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

被引：53

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

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

页码：123 / 127

页数：5

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