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论文类型：期刊论文

发表时间：2013-07-01

发表刊物：CHINA FOUNDRY

收录刊物：SCIE、Scopus

卷号：10

期号：4

页面范围：213-216

ISSN号：1672-6421

关键字：ultrasonic treatment; nucleation rate; liquidus; strontium modification; quenching

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 Al-20%Si melt and Sr-modified Al-20%Si melt at 720 degrees C (i.e. above liquidus of about 690 degrees C) 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 alpha-Al of Al-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 alpha-Al is weakened by Sr addition.