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Herein, aging prior to extrusion is used to regulate the microstructure and mechanical properties of an extruded AZ91 alloys. The results show that pre‐aging can induce numerous precipitates in Mg matrix to refine the recrystallized microstructure during hot extrusion of AZ91 alloys. After extrusion, most precipitates distribute at grain boundaries, suppressing grain growth. Thus, coupling pre‐aging...
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