Study on oxide precipitations and their interaction with dislocations in laser powder bed fusion Mo-Re alloys

In this study, crack-free and highly dense Mo-Re alloys were successfully fabricated using the laser powder bed fusion (L-PBF) additive manufacturing process. The fabricated alloys exhibited excellent mechanical properties at room temperature. During the L-PBF process, oxides ranging from micron to nanometer sizes were observed within the alloy matrix. These oxides were uniformly distributed and showed no grain boundary segregation. After deformation, the interaction between these oxides and dislocations was confirmed via the transmission electron microscopy investigations. The interaction between oxides and dislocations might play a significant role in enhancing the ductility of the alloy.