Effects of Ti-Al Intermediate Alloy on Microstructure and Corrosion Performance of AZ91D Alloy
Ti-Al intermediate alloy was prepared using pure Al and Ti as raw materials by vacuum melting furnace under argon atmosphere.XRD,OM and SEM were utilized to systematically investigate effects of Ti-Al intermediate alloy contents on grain refinement and corrosion performance of AZ91D magnesium alloy.The results indicate when Ti content is 0.1%,the average grain size of AZ91D is decreased from 307 μm to 86 μm,and the corrosion weight loss rate is decreased from 0.781 7×10-4 g/(cm2·h)to 0.321 4×10-4 g/(cm2·h).Nevertheless,excessive addition of Ti(>1%)cannot further refine the grain size or improve the corrosion resistance of the AZ91D alloy.
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