Analysis of Microstructure of Al2O3/AZ91D Alloy under Multi-pass Hot Extrusion
AZ91D magnesium base alloy is widely used in mechanical equipment,and its properties directly affect the mechanical efficiency.AZ91D magnesium alloy containing alumina particles was prepared by multi-pass hot extrusion process.The microstructure of Al2O3/AZ91D alloy treated by different passes extrusion were analyzed.The results show that the alumina particles can be more evenly distributed in the alloy structure by multi-pass hot extrusion process.The grain size of the sample after four hot extrusions is nearly 50％smaller than that of the sample after one hot extrusions.After the multi-pass hot extrusion treatment,the alumina particles in good dispersion state are formed in the alloy,and the function of grain refinement is realized.
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