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Mg–9Al–1Zn (AZ91) cast ingots annealed at 420°C for 2 and 24h were hot extruded at 270°C, respectively. Microstructural observation showed that dynamic recrystallization (DRX) occurred in both cases resulting in fine equiaxed grains. It was revealed that the bar fabricated by extruding short-time annealed ingot had a much smaller average grain size (about 4μm) than that extruded with a long-time annealed...
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