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采用柔性摩擦辅助电沉积技术在无添加剂的Watts液中制备(111)择优取向且平均晶粒尺寸约为24 nm的等轴纳米晶镍镀层。差示扫描热分析结果表明:该纳米晶镍镀层的快速晶粒生长峰值温度约为285.4°C,晶粒生长趋于平衡峰值温度约为431.5°C。等时退火结果表明:该纳米晶镍镀层因无硫而未观察到异常晶粒生长行为;同时由于其初始镀态的低能界面结构和一定量退火纳米孪晶的形成,降低了纳米晶粒生长的驱动力,导致其热稳定性得到改善,使得该镀层在450°C退火后,表现出很小的残余拉应力(约50 MPa)和较高的硬度(约HV 400)。
An equiaxed nanocrystalline nickel coating with (111) preferential orientation and an average grain size of about 24 nm was prepared in an additive-free Watts solution using a flexible friction-assisted electrodeposition technique. The results of differential scanning calorimetry show that the rapid growth temperature of the nanocrystalline nickel coating is about 285.4 ° C and the peak temperature of the grain growth tends to be about 431.5 ° C. The results of isochronal annealing show that no abnormal grain growth behavior was observed for the nanocrystalline nickel coating due to the absence of sulfur. At the same time, the nanocrystalline grain growth was reduced due to the formation of a low-energy interfacial structure and a certain amount of annealed nanocrystals Resulting in improved thermal stability such that the coating shows little residual tensile stress (about 50 MPa) and higher hardness (about HV 400) after annealing at 450 ° C.