Microstructure and Mechanical Properties of Multi-principal component FeCoCrNiMo_x High Entropy Alloy

Abstract High entropy alloy is considered a kind of structural and functional materials with wide application prospects. In the present work, FeCrCoNiMo x was prepared and used as a research object. The influence of Mo with a large atomic radius on crystal structure, microstructure, and mechanical properties was discussed and the variation of microstructure and properties with composition was clarified. The microstructure of the alloy changes gradually from single phase FCC centered cubic solid solution structure to FCC + σ phase and FCC + σ + μ phase with increasing Mo content. The microstructure of FeCrCoNiMo x also gradually changes from uniaxial crystal to dendrite and the hardness of FeCrCoNiMo x changes with the change of FeCrCoNiMo x microstructure. FeCrCoNiMo 0.6 alloy has the highest hardness, reaching 375 HV.