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

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 r...

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Bibliographic Details
Published inScripta materialia Vol. 177; pp. 123 - 127
Main Authors Dong, H., Chen, Y.Z., Wang, K., Shan, G.B., Zhang, Z.R., Huang, K., Liu, F.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2020
Subjects
Eutectics
Ni-Sn alloys
Rapid solidification
Undercooling
Ni-Sn alloys
Undercooling
Rapid solidification
Eutectics
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Summary: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 α-Ni lamellae. During recalescence, a pronounced remelting of the Ni3Sn phase into liquid occurs, while the α-Ni lamellae subject to a rapid morphological transition into granules. Eventually, the completion of solidification leads to the AES formation. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.10.019