脉冲电沉积纳米晶Ni-Co合金的组织结构与力学性能  

Microstructures and mechanical properties of pulsed electrodeposition nanocrystalline Ni-Co alloy

作　　者：钟远辉[1] 戴品强[1] 许伟长[1] 庄美蓉[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350002

出　　处：《福州大学学报（自然科学版）》2008年第3期382-386,392,共6页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(E0410011);福建省科技重点资助项目(2006H0020)

摘　　要：采用X-射线衍射(XRD)、透射电镜(TEM)、能谱分析(EDS)等方法研究了脉冲电沉积法制备的纳米晶Ni-Co合金的微观组织结构和成分.测定了纳米晶Ni-Co合金的显微硬度和拉伸性能,研究了纳米晶Ni-Co合金中合金成分与力学性能的关系,并利用SEM对拉伸后断口进行分析.结果表明:合金中Co含量随镀液中Co2+浓度的增加而显著增加,并且随着Co含量的增加合金晶粒尺寸减小;合金显微硬度值随着Co含量的增加而增加.随着合金中Co含量的增加,断裂延伸率先逐渐减小,而后随着Co含量的增加而逐渐增大.拉伸过程晶粒尺寸明显增大,断口微观形貌呈韧窝状.Microstructures and composition of nanocrystalline Ni -Co alloy produced by pulse electro- deposition have been studied by XRD,TEM and EDS. The tensile properties and microhardness of the alloys was measured. Effect of composition on the mechanical properties of the alloys was studied. The fracture surface was analyzed by SEM. The results show that the Co content in the alloy increases significantly with the increasing Co^2＋ concentration in electrolytes. And with increasing of Co content the grain size decreases. The microhardness of alloy increases with the increasing Co content. With Co content increasing, the elongation decreases gradually. And then when the Co content increases further, the elongation increases. The grain size of alloy increases significantly after tensile test. The micrograph of the fracture surface show dimples.

关 键 词：脉冲电沉积 纳米晶体 NI-CO合金 力学性能 

分 类 号：TG172.5[金属学及工艺—金属表面处理]