Effect of Milling Duration on Oxide-Formation Behavior of Oxide-Dispersion-Strengthened High-Entropy Alloys

EffEct of Milling Duration on oxiDE-forMation BEhavior of oxiDE-DispErsion-strEngthEnED high-Entropy alloysoxide-dispersion-strengthened high-entropy alloys were produced by hot-pressing a ball-milled mixture of Y 2 o 3 and atomized CoCrFemnNi powder.The effect of milling duration on grain size reduction, oxide formation behavior, and the resulting mechanical properties of the alloys was studied.Both the alloy powder size and Y 2 o 3 particle size decreased with milling time.moreover, the alloy powder experienced severe plastic deformation, dramatically generating crystalline defects.As a result, the grain size was reduced to ~16.746 nm and in-situ second phases (e.g., mno 2 and σ phase) were formed at the defects.This increased the hardness of the alloys up to a certain level, although excessive amounts of in-situ second phases had the reverse effect.