Twin-roll casting is a technique which allows production of high quality thin magnesium alloys strips with enhanced microstructure. However, further treatment using severe plastic deformation or annealing is required to improve mechanical properties of strips. Equal channel angular pressing is a very effective tool for grain refinement. In the present study the effect of annealing on the microstructure of twin-roll cast AZ31 magnesium alloy strip after equal channel angular pressing was studied. A significant grain refinement occurs already after two passes in both as-cast and aged alloys. Light and scanning electron microscopy were used for microstructure observations. The evolution of mechanical properties was investigated using Vickers microhardness measurements. The increase of microhardness with increasing number of ECAP passes was observed.Keywords: magnesium alloy, twin-roll casting, ECAP
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