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Microstructure of AZ91 in consecutive processing steps: (a) as-cast, (b) homogenized at 425 °C for 24 h. Forging took place using a material temperature of approx. 300 °C, die temperatures of 280 °C and a ram speed of 10 mms−1. The as-forged microstructures of parts cooled at air are shown in: (c) center area having high degree of deformation and (d) flange area with a lower degree of deformation.
