Microstructure and properties of a Cu-Ni-Si-Co-Cr alloy with high strength and high conductivity
Microstructure and properties of a Cu-Ni-Si-Co-Cr alloy with high strength and high conductivity
复制标题
DOI：
10.1016/j.msea.2019.05.003
复制
发表时间：
2019-06-24
期刊：
影响因子：
6.4
通讯作者：
Zhang, Sangjian
中科院分区：
文献类型：
--
作者：
Zhao, Zhilei;Xiao, Zhu;Zhang, Sangjian
制备了一种新型高强高导Cu-1.01%Ni-0.28%Si-0.14%Co-0.45%Cr（质量分数）合金。研究了多级形变热处理后合金的显微组织、力学性能和电学性能。该合金具有优异的综合性能，抗拉强度为810 MPa，屈服强度为777 MPa，延伸率为3.4%，电导率为57.5%IACS（国际退火铜标准）。在时效过程中，合金中形成了（Cr，Co）（2）Si、（Ni，Co）（2）Si和Cr三种析出相。Co元素的加入促进了Cr、Ni和Si溶质元素从基体中析出，抑制了（Cr，Co）（2）Si的生长。多级形变热处理合金的高强度是由于弥散强化、亚结构强化和加工硬化的共同作用。复合时效工艺和Co的加入有效地提高了合金的导电性。高强度和高导电性使其成为电子电气行业引线框架材料的潜在候选者。
A novel Cu-1.01%Ni-0.28%Si-0.14%Co-0.45%Cr (mass percent) alloy with high strength and high conductivity was fabricated. Microstructure, mechanical and electrical properties of the alloy after multi-stage thermo-mechanical treatment were investigated in detail. The alloy has excellent comprehensive properties, with a tensile strength of 810 MPa, yield strength of 777 MPa, elongation of 3.4%, and electrical conductivity of 57.5%IACS (International Annealing Copper Standard). Three kinds of precipitates, (Cr,Co)(2)Si, (Ni,Co)(2)Si and Cr, form during aging treatment. Addition of Co element promotes the precipitation of Cr, Ni and Si solute elements from the matrix, while inhibits the growth of the (Cr,Co)(2)Si. The high strength of the alloy treated by multi-stage thermo-mechanical process is attributed to the dispersion strengthening, sub-structure strengthening, and work hardening. The multi-aging process and addition of Co effectively improve the electrical conductivity of the studied alloy. The high strength and high conductivity of studied alloy make it as a potential candidate for lead frame materials in electrical and electronics industry.