Enhanced strength of a high-conductivity Cu-Cr alloy by Sc addition  

作　　者：Tao Huang Chao-Min Zhang Ying-Xuan Ma Shu-Guo Jia Ke-Xing Song Yan-Jun Zhou Xiu-Hua Guo Zhen-Peng Xiao Hui-Wen Guo 

机构地区：[1]School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China [2]Henan Key Laboratory of Non-Ferrous Materials Science and Processing Technology,Luoyang 471023,China [3]Henan Academy of Sciences,Zhengzhou 450046,China [4]Henan Key Laboratory of Advanced Conductor Materials,Zhengzhou 450046,China [5]Chinaclo Luoyang Copper Processing Co.Ltd.,Luoyang 471023,China

出　　处：《Rare Metals》2024年第11期6054-6067,共14页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52173297,52071133 and U21A2051);Zhongyuan Scholar Workstation Funded Project(Nos.214400510028 and 224400510025);R&D Projects of Henan Academy of Sciences(No.220910009);the Natural Science Foundation of Henan Province(No.202300410139);the Key Scientific Research Projects of Colleges and Universities in Henan Province(No.24A430015);Henan Provincial Key Research and Development Program(No.231111231700);Beijing Nova Program(No.20230484371);Zhongyuan Youth Talent Support Program(No.202311);the Science and Technology R&D Plan Joint Fund of Henan Province(No.225200810052);the Key scientific research projects of colleges and universities in Henan province(No.23A43008)。

摘　　要：A new Cu-Cr-Sc alloy was designed,prepared and subjected to deformation heat treatment.Transmission electron microscopy(TEM),electron backscatter diffraction(EBSD)and X-ray diffraction(XRD)were employed to investigate the effects of Sc on the microstructural changes in the Cu-Cr alloy in different states,examine the changes in the precipitates during aging,reveal the intrinsic correlation between the structure and property in the peak aging state,and evaluate the Sc distribution in the Cu-Cr alloy.The addition of Sc significantly increased the yield strength of the Cu-Cr alloy by~24.6%after aging at 480℃for 1 h,while it had a high electrical conductivity of81.5%international annealed copper standard(IACS).This enhancement was attributed to the effective inhibition of Cr phase coarsening and recrystallization through the addition of Sc,which strengthened the alloy.Furthermore,in the Cu-Cr-Sc alloy,most of the Sc atoms precipitated as the Cu_(4)Sc phase,with a small amount of Sc segregating at the grain boundaries to pin them.This grain boundary pinning helped to inhibit grain growth and further improve the strength.The main strengthening mechanisms identified in Cu-Cr-Sc alloys were dislocation strengthening and precipitation strengthening.

关 键 词：Cu-Cr-Sc alloy High strength and high conductivity Precipitation strengthening Cr precipitates 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]