Time-Resolved Observation of DetAlled Formation Stage of Fe-/Mn-ContAlning Intermetallics in the Al-Si Casting Alloys
Time-resolved observation of synchrotron radiation was utilized to investigate the formation behavior of Fe-/Mn-contAlning intermetallic phases in the Al-Si casting alloys as functions of solute elements and cooling rate. For low Fe-/Mn-contAlning alloys, the primary α-AlFeMnSi phase was detected to crystallize from a liquid state, followed by the eutectic reaction regardless of cooling rate in this experimental range. During the eutectic reaction, the formation of the eutectic β-Al5FeSi phase was clearly observed to proceed in the inter-dendritic region after the emergence of dendritic α-Al in the Al-Si alloys. It was also observed that the average microstructural size of the specimen was noticeably reduced with the increasing cooling rate. For high Fe-/Mn-contAlning alloys, however, two primary phases of α-AlFeMnSi and α-AlFeSi were clearly seen at the low cooling rate regime, and three primary phases of β-Al5 FeSi, α-AlFeMnSi, and α-AlFeSi were recorded at the high cooling rate regime. Both primary crystallization systems of two different cooling rate regimes were followed by successive eutectic reactions to form an eutectic microstructure of α-Al and β-Al5 FeSi, of which microstructural size was less dependent on the cooling rate compared to that of the low Fe-/Mn-contAlning alloys.
Al-Si casting alloy Fe-/Mn-contAlning alloys solidification β-Al5 FeSi phase cooling rate time-resolvedobservation synchrotron radiation
Bonghwan Kim Kyongwhan Lee Hideyuki Yasuda Sangmok Lee
Liquid Processing & Casting Technology RID Department, Korea Institute of Industrial Technology,7 -4 Department of Adaptive Machine Systems, Osaka University, 2 - 1 Yamada-oka, Suita, Osaka, Japan
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
837-841
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）