Enhanced nucleation and refinement of eutectic Si by high number-density nano-particles in Al-10Si-0.5Sb alloys

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• 作者：Fengxiang Guo^a ; ^c ; Wei Wang^b ; ^c ; ^{wangwei040901@163.com} ; Wenhui Yu^c ; Yong Zhang^c ; Shaopeng Pan^c ; Zhonghai Zhou^a ; Dan Liu^c ; Jingyu Qin^c ; Yao Wang^b ; ^{wangyaoqdu@126.com} ; Xuelei Tian^c ; ^{tianxuelei@sdu.edu.cn}
• 关键词：Al&ndash ; Si alloys ; High number-density nano-particle ; Precursor-assisted nucleation ; Atomic structure ; Eutectic Si refinement
• 刊名：Materials & Design
• 出版年：2017
• 出版时间：5 March 2017
• 年：2017
• 卷：117
• 期：Complete
• 页码：382-389
• 全文大小：1718 K
• 卷排序：117

文摘

The addition of 0.5wt.% Sb with a holding time over 60 min leads to the disappearance of twin and the formation of high number-density Al-rich nano-particles in eutectic Si, which act as nucleation precursors and promote the eutectic nucleation in Al–10Si alloy; A mechanism of precursor nucleation and microstructure transition is proposed, based on the formation of high number-density Al-rich nano-particles; The existence of AlSb clusters in the Al–10Si–0.5Sb melts is eliminated, while Sb–Si repulsive force and Sb–Sb segregation lead to aggregation of Si atoms and precursors, respectively.