材料科学
微观结构
等轴晶
延展性(地球科学)
高熵合金
冶金
复合材料
蠕动
作者
Jiawang Wu,Yaxiong Guo,Fangping Wang,Qibin Liu,Jing Zhang,Qibin Liu
标识
DOI:10.1016/j.matdes.2023.112464
摘要
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 a cluster-plus-glue-atom model. And their thin-wall-shaped bulks were prepared by laser additive manufacturing, with an emphasis on the effects of using V atoms to substitute for Nb atoms on their microstructures and mechanical properties. Also, the strengthening mechanism induced by D019 precipitates of as-aged V2Nb4 HEA was discussed. After using V to substitute for Nb, the contents of inter-dendritic C14-Laves phases are effectively inhibited. The ductility is significantly improved with a small sacrifice of strength (i.e., σb ∼ 851 MPa and δ ∼ 16.8 % for V2Nb4 HEA). After aging treatment, the main microstructure transforms from fine dendrites to recrystallized equiaxed grains. The intercrossed needle-shaped D019 precipitates with a volume fraction of 7.2% are uniformly distributed in the FCC matrix, which hinders the dislocation slip. Thereto, the as-96-hr-aged V2Nb4 HEA exhibits the most excellent strength-ductility trade-off (e.g., σs ∼721.5 MPa, σb ∼979.5 MPa with a sufficient ductility of 7.5%). The above findings provide references for the development of LAM high-performance HEAs originating from traditional alloys.
科研通智能强力驱动
Strongly Powered by AbleSci AI