FEM simulation of extrusion by ECAP method on magnesium alloy AZ91
by Radim Kocich, Miroslav Greger, Adela Machackova
International Journal of Computational Materials Science and Surface Engineering (IJCMSSE), Vol. 1, No. 4, 2007

Abstract: The simulation of extrusion process by (ECAP) technique, which involves a simple large shear deformation during passage through two intersecting channels, was applied to the AZ91 Mg alloy to obtain an ultrafine-grained microstructure. For the stress and strain intensity investigation, computer simulation was used. Temperature dependences of extrusion process have been detected along with others. Four pressings were conducted at 250°C, while the fifth pressing was conducted at 180°C. The grain refinement and homogeneity of grain-size distribution increased with pass number. Temperature of process was measured during pass and decreased with respect to the number of pass along with obtaining finer grains. Finite Element Method (FEM) simulation was examined on AZ 91 alloy by practical tests. The experimental result agreed well with that obtained from numerical analyses carried out based on the FEM. Presented paper shows evidences that this forming method is an efficient tool for improving the mechanical properties. [Received 15 March 2006; Accepted 9 March 2007]

Online publication date: Fri, 28-Dec-2007

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