Abstract
Laser powder bed fusion(LPBF)is a promising method for manufacturing functional and structural inte-grated Cu-Cr-Zr components.However,the LPBF-processed Cu-Cr-Zr alloys still suffer from the strength-ductility trade-off dilemma,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 ag-ing treatment,the hierarchical structure was composed of melt tracks at the macroscale,coarse grains(31.9±0.1 μm)and fine grains(5.6±0.2 μm)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 hetero-geneous deformation-induced stress caused by the hierarchical structure not only led to a large increase in yield strength but also promoted tensile ductility.
基金项目
National Natural Science Foundation of China(52127802)
National Natural Science Foundation of China(51834009)
Science and Technology Project of Xi'an(2021SFGX0004)
NETL
NSTL
万方数据