Magnesium alloyed with 0.3 wt.% Zr was processed by extrusion followed by equal channel angular pressing (ECAP) for 1, 2, 4 and 8 passes. The material was characterized using microhardness measurements, compression tests and electron backscatter diffraction (EBSD). Coarse microstructure after extrusion was significantly refined. Microstructure after 1 and 2 ECAP passes was bi-modal and become homogeneous with average grain sizes ~2 μm after 4 ECAP passes. Zr addition was found to be critical for retaining refined microstructure. The highest microhardness was measured in the samples after 2 and 4 ECAP passes. Similar evolution was found for yield compression stress measured in normal direction. On the other hand, values of yield strength measured in extrusion direction were saturated in the samples after 2, 4 and 8 ECAP passes. Processing by ECAP led to significant microstructural refinement and substantial increase in strength.Keywords: Magnesium alloys, ultrafine-grained materials, equal channel angular pressing, electron backscatter diffraction
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