Rapid solidification of undercooled Cu-Ge peritectic alloy

Journal Article · Thu May 11 04:00:00 EDT 2000 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(99)00462-0· OSTI ID:20075944

Wang, N; Wei, B

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.

• Research Organization: Northwestern Polytechnical Univ., Xian (CN)
• OSTI ID: 20075944
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 8 Vol. 48; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER ALLOYS
DENDRITES
GERMANIUM ALLOYS
KINETICS
MICROSTRUCTURE
NUCLEATION
PHASE STUDIES
SOLIDIFICATION