Abstract
? 2022 Elsevier B.V.In the present study, the Co9Al8W superalloy was used as a binder phase for a new tungsten heavy alloy (WHA). The effects of the binder phase, nano-Y2O3 oxides, and mechanical alloying on the microstructure evolution and mechanical properties of the model WHAs were investigated. The results demonstrate that the presence of the Co9Al8W binder phase can stabilize the formation of solid phase during sintering. The dispersed oxide particles can interact with the Al element and form complex nanoscale Al-Y-O oxides, which greatly refine the microstructure, resulting in a significant impact on mechanical properties of the alloys. However, the porous microstructure related to Al-rich oxides and pores was obtained in the alloys, which caused the formation of micro-cracks, resulting in the loss of material ductility.
NSTL
Elsevier