In situ observation of remelting induced anomalous eutectic structure formation in an undercooled Ni-18.7 at.% Sn eutectic alloy

被引：52
作者：
Dong, H. [1 ]
Chen, Y. Z. [1 ]
Wang, K. [1 ]
Shan, G. B. [1 ]
Zhang, Z. R. [1 ]
Huang, K. [1 ]
Liu, F. [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
SCRIPTA MATERIALIA | 2020年 / 177卷 / 177期
基金：
中国国家自然科学基金;
关键词：
Eutectics; Ni-Sn alloys; Rapid solidification; Undercooling; CONTAINERLESS SOLIDIFICATION; RAPID SOLIDIFICATION; CO-SN; NI-SI; GROWTH; ORIGIN; INTERFACE; MECHANISM; KINETICS; STRENGTH;
D O I：
10.1016/j.scriptamat.2019.10.019
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：123 / 127
页数：5
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