Effect of ultrasonic treatment and Sr addition on microstructure of Al-20%Si alloy  

作　　者：Miao Long Lu Yiping Zhang Yubo Fu Ying Li Tingju 

机构地区：[1]School of Materials Science,Engineering,Dalian University of Technology

出　　处：《China Foundry》2013年第4期213-216,共4页中国铸造（英文版）

基　　金：financially supported by the National Natural Science Foundation of China under contract No.50874022

摘　　要：Many investigations have revealed that transition of melt structure can effectively influence the final solidification microstructures. In this study, ultrasonic treatment was applied to AI-20%Si melt and Sr-modified AI-20%Si melt at 720 ℃ （i.e. above liquidus of about 690℃） for 60 s, and then the melt was quickly quenched to room temperature. Experimental results show that ultrasonic treatment can refine the primary Si phase and a-AI of AI-20%Si alloy; strontium can make the morphology of Si phase spheroidized and refined as Sr addition changes the faceted growth characteristic of Si phase; however, the refinement effect of ultrasonic treatment on the primary Si phase and α-AI is weakened by Sr addition.Many investigations have revealed that transition of melt structure can effectively infl uence the fi nal solidifi cation microstructures.In this study,ultrasonic treatment was applied to Al-20%Si melt and Sr-modif ied Al-20%Si melt at 720℃(i.e.above liquidus of about 690℃)for 60 s,and then the melt was quickly quenched to room temperature.Experimental results show that ultrasonic treatment can ref ine the primary Si phase andα-Al of Al-20%Si alloy;strontium can make the morphology of Si phase spheroidized and refi ned as Sr addition changes the faceted growth characteristic of Si phase;however,the ref inement effect of ultrasonic treatment on the primary Si phase andα-Al is weakened by Sr addition.

关 键 词：ultrasonic treatment nucleation rate LIQUIDUS strontium modification QUENCHING 

分 类 号：TG146.21[一般工业技术—材料科学与工程]