In-situ oxide particles reinforced Fe40Mn40Co10Cr10 high-entropy alloy by internal oxidation and powder forging 
Tinghui Cao, Yake Wu, Jin Tian, Feng Jiang ⁎, Jun Sun
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China 
A method combining internal oxidation and powder forging was used to fabricate Fe40Mn40Co10Cr10 high- entropy alloy (HEA), in which submicro-scaled oxide particles were in-situ formed and distributed uniformly in the matrix to improve the mechanical property. The prepared HEA achieved an excellent combination of yield strength 821 MPa, ultimate tensile strength 1009 MPa and fracture elongation 28.5% at room temperature and showed good thermal stability at high temperatures, exhibiting better strength-ductility synergy than those pre- pared by the conventional powder metallurgical methods. Compared to the non-internal oxidation alloy, the in- creased yield strength was mainly due to the higher density dislocation and finer grains which were both attrib- uted to the presence of the oxide particles. Further analysis revealed the deformation mechanism of this HEA to be mainly controlled by dislocation slipping. The proposed method was applicable to various alloy systems to fabricate high-performance oxide-strengthened materials.