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

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

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A new Cu-Cr-Sc alloy was designed,prepared and subjected to deformation heat treatment.Transmission electron microscopy(TEM),electron backscatter diffrac-tion(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 of 81.5％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 Cu4Sc 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 pre-cipitation strengthening.

Cu-Cr-Sc alloyHigh strength and high conductivityPrecipitation strengtheningCr precipitates

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

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School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China

Henan Key Laboratory of Non-Ferrous Materials Science and Processing Technology,Luoyang 471023,China

Henan Academy of Sciences,Zhengzhou 450046,China

Henan Key Laboratory of Advanced Conductor Materials,Zhengzhou 450046,China

Chinaclo Luoyang Copper Processing Co.Ltd.,Luoyang 471023,China

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2024

10.1007/s12598-024-02947-8

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(11)