Abstract
To overcome the dimension limits of immiscible alloys produced by traditional techniques and enhance their mechanical properties,bulk Cu-Fe-based immiscible alloy with abundant nanotwins and stacking faults was successfully produced by selective laser melting(SLM).The SLM-produced bulk immiscible alloy displays a heterogeneous microstructure characterized by micro-scaled y-Fe particles dispersed in fine ε-Cu matrix with a high fraction(～92％)of high-angle grain boundaries.Interestingly,abundant nan-otwins and stacking faults are generated in the interior of nano-scaled y-Fe particles embedded withinε-Cu matrix.The heterogeneous interface of soft domains(ε-Cu)and hard domains(y-Fe)not only in-duces the geometrically necessary dislocations(GNDs)but also affects the dislocation propagation during plastic deformation.Therefore,the bimodal heterogeneous interface,and the resistance of nanotwins and stacking faults to the propagation of partial dislocation make the bulk immiscible alloy exhibit an en-hanced strength of～590 MPa and a good ductility of～8.9％.
基金项目
Projects of MOE Key Lab of Disaster Forecast and Control in Engineering in Jinan Uni-versity(20200904006)
Guangdong Basic and Applied Basic Research Foundation(2020B1515420004)
NETL
NSTL
维普
万方数据