In situ and ex situ studies of anomalous eutectic formation in undercooled Ni–Sn alloys

Zhao, Rijie; Wang, Yeqing; Gao, Jianrong; Baker, Evan B.; Matson, Douglas M.; Kolbe, Matthias; Chuang, Andrew Chih-Pin; Ren, Yang

doi:10.1016/j.actamat.2020.07.048

In situ and ex situ studies of anomalous eutectic formation in undercooled Ni–Sn alloys

Journal Article · Tue Sep 15 04:00:00 EDT 2020 · Acta Metallurgica

DOI:https://doi.org/10.1016/j.actamat.2020.07.048· OSTI ID:1774632

Zhao, Rijie; Wang, Yeqing; Gao, Jianrong; Baker, Evan B.; Matson, Douglas M.; Kolbe, Matthias; Chuang, Andrew Chih-Pin; Ren, Yang

Anomalous eutectic formation in undercooled Ni-Sn alloys was investigated by in situ X-ray diffraction and ex situ remelting and annealing experiments. Dynamic recrystallization and partial remelting of primary solids followed by repeated nucleation and growth of eutectic grains in the mushy zone were revealed by time-resolved X-ray diffraction. Ex situ experiments demonstrated that partial remelting of near-equilibrium solidified alloys of eutectic or near-eutectic composition can convert regular lamellar eutectic into anomalous eutectic, whereas high-temperature annealing of splat-quenched alloys of similar composition can convert eutectic or two-phase dendrites into anomalous eutectic. It is concluded that compared to ripening in solid-states, partial remelting of eutectic or two-phase dendrites in a mushy zone provides a more realistic mechanism for anomalous eutectic formation in undercooled solidification of Ni-Sn eutectic alloys. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: National Aeronautic and Space Administration (NASA); National Natural Science Foundation of China (NSFC)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1774632

Journal Information:: Acta Metallurgica, Journal Name: Acta Metallurgica Vol. 197; ISSN 0001-6160

Country of Publication:: United States

Language:: English

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