Si对异步轧制Cu/Al-Si复合板界面组织及性能影响

Silicon on Microstructure and Mechanical Properties of Asymmetric Roll Bonded Cu/Al-Si Alloy Clads

在异步速比为1.7的异步轧制工艺下冷轧制备Cu/Al-Si复合板,不同Si含量的Cu/Al-Si复合板在400℃退火30 min后界面获得均匀厚度的金属间化合物。利用OM、SEM、EPMA、XRD、拉伸试验机等设备分析发现:复合板金属间化合物的厚度在Si含量为8.66%时最大;随着Si含量的增加,复合板的抗拉强度增大,延伸率、剥离强度减小,在Si含量为4.84%时综合拉伸性能最好,抗拉强度和延伸率分别为188.63 MPa、39.1%;Cu侧的拉伸断口形貌主要呈山脊状,Al-Si合金侧中心区域出现韧窝,韧窝数量随Si含量增加而增加。

Cu/A1-Si alloy clads were cold roll bonded with a mismatch speed ratio of 1.7 at ambient temperature, and uniform intermetallic compounds （IMCs） were formed when these Cu/A1-Si alloy laminates with different silicon contents were annealed at 400 ℃ for 30 min. OM, SEM, EPMA, XRD, and tensile machine were used to analyze the effects of silicon content. Results show that the width of IMCs reaches the maximum at 8.66% （wt%） silicon content. With increase of silicon in A1-Si alloy, the tensile strength of laminated composites increases while elongation and peeling strength of composites drop down, and their comprehensive tensile ~properties reach the best at 4.84% with tensile strength and elongation of 188.63 MPa and 39.1%, respectively. Meanwhile, fracture morphology of Cu/AI-Si alloy laminates in Cu side is ridge-like, and structure of A1-Si alloy in center region is mainly of dimples; the more silicon content in A1-Si alloy, the more dimples appear.