首页|Strength-ductility synergy in a hierarchical Cu-Cr-Zr alloy processed via laser powder bed fusion
Strength-ductility synergy in a hierarchical Cu-Cr-Zr alloy processed via laser powder bed fusion
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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.
Additive manufacturingCu-Cr-Zr alloyLaser powder bed fusionHierarchical structureStrength-ductility synergy
NETL
NSTL
万方数据
