THE EFFECT OF EXTRUSION PARAMETERS ON POSSIBILITY OF EXTRUSION OF MAGNESIUM ALLOYS IN CONTINUOUS ROTARY EXTRUSION PROCESS

摘要

Continuous rotary extrusion (CRE) is the more and more frequently used variation of the plastic working process. Magnesium alloys, due to its properties are becoming increasingly popular as a substitute for aluminium alloys and steel, particularly in the aerospace and transportation industries. The main aim of this study was to optimize the parameters of the CRE process for selected commercial magnesium alloys such as AZ81 and AZ91. Extruded in CRE process rods were subjected to visual observations, microstructure examination, and testing of mechanical properties. Basing on the CRE test results and studies, parameters enabling successful execution of the process were specified. It was found that the greatest impact on the extrusion process has the die temperature, and it can be controlled mainly by adjustment of other CRE parameters (eg. process speed).