扩散退火和热轧温度对钛铜界面结合强度的影响

Effects of diffusion annealing and hot rolling temperature on Ti-Cu interfacial bonding strength

对热挤压的钛铜复合棒进行扩散处理,研究扩散退火温度及保温时间对界面结合强度的影响,并通过测试Ti和Cu在高温下的拉伸性能来选择较为合适的热轧温度。结果表明:扩散退火可有效促进界面处金属原子的扩散和增强结合强度,当扩散退火在780~800℃/30 min时复合界面的结合强度最高;钛铜复合棒热轧温度应选择780℃较为合适,此时Ti、Cu的强度和塑性指标相近,利于热轧时的均匀变形;钛铜复合棒的热轧结合机理可用N. Bay理论、热作用机制及位错学说进行解释。

Effects of diffusion annealing temperature and holding time on the interfacial bonding strength of a hot-extruded Ti-Cu composite rod by using diffusion treatment,and proper hot rolling temperature were selected by testing the tensile properties of Ti and Cu at high temperature. The results show that the diffusion annealing can effectively promote the diffusion of metal atoms at the interface and enhance the bonding strength. When the diffusion annealing is at 780-800 ℃ for 30 min,the bonding strength of the composite interface is the highest. The hot-rolling temperature of the Ti-Cu composite rod should be 780 ℃ at which the strength and plasticity indexes of Ti and Cu are similar and favorable for uniform deformation during hot rolling. The hot rolling bonding mechanism of the Ti-Cu composite rod can be explained by N. Bay theory,thermal mechanism and dislocation theory.