Study on the Microstructure Evolution of Al-6.6Si Alloy Semi-solid Slurry Prepared by MSMT during Holding Process
Al-6.6Si alloy semi-solid slurry was produced by the technology of melt spreading and mixing(MSMT),the effect of cooling rate and holding time on the microstructure of semi-solid slurry during holding process was mainly investigated. The results indicate that the size and shape factor of primary α-Al phase decrease with increasing the cooling rate.Furthermore,the interface of primary α-Al phase is tend to destabilize and has the trendency to transform into dendrites if the cooling rate is too large,which decreases the fluidity of slurry.However,holding time mainly affects the morphology of α-Al primary phase,the size and shape factor of primary α-Al phase increase with increasing the holding time.