钴含量对电沉积纳米晶镍钴合金组织与力学性能的影响.pdf.pdf

文档介绍：第 20 卷第 1 期中国有色金属学报 2010 年 1 月
The Chinese Journal of Nonferrous Metals Jan. 2010
文章编号:1004-0609(2010)01-0092-08

钴含量对电沉积纳米晶镍钴合金组织与力学性能的影响

许伟长 1,戴品强 1, 2,郑耀东 1

(1. 福州大学材料科学与工程学院,福州 350108;
2. 福建工程学院材料科学与工程系,福州 350108)

摘要:采用脉冲电沉积技术制备钴含量在 %~%范围内的镍钴合金。利用 XRD 与 TEM 技术对纳米晶镍
钴合金的组织结构进行表征。结果表明:所有成分的纳米晶镍钴合金均为面心立方结构的单相固溶体,平均晶粒
尺寸为 11~24 nm,且平均晶粒尺寸随钴含量的增加而减小,镍钴合金镀态下 TEM 组织中观察到的晶粒尺寸与 XRD
测量结果一致;纳米晶镍钴合金抗拉强度为 1 300~1 650 MPa,断裂伸长率为 %~%,镍钴合金的抗拉强
度与断裂伸长率均随钴含量的增加而提高;随着钴含量的不断增加,镍钴合金在单向拉伸过程中的应力诱发晶粒
长大被逐渐抑制,提高加工硬化率,塑性失稳被延迟,从而提高塑性。
关键词:镍钴合金;纳米晶;力学性能;晶粒长大;变形机制
中图分类号:TG 文献标识码:A

Effect of Co content on structures and mechanical properties of
electrodeposited nanocrystalline Ni-Co alloys

XU Wei-chang1, DAI Pin-qiang1, 2, ZHENG Yao-dong1

(1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;
2. Department of Materials Science and Engineering, College of Fujian Engineering, Fuzhou 350108, China)

Abstract: Ni-Co alloys with Co content varying from % to % were prepared by pulse electrodeposition
nanocrystalline. The microstructures of the nanocrystalline Ni-Co alloys were characterized by XRD and TEM. The
analysis of XRD indicates that nanocrystalline Ni-Co alloys are all face-centered cubic structure, single-phase solid
solution with an average gr