高温无氧轧制Cu/1060Al/Cu三层复合材料的力学和导电性能
收稿日期: 2025-02-28
修回日期: 2025-04-30
网络出版日期: 2025-07-08
基金资助
国家重点研发计划项目(2021YFB3701303);国家自然科学基金项目(U2037601)
Mechanical and Conductive Properties of Cu/1060Al/Cu Three-Layer Composite Prepared by High-Temperature Oxygen-Free Rolling
Received date: 2025-02-28
Revised date: 2025-04-30
Online published: 2025-07-08
Supported by
National Key Research and Development Program of China(2021YFB3701303);National Natural Science Foundation of China(U2037601)
为了解决传统冷轧工艺制备Cu/Al层状复合材料时常出现的界面结合性能差和氧化物生成问题,本工作采用高温无氧轧制工艺制备了Cu/1060Al/Cu三层复合材料,并对其力学性能和导电性能进行了系统研究。结果表明,经过2道次轧制和350 ℃、2 h退火的Cu/1060Al/Cu三层复合材料具有最优的综合性能,其屈服强度、抗拉强度和延伸率分别为107 MPa、178 MPa和67%。三层复合材料在界面层的耦合作用和两侧Cu层对Al层的牵制作用下,拉伸断裂模式为协同断裂。Cu/1060Al/Cu三层复合材料的电导率达到70.1%IACS,满足其作为导体材料的电导率指标要求。通过Ansys系统模拟了通交变电流时三层复合板内电流密度分布的变化情况。模拟结果表明,控制电流密度分布形式的主要因素是电流频率,通高频电流时电流密度分布具备趋肤效应的典型特征。在相同的电流频率下,交变电流密度随Cu层占比的增加而逐渐增加。在设计Cu层占比时,单侧Cu层占比的合理区间为10.0%~17.5%。
关键词: Cu/Al层状复合材料; 高温无氧轧制; 力学性能; 导电性能; Ansys模拟
蒋志达 , 胥杨洋 , 于佳新 , 刘文才 , 朱浩文 , 吴国华 , 尚郑平 . 高温无氧轧制Cu/1060Al/Cu三层复合材料的力学和导电性能[J]. 金属学报, 2026 , 62(3) : 431 -444 . DOI: 10.11900/0412.1961.2025.00057
Cu/Al laminated composites combine the lightweight advantage of aluminum with the high electrical and thermal conductivity of copper, and are widely used in the new energy, communication, electric power, and related industries. Traditionally, cold rolling has been the primary method for producing these composites; however, it often results in poor interfacial bonding and promotes the formation of oxides at the interface. In contrast, the high-temperature oxygen-free rolling process can significantly improve composite preparation by enabling precise layer temperature control and creating an anaerobic environment. This process typically forms a mechanical bonding interface, necessitating subsequent annealing to achieve a metallurgical bond that enhances interfacial integrity and optimizes performance. Therefore, developing an annealing process that complements the rolling method is essential. Based on this context, a Cu/1060Al/Cu three-layer composite was fabricated using T2 copper and 1060 aluminum as base materials. The effects of rolling passes and annealing parameters on the mechanical properties and conductivity of the composite were investigated. In addition, the current density distribution within the composite was simulated using Ansys software. After annealing at 350 oC for 2 h, the interface layer of the Cu/1060Al/Cu composite became uniform and continuous, with microcracks in the rolled interface layer effectively eliminated. According to strength-plasticity product calculations, the composite exhibited optimal overall performance after two rolling passes, achieving a yield strength of 107 MPa, tensile strength of 178 MPa, and elongation of 67%. Under the combined influence of the interface layer and the constraining effect of the copper layers on both sides of the aluminum core, the composite displayed a collaborative tensile fracture mode. The measured conductivity of the Cu/1060Al/Cu composite reached 70.1%IACS satisfying the requirements for conductor applications. The current density distribution in the annealed Cu/1060Al/Cu composite primarily varied with current frequency, demonstrating the skin effect characteristics typical of alternating current. The current density decreased with increasing frequency and increased with a higher proportion of the copper layer. Notably, increasing the copper layer proportion does not always lead to better performance. It is necessary to comprehensively consider electrical conductivity and material usage when determining the copper layer proportion. An appropriate range for the single-sided copper layer proportion is 10.0%-17.5%.
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