科研之友
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摘要
One of the prospective applications of wrought AM30 magnesium alloy is in the form of hollow circular extrusions. They can either be fabricated by employing a conventional conical die and mandrel that produce seamless extrudates, or by using a porthole die employing a welding chamber technique. The latter has become popular due to several advantages and has been adopted commercially for aluminium and magnesium alloy extrusions. In the present investigation, cast billets of AM30 magnesium alloy were extruded under similar conditions, using two different dies, i.e., a conventional conical die and a commercially used porthole die. The extruded circular tubes produced by the two methods were characterized for their microstructure as well as physical and mechanical properties. The tubes fabricated using porthole die showed significant refinement in microstructure with improved mechanical properties, outside the seam-joint portion, compared to the tubes fabricated using conical die. The extrusion loads using porthole die, were, however, higher compared to the conventional method. Processing issues, structure and properties of magnesium extrusions, produced by the two methods, are discussed in details in this paper.
- 出版日期2009-9-19
