期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.05.003
关键词
Cu-Cr-Ni-Co-Si; Multi-step thermo-mechanical treatment; Precipitate
类别
资金
- National Key Research and Development Program of China [2016YFB0301300]
- National Natural Science Foundation of China [U1637210]
- Project of Fundamental Research [2018zzts324]
- Project of State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
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.
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