采用铸轧成型工艺制备了铜铝复合板, 并在250, 300, 350, 400 ℃进行退火处理(时间均为3 h), 研究了退火温度对复合板结合界面组织、物相和力学性能的影响。结果表明: 退火能促进复合板界面处金属间化合物的生成, 且在铝板侧富集CuAl2相, 铜板侧富集Cu9Al4, 90°剥离和拉伸过程中的开裂都沿着金属间化合物进行, 一定厚度的扩散层有利于复合板的界面结合; 铜铝复合板的最佳退火工艺为300 ℃×3 h, 在该工艺下, 扩散层可达2~3 μm, 抗拉强度和伸长率分别为109.7 MPa和31.8%。

Cu/Al composite plate was prepared by roll-cast process, and then was annealed at 250, 300, 350, 400 ℃ ( for 3 h ), the effects of annealing temperature on interface microstructure, phase and mechanical properties were studied. The results show that, intermetallic compound formation at interface was promoted by annealing, CuAl2 gathered at Al plate side and Cu9Al4 gathered at Cu plate side, the cracking in the processes of 90° peel and tensile was conducted along intermetallic compound, a diffusion layer with a certain thickness was good for interface bonding of composite plate. The best annealing process for Cu/Al composite plate was 300 ℃×3 h, by the process, the diffusion layer reached 2-3 μm thickness, and tensile strength and elongation of the composite were 109.7 MPa and 31.8%.