Abstract
An AZ31-0.1Ca magnesium alloy produced by Soft-contact electromagnetic continuous casting (SEMC) was investigated. The flne homogeneous structure and the precipitated phases were obtained by SEMC. The efiects of microalloying of Ca and middle frequency electromagnetic fleld on AZ31-0.1Ca magnesium alloy were discussed. And the as-cast billets were extruded with difierent extrusion ratios subsequently. The alloy showed an ultraflne grain size of 2{5 „m due to dynamic recrytallization (DRX) in the course of hot extrusion. The comprehensive properties of the as-extruded alloy are the best at the extrusion ratio of 25, and the hardness, UTS and elongation are 73.9 HB, 356.8 MPa and 16.5%, respectively. KEY WORDS SEMC; Hot extrusion; AZ31-0.1Ca; Microstructure; Mechanical properties
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