NonBasal Textures in Magnesium Alloy Strips Produced by Extrusionmachining
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2014 The Minerals, Metals & Materials Society. A constrained chip formation technique, large strain extrusion machining (LSEM), was used to produce bulk magnesium alloy (AZ31B) strips with fine grain size (2-6 m) and non-basal textures. These characteristics are known to enhance the final formability. The deformation temperature during extrusionmachining was varied by preheating the workpiece to a range of temperatures (50C to 375C). Microstructural refinement and texture evolution were studied as function of deformation temperature. It was possible to refine the grain size down to ~2 m by restricting the dynamic grain growth at low to moderate deformation temperatures (below 320C). LSEM was shown to be capable of resulting in non-basal textures at low deformation temperatures (below 220C) as well as at elevated deformation temperatures (above 420C). The influence of active deformation mechanisms and dynamic recrystallization on the texture development is also addressed.
