高温累积叠轧制备高性能多层铜/铝复合带材

摘要

Cu/Al multilayers were produced by high-temperature accumulative roll bonding (ARB) methods up to three passes. To achieve a high bonding strength, prior to ARB processing, the Cu and Al sheets were heated to 350, 400, 450 and 500 ℃, respectively. The mechanical properties were evaluated by tensile tests. The microstructure was examined by optical microscopy and scanning electron microscopy equipped with energy dispersive spectrometry. The ultimate tensile stress, the grain size and the thickness of diffusion layer of lamellar composites increase with rolling temperature. When the rolling temperature is 400 ℃, the laminates show the highest ductility, but the yield stress is the lowest. As the rolling temperature further increases, both the yield stress and the ultimate tensile stress increase and the ductility decreases slightly. The mechanical properties of lamellar composites processed by low and high temperature ARB are determined by grain size and the thickness of diffusion layer, respectively.%通过高温累积叠轧方法制备多层铜/铝复合带材.为获得高的界面结合强度,在叠轧前分别加热铜、铝带材至350、400、450和500℃.采用拉伸试验评估其力学性能,通过光学显微镜和配备有能量色散光谱仪的扫描电子显微镜检测材料的显微组织.研究发现:随着轧制温度的升高,层状复合带材的极限拉应力、材料晶粒尺寸和扩散层厚度均增大.当轧制温度为400℃ 时,复合带材具有最高的延展性,但屈服应力最低.随着轧制温度进一步升高,屈服应力和极限拉应力均增加,但延性略有下降.低温累积叠轧和高温累积叠轧制备的层状复合材料的力学性能分别由晶粒尺寸和扩散层厚度决定.