(1. 东北大学 材料与冶金学院，沈阳 110819；2. 东北大学 材料电磁过程教育部重点实验室，沈阳 110819)
摘 要: 研究退火温度对异步轧制法制备的铜/铝复合板界面组织及力学性能的影响，采用SEM观察界面组织形貌，结合EDX、XRD分析界面物相成分，采用显微硬度和室温拉伸实验表征复合板的力学性能。结果表明，异步轧制法制备的铜/铝复合板界面形变储能较高，退火温度为400 ℃时界面扩散明显；随着退火温度的升高，复合界面先后生成金属间化合物CuAl2、Cu9Al4、CuAl相，界面撕裂位置位于金属间化合物之间；界面层的显微硬度比基体的高，这是因为受到硬脆性化合物和高温软化的共同影响；退火温度越高，复合板抗拉强度越低，断裂伸长率越大。研究表明，异步轧制法制备的铜/铝复合板最佳退火温度为400 ℃。
关键字: 铜/铝复合板；金属间化合物；退火；轧制复合；界面
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;2. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University,Shenyang 110819, China）
Abstract:The effects of annealing temperature on the interfacial microstructure and mechanical properties of Cu/Al clad sheet fabricated by asymmetrical roll bonding were investigated according to the microstructure observation by scanning electrical microscope (SEM) and the phase constituent measurement by energy dispersive X-ray detector (EDX) as well as X-ray diffractometer (XRD), in addition with the microhardness of interfacial zone and tensile test of clad sheet. The results indicate that the interfacial layer of Cu/Al clad sheet fabricated by asymmetrical roll bonding grows heavily at 400℃ due to the accumulated deform energy. The intermetallic compounds form in the order of CuAl2, Cu9Al4 and CuAl with increasing the annealing temperature, and peeling occurs between them. The interfacial microhardness is higher than that of the matrix due to the effect of annealing recovery and brittle intermetallic compound. The ultimate tensile strength decreases with rising the annealing temperature, while the elongation increases. According to the experiments, the optimal annealing temperature for Cu/Al clad sheet fabricated by asymmetrical roll bonding is 400 ℃.
Key words: Cu/Al clad sheet; intermetallic compound; annealing; roll bonding; interface
