中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 12 December 2023 |
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:A Cu-1.3Ni-1.2Co-0.7Si-0.3Cr-0.1Mg alloy with high strength and medium conductivity was designed and prepared. The effects of multistage thermomechanical treatment on the microstructure and properties of the alloy and its strengthening mechanism were studied. The results showed that a large number of nanoscale β-Ni3Si, δ-(Ni,Co)2Si and Cr phase particles precipitated in the high-density dislocation region and sub-grain boundaries during aging, and submicron Cr3Si phase particles formed during solidification of the alloy. The tensile strength, yield strength and electrical conductivity of the alloy were 882 MPa, 857 MPa and 46.7% (IACS), respectively. The main strengthening mechanisms of the alloy were precipitation strengthening, strain strengthening and sub-structure strengthening through the strengthening model calculation and measured strength.
Key words: multicomponent alloying; microstructure evolution; precipitated phase; properties; strengthening mechanism
