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论文类型：会议论文

发表时间：2019-01-01

收录刊物：EI、CPCI-S

页面范围：1631-1635

关键字：Ultrasonic treatment; Al-Si alloy; Iron-containing intermetallics; Modification

摘要：The acicular beta-AlSiFe phase is most common but detrimental iron-containing intermetallic compounds (IMCs) in Al-Si casting alloys. In this study, ultrasonic field (USF) was applied to modify the acicular iron phases in Al-12Si-2Fe alloy. The results showed that USF treatment leads to different influence at different application temperature region. The application of USF at 720 degrees C facilitates the formation of blocky-shaped alpha-Al12Si2Fe3 phase and suppresses its conversion into the acicular beta-Al9Si2Fe2 phase by the quasi-peritectic reaction. The amount of alpha-Al12Si2Fe3 increases with increasing applied time of USF. The ultrasonic cavitation-induced nucleation is responsible for the morphological modification and phase transformation. USF applied at 610 degrees C causes a fragmentation of beta-Al9Si2Fe2 without composition change, and the cavitation-induced fragmentation is considered as the major reason.