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研究异步冷轧退火工艺制备的Al/Cu多层复合材料的组织演化及其对力学性能的影响。采用SEM和TEM分析界面组织,用界面剥离实验和拉伸实验测试复合板的力学性能。结果表明:异步冷轧复合工艺可以获得界面紧密连接的超细晶多层复合材料。退火促进Al和Cu连接界面上金属原子的扩散,甚至导致金属间化合物的生成。复合板的连接界面在300°C退火时发生固溶强化现象,界面的连接强度达到最大,但是在更高温度退火时界面生成的金属间化合物导致连接性能急剧下降。在300°C退火时,复合板组织发生再结晶并获得较高的抗拉强度;而在350°C退火时,界面存在亚微米厚度的过渡层,有利于位错滑移运动,因此复合板获得较高的伸长率。
The microstructure evolution and its effect on the mechanical properties of Al / Cu multilayered composites prepared by asynchronous cold rolling were investigated. The interface microstructure was analyzed by SEM and TEM, and the mechanical properties of the composite plate were tested by the interface delamination test and the tensile test. The results show that the as-fabricated cold-rolled composite process can obtain the ultrafine-grained multilayered composites with close interface. Annealing promotes the diffusion of metal atoms at the interface of Al and Cu, leading to the formation of intermetallics. The bonding interface of the composite plate was solution-strengthened at 300 ° C, and the bonding strength reached the maximum at the interface, but the intermetallic compound formed at the interface at the higher temperature resulted in a drastic decrease of the bonding performance. When annealed at 300 ° C, the composite plate recrystallizes and obtains higher tensile strength; while annealing at 350 ° C, there is a transition layer of submicron thickness at the interface, which is favorable for the dislocation sliding movement. Therefore, the composite plate Get higher elongation.