累积叠轧Cu/Nb复合板材在形变与退火过程中的组织及性能演变

Mechanical properties and microstructure evolution of accumulative roll bonded Cu/Nb composite plates during deformation and annealing

采用金相显微镜、SEM、抗拉强度及硬度测试等手段,对累积叠轧Cu/Nb复合板材的组织结构、断口形貌及力学性能进行研究,分析了累积叠轧、退火处理对Cu/Nb金属复合板材微观组织结构及室温拉伸断裂行为的影响作用。结果表明：累积叠轧使Cu/Nb复合板材的强度和硬度升高,退火使Cu/Nb复合板材的强度和硬度下降。当退火温度为300℃时,能使Cu/Nb复合板材强度和硬度分别下降至约240 MPa和75 HV。当退火温度提高时,Cu/Nb复合板材的硬度在70-80 HV的范围内波动。在试验温度范围内退火,Cu/Nb界面处也无Cu、Nb元素扩散。此外,增加焊合界面的轧制次数及退火处理有助于Cu/Nb复合板材焊合界面结合强度的提高。

The microstructure,fracture morphology and mechanical properties of the Cu/Nb composite plates produced by accumulative rollbonding（ ARB） process were investigated using optical microscopy,scanning electron microscopy,strength and hardness measurements.The effect of ARB and annealing on microstructure and tensile deformation behavior of ARBed Cu/Nb composite plates was analyzed. The results show that the strength and hardness of the Cu/Nb composite plates increased after ARB process. The strength and hardness of ARBed Cu/Nb composite plates decrease after annealing treatment,to 240 MPa and 75 HV after annealed at 300 ℃ for 1 h respectively. With annealing temperature increasing,the hardness of the annealed samples is in the range of 70-80 HV. The diffusion between Cu/Nb interfaces does not occur during annealing. In addition,the increased number of ARB cycles and the annealing treatment are helpful to the bonding efficiency of Cu/Cu interfaces in the Cu/Nb composite plates.