Cu–Al interfacial compounds and formation mechanism of copper cladding aluminum composites

Copper cladding aluminum (CCA) rods with the section dimensions of 12 mm in diameter and 2 mm in sheath thickness were fabricated by vertical core-filling continuous casting (VCFC) technology. The kinds and morphology of interfacial intermetallic compounds (IMCs) were investigated by SEM, XRD and TE...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2017-11, Vol.27 (11), p.2521-2528
Main Authors: CHU, Di, ZHANG, Jian-yu, YAO, Jin-jin, HAN, Yan-qiu, WU, Chun-jing
Format: Article
Language:English
Subjects:
copper cladding aluminum composite
interfacial formation mechanism
vertical core-filling continuous casting
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Summary:Copper cladding aluminum (CCA) rods with the section dimensions of 12 mm in diameter and 2 mm in sheath thickness were fabricated by vertical core-filling continuous casting (VCFC) technology. The kinds and morphology of interfacial intermetallic compounds (IMCs) were investigated by SEM, XRD and TEM. The results showed that the interfacial structure of Cu/Al was mainly composed of layered γ1(Cu9Al4), cellular θ(CuAl2), and α(Al)+θ(CuAl2) phases. Moreover, residual acicular ɛ2(Cu3Al2+x) phase was observed at the Cu/Al interface. By comparing the driving force of formation for ɛ2(Cu3Al2+x) and γ1(Cu9Al4) phases, the conclusion was drawn that the ɛ2(Cu3Al2+x) formed firstly at the Cu/Al interface. In addition, the interfacial formation mechanism of copper cladding aluminum composites was revealed completely.
ISSN:1003-6326
DOI:10.1016/S1003-6326(17)60279-6