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论文类型：期刊论文

发表时间：2017-06-01

发表刊物：MATERIALS CHARACTERIZATION

收录刊物：SCIE、EI、Scopus

卷号：128

页面范围：7-13

ISSN号：1044-5803

关键字：Al alloy; Segregation; Heterogeneous nucleation; High angle annular dark field (HAADF); Electron energy loss spectroscopy (EELS)

摘要：High angle annular dark field scanning transmission electron microscope imaging and electron energy loss spectroscopy were used to elucidate the heterogeneous nucleation interface of AIB(2) in an Al-7Si alloy. Si particles were observed in the vicinity of a AlB2 particle, but no significant Si-B-rich layer (such as SiB6) was observed at the interface between AlB2 and Al, strongly indicating that the proposed creation of a layer of SiB6 at the interface between AIB(2) and Al may only be metastable and further transform to other stable phase (e.g. Si) during solidification. The solidification path of Al-Si-B alloy was also discussed based on the binary phase diagrams and a ternary Thermo-Calc simulation using the Scheil module in conjunction with the TCAL3 database. These results provide new insight into the heterogeneous nucleation behavior of Al on AlB2 influenced by solute Si.