Strength-ductility synergy in a hierarchical Cu-Cr-Zr alloy processed via laser powder bed fusion  

作　　者：Wenjun Ma Fei Cao Lei Gao Yihui Jiang Zheng Chen Hao Shi Yanfang Wang Shuhua Liang 

机构地区：[1]School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China [2]Engineering Research Center of Conducting Materials and Composite Technology,Ministry of Education,Xi’an 710048,China [3]Shaanxi Province Key Laboratory of Electrical Materials and Infiltration Technology,Xi’an 710048,China

出　　处：《Journal of Materials Science & Technology》2024年第24期122-133,共12页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.52127802 and 51834009);the Science and Technology Project of Xi’an(No.2021SFGX0004).

摘　　要：Laser powder bed fusion(LPBF)is a promising method for manufacturing functional and structural integrated Cu-Cr-Zr components.However,the LPBF-processed Cu-Cr-Zr alloys still suffer from the strength-ductility trade-offdilemma,while maintaining high conductivity.Here,LPBF-processed Cu-Cr-Zr alloy with a hierarchical structure was obtained by increasing the Cr and Zr content simultaneously.After aging treatment,the hierarchical structure was composed of melt tracks at the macroscale,coarse grains(31.9±0.1μm)and fine grains(5.6±0.2μm)at the microscale,high-density of dislocations and dual precipitates at the nanoscale.The direct aged sample exhibited an excellent combination of strength and ductility(tensile strength was enhanced to 626±1 MPa and uniform elongation of 16.2%±1.1%),which is superior to the traditionally wrought and LPBF-processed Cu-Cr-Zr alloys reported previously.Meantime,a good electrical conductivity of 71.1%±0.3%IACS was also achieved.In addition,the heterogeneous deformation-induced stress caused by the hierarchical structure not only led to a large increase in yield strength but also promoted tensile ductility.

关 键 词：Additive manufacturing Cu-Cr-Zr alloy Laser powder bed fusion Hierarchical structure Strength-ductility synergy 

分 类 号：TG146.13[一般工业技术—材料科学与工程]