Abstract
This paper describes the effect of die semi-angles on the extrudabirity of AZ31B magnesium alloy. There were not very much change of extrusion load and tensile strength under die semi-angle 30° ,45° ,60° to 90° . And the surface roughness of the extruded rods without small, of die semi-angles may be little more similar to that of roughness than that of large die semi-angle. It became clear that it can not be obtained a good surface appearance with the 90° die because of the surface cracks.
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