期刊
SCRIPTA MATERIALIA
卷 177, 期 -, 页码 123-127出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.10.019
关键词
Eutectics; Ni-Sn alloys; Rapid solidification; Undercooling
类别
资金
- National Natural Science Foundation of China [51771153, 51371147, 51790481, 51431008]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX201825]
The forming mechanism of anomalous eutectic structure (AES) in undercooled eutectic alloys has been a controversial issue. In this work, we conducted in situ observation of the AES forming process in an Ni-18.7 at.% Sn eutectic alloy using a high-temperature laser scanning confocal microscope. Our results provide an evidence of the AES formation induced by remelting of primary eutectic lamellae constituted by Ni3Sn and alpha-Ni lamellae. During recalescence, a pronounced remelting of the Ni3Sn phase into liquid occurs, while the alpha-Ni lamellae subject to a rapid morphological transition into granules. Eventually, the completion of solidification leads to the AES formation. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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