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论文类型：期刊论文

发表时间：2017-10-15

发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS

收录刊物：SCIE、EI

卷号：721

页面范围：126-133

ISSN号：0925-8388

关键字：Intermetallics; Synchrotron radiation; Microstructure; X-ray diffraction

摘要：The structural evolution of peritectic solidification under the direct current (DC) field action, mainly on the morphological evolution of primary phase epsilon (Cu3Sn) and peritectic phase 11 (Cu6Sn5), is in situ observed by high resolution X-ray real-time imaging with synchrotron radiation. The ultimate solidification microstructures after experiencing the imaging experiment are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS). It is found that the eta phase precipitates directly from parent liquid phase without experiencing corresponding peritectic reaction when the DC field of 20 A/cm(2) or 200 A/cm(2) is imposed during the solidification process of the Sn-10%Cu alloy. It means that the DC field has altered the phase transformation sequence and suppressed the nucleation of primary e phase. Meanwhile, the growing and dissolving behaviors of secondary dendrite arm for intermetallic compound Cu6Sn5 under the DC field action are also in situ observed and discussed. (C) 2017 Elsevier B.V. All rights reserved.