechanism.
The microstructures of a fine and a coarse-grained magnesium alloy with 8 wt.% Zn and 5 wt.% Al were investigated. Both microstructures consist of dendritic magnesium grains with a coarse intermetallic phase at the grain boundaries. Our investigations showed that during solidification a quasi-crystalline grain-boundary phase forms which exhibits a pronounced thermal and mechanical stability.
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