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Title: Rapid solidification of undercooled Cu-Ge peritectic alloy

Abstract

Bulk samples of Cu-14.4 wt% Ge peritectic alloy has been undercooled by up to 200 K (0.166 T{sub 1}) with a glass fluxing technique. The solidified microstructures are mainly characterized by x-Cu dendrites plus {zeta} phase which forms in the interdendritic areas within the whole undercooling regime. With the increase of undercooling, both the secondary arm spacing of primary x-Cu dendrite and the layer thickness of the peritectic {zeta} phase decrease. The primary trunk and secondary arm of x-Cu dendrites show round shape under small undercooling condition, whereas they keep a good dendritic shape within a large undercooling regime, indicating that the peritectic reaction proceeds for a relatively longer period of time in the former case. The volume fraction of peritectic {zeta} phase increases with undercooing, but that of x-Cu dendrite shows a decreasing tendency. Furthermore, drop tube experiments were also performed to reveal the competitive nucleation and growth mechanisms of primary x-Cu dendrite and peritectic phase {zeta}. Calculations based on the current dendritic growth model are made to analyze the crystal growth kinetics during the rapid solidification of undercooled Cu-Ge peritectic alloy.

Authors:
;
Publication Date:
Research Org.:
Northwestern Polytechnical Univ., Xian (CN)
OSTI Identifier:
20075944
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SOLIDIFICATION; MICROSTRUCTURE; COPPER ALLOYS; GERMANIUM ALLOYS; NUCLEATION; DENDRITES; PHASE STUDIES; KINETICS

Citation Formats

Wang, N., and Wei, B. Rapid solidification of undercooled Cu-Ge peritectic alloy. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00462-0.
Wang, N., & Wei, B. Rapid solidification of undercooled Cu-Ge peritectic alloy. United States. doi:10.1016/S1359-6454(99)00462-0.
Wang, N., and Wei, B. Thu . "Rapid solidification of undercooled Cu-Ge peritectic alloy". United States. doi:10.1016/S1359-6454(99)00462-0.
@article{osti_20075944,
title = {Rapid solidification of undercooled Cu-Ge peritectic alloy},
author = {Wang, N. and Wei, B.},
abstractNote = {Bulk samples of Cu-14.4 wt% Ge peritectic alloy has been undercooled by up to 200 K (0.166 T{sub 1}) with a glass fluxing technique. The solidified microstructures are mainly characterized by x-Cu dendrites plus {zeta} phase which forms in the interdendritic areas within the whole undercooling regime. With the increase of undercooling, both the secondary arm spacing of primary x-Cu dendrite and the layer thickness of the peritectic {zeta} phase decrease. The primary trunk and secondary arm of x-Cu dendrites show round shape under small undercooling condition, whereas they keep a good dendritic shape within a large undercooling regime, indicating that the peritectic reaction proceeds for a relatively longer period of time in the former case. The volume fraction of peritectic {zeta} phase increases with undercooing, but that of x-Cu dendrite shows a decreasing tendency. Furthermore, drop tube experiments were also performed to reveal the competitive nucleation and growth mechanisms of primary x-Cu dendrite and peritectic phase {zeta}. Calculations based on the current dendritic growth model are made to analyze the crystal growth kinetics during the rapid solidification of undercooled Cu-Ge peritectic alloy.},
doi = {10.1016/S1359-6454(99)00462-0},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}