【摘要】 采用磁控溅射技术在TC4钛合金表面制备Cu/Ni多层膜,利用多冲和动态循环压压试验装置对膜层的力学性能进行了评价,探讨了冲击条件、多层膜调制周期及结构等对多层膜失效行为的影响,比较了多层膜和单层Cu、Ni膜在多冲条件下的失效行为,以及多冲与循环压压载荷对多层膜失效行为的影响。结果表明:多冲法能够较好地表征Cu/Ni多层膜的结合强度、韧性、内聚强度。压压载荷作用下多层膜的失效主要表现为单一的开裂现象,因而压压法更适合评价膜层的韧性。采用合适的过渡层、离子辅助和基材加热方法可以获得高的多层膜强度和韧性;调制周期小于600nm的Cu/Ni多层膜的内聚强度、韧性及多冲承载能力高于Cu、Ni单层膜;调制周期小于200nm的多层膜呈现出明显的超硬度现象,且具有良好的强韧性能。更多还原

【Abstract】 The Cu/Ni multilayer was prepared on TC4 titanium alloy surface by magnetron sputtering.A impact tester and a repeating press tester have been used to evaluate the mechanical properties of the multilayer.The influence of impact conditions,modulation period and multilayer structure on failure behaviors of the multilayer was explored.The failure behaviors of Cu/Ni multilayer and Cu monolayer and Ni monolayer under impact load were compared,and the failure modes of the multilayer under impact and dynamical repeating press load were investigated.The results show that the impact test can better evaluate the mechanical properties including adhesion,toughness and cohesion of the Cu/Ni multilayer.The repeating press method is more suitable to evaluate the toughness of multilayer because the failure mode of the multilayer under dynamical repeating press load displays cracking mainly.The Cu/Ni multilayer with high strength and good toughness can be prepared by using suitable transition layer,ion assistance and heating substrate.The cohesive strength,toughness and impact bearing capacity of Cu/Ni multilayer with modulation period less than 600 nm are higher than that of Ni monolayer and Cu monolayer.Cu/Ni multilayer with modulation period less than 200 nm emerges obvious super-hardness phenomenon,and the multilayer has good toughness and high strength.更多还原