Effects of Cryorolling on Properties and Precipitation Behavior of a High-Strength and High-Conductivity Cu-1Cr-0.2Zr-0.25Nb Alloy
Received date: 2022-04-17
Revised date: 2022-05-16
Online published: 2022-07-19
Supported by
National Natural Science Foundation of China(51971052);National Natural Science Foundation of China(51927801);National Natural Science Foundation of China(51690163);National Natural Science Foundation of China(52001161);Liaoning Revitalization Talents Program(XLYC2007183);Innovation Foundation of Science and Technology of Dalian City(2020JJ25CY002);Innovation Foundation of Science and Technology of Dalian City(2020JJ26GX045)
The performance requirements for copper alloys are increasing with the rapid development of transportation, electrical, aerospace, and electronics in modern industry. Cu-Cr-Zr alloy has exceptional strength and electrical conductivity as typical precipitation strengthening copper alloy. Strength and conductivity are mutually exclusive properties. The goal of realizing the high strength and conductivity of copper is a crucial subject in modern copper industry development. In this study, the effects of cryorolling on the microstructure, mechanical properties, and electrical conductivity of Cu-1Cr-0.2Zr-0.25Nb alloy were examined and the effects of numerous aging processes on the type, morphology, and distribution of precipitates were investigated. The findings depict that the Cu-1Cr-0.2Zr-0.25Nb alloy primarily comprised the Cr phase, Zr-rich phase, Cr2Nb phase, and Cu matrix phase. The fcc Cr nanoprecipitates can be precipitated in Cu-1Cr-0.2Zr-0.25Nb alloy after aging at 450oC for 30 min. The bcc Cr nanoprecipitates can be formed after aging at 450oC for 300 min. After cryorolling and aging treatment, the mixed structures, such as nanoprecipitation phase, nanodeformation twins, and dislocations in the Cu-1Cr-0.2Zr-0.25Nb alloy are produced and this alloy demonstrates remarkable comprehensive properties. The tensile strength of 700 MPa and electrical conductivity of 73.29%IACS were attained for the cryorolled Cu-1Cr-0.2Zr-0.25Nb alloy after aging at 450oC for 30 min; after aging at 450oC for 300 min, the conductivity can reach 79.81%IACS, and the corresponding tensile strength, yield strength, and hardness are 646 MPa, 606 MPa, and 212 HV, respectively. Combining the experimental findings with the computations of contribution to strengthening, it can reasonably be inferred that dislocation and precipitation strengthening were the primary strengthening mechanisms of Cu-1Cr-0.2Zr-0.25Nb alloy.
LI Longjian , LI Rengeng , ZHANG Jiajun , CAO Xinghao , KANG Huijun , WANG Tongmin . Effects of Cryorolling on Properties and Precipitation Behavior of a High-Strength and High-Conductivity Cu-1Cr-0.2Zr-0.25Nb Alloy[J]. Acta Metall Sin, 2024 , 60(3) : 405 -416 . DOI: 10.11900/0412.1961.2022.00180
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