Abstract
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.
Original language | English |
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Pages (from-to) | 123-127 |
Number of pages | 5 |
Journal | Scripta Materialia |
Volume | 177 |
DOIs | |
State | Published - 1 Mar 2020 |
Keywords
- Eutectics
- Ni-Sn alloys
- Rapid solidification
- Undercooling