A D019 precipitate strengthened laser additively manufactured V and Nb bearing CoCrFeNi based high entropy alloys

• DOI: 10.1016/j.matdes.2023.112464
• Publication Date: 2023-11-08T09:30:46Z
• Authors: Jiawang Wu; Yaxiong Guo; Fangping Wang; Xiaojuan Shang; Jing Zhang; Qibin Liu
• Keywords: Equiaxed crystals; High-Entropy Alloys; Ductility (Earth science); Volume fraction

Two novel HEA compositions of [Nb¯-(FeCoNi)12]Cr3 (Nb¯= Nb, V) was designed using a high-entropy alloying strategy by analyzing traditional IN718 superalloy based on cluster-plus-glue-atom model. And their thin-wall-shaped bulks were prepared laser additive manufacturing, with an emphasis the effects V atoms to substitute for Nb microstructures and mechanical properties. Also, strengthening mechanism induced D019 precipitates as-aged V2Nb4 discussed. After contents inter-dendritic C14-Laves phases are effectively inhibited. The ductility is significantly improved small sacrifice strength (i.e., σb ∼ 851 MPa δ 16.8 % HEA). aging treatment, main microstructure transforms from fine dendrites recrystallized equiaxed grains. intercrossed needle-shaped volume fraction 7.2% uniformly distributed in FCC matrix, which hinders dislocation slip. Thereto, as-96-hr-aged exhibits most excellent strength-ductility trade-off (e.g., σs ∼721.5 MPa, ∼979.5 sufficient 7.5%). above findings provide references development LAM high-performance HEAs originating alloys.