Abstract
The application of hot extrusion and high-speed-ratio differential speed rolling (HRDSR) to a Ca-containing Mg-3Al-1Zn magnesium alloy, processed by electromagnetic casting in the presence of electromagnetic stirring, produced a novel microstructure, composed of an ultrafine grain size of less than 1 μm and very fine (Al,Mg) 2 Ca particles that were uniformly and densely distributed over the matrix. The HRDSR processed alloy exhibited excellent superplasticity at relatively low temperatures (below 523 K).
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