Monel合金/Cu爆炸复合棒界面的微观组织和力学性能

Microstructure and mechanical properties of Monel alloy/copper explosive clad interface

利用爆炸复合的方法成功制备了Monel合金/Cu双金属复合棒材。借助金相显微镜(OM)、扫描电子显微镜(SEM)、能谱分析(EDS)和压剪分离测试,探讨了不同工艺条件下Monel/Cu爆炸复合界面的微观组织和力学性能。结果表明,随着爆炸比的增加,结合界面逐渐由平直状过渡到波状;在铜基体晶粒内的形变孪晶数量随爆炸比的增加而增加;界面局部存在少量熔区,熔区内存在细小的柱状晶;复合界面中没有发生扩散,但经过热处理后其界面观察到了扩散。剪切断裂发生在铜侧而非界面处,表明界面结合强度高于铜基体。

The Monel alloy/copper bimetal clad rod was produced with the explosive cladding technique. The microstructures and mechanical properties of the bonding interfaces were analyzed by means of optical microscope, scanning electron microscopy, energy spectrum analysis and shearing separate tests. The results showed that the smooth bonding interface was transformed to a wavy bonding interface as the explosive ratios increased. Deformation twins were observed in the grains of the copper matrix, whose amount increased with the increasing of the explosive ratio. There were a certain amount of molten zones in the interface and fine columnar grains existed in this molten zone. EDS analyses indicated that diffusion did not take place between bonding interfaces, however, diffusion was observed after annealing. The shearing fracture did't take place in the bond interface but in the copper plates.