Abstract
The extrusion of hollow profiles with porthole dies is well known for aluminum alloys, but there is almost no data available regarding the formation and thus the quality of extrusion seams in magnesium hollow profiles. Therefore, extrusion experiments using magnesium alloys AZ31 and ME21 have been conducted with a porthole die which is designed in a way that the extrusion seams are located in the corners as well as in the middle of one of the profile surfaces. The profiles were analyzed for their microstructure with the focus on the extrusion seams compared to the seamless areas. These analyses were performed by OIM and SEM with EBSD. Furthermore, the mechanical properties of the extrusion seams were characterized by room temperature tensile tests in dependence of the extrusion direction. In order to optimize the extrusion of magnesium hollow profiles accompanying FE-simulations were carried out.
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