In this paper, grain refinement of pure magnesium using severe plastic deformation was investigated in order to enhance mechanical properties of the hard-to-deform metallic material. The microstructure and the mechanical properties of Mg processed by equal channel angular pressing (ECAP) at various processing temperatures were examined experimentally. ECAP of channel angle of 90 and corner angle of 0 was successful without fracture of the magnesium workpiece at 300 C, but not under 200 C. The hardness of the ECAP processed magnesium decreased with increasing ECAP processing temperature. The effect of temperature on the hardness, instrumented indenting response and microstructure of the ECAP processed magnesium were discussed. Fracture behavior during ECAP under different processing temperatures was demonstrated using the finite element method associated with ductile fracture model.
Equal channel angular pressing (ECAP) is so far the most viable severe plastic deformation procedure to extrude material by using specially designed channel dies without any substantial changes in geometry and to prepare an ultrafine grained material. Magnesium is the lightest of all structural metallic materials, but a typical hard-to-deform metallic material due to its HCP structure and associated slip systems. ECAP has been applied for a processing method of severe plastic deformation to achieve grain refinement of magnesium and to enhance it's low ductility. In particular, we investigated the deformation and fracture behavior of pure magnesium workpiece using experimental and numerical methods. The finite element method with different ductile fracture models was employed to simulate plastic deformation and fracture behavior of the workpiece.
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