首页|Irradiation damage versus lattice distortion in AlNbTiVCrx (x=0, 0.5, 1) high-entropy alloys from first-principles calculations and irradiation experiments
Irradiation damage versus lattice distortion in AlNbTiVCrx (x=0, 0.5, 1) high-entropy alloys from first-principles calculations and irradiation experiments
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Elsevier
Severe lattice distortions and rough energy landscapes were found in low-density, refractory AlNbTiVCrx (x = 0, 0.5, 1) high-entropy alloys (HEAs) via first-principles calculations. The corresponding samples were irradiated by 5 MeV Xe ions to fluences of 3.3 x 10(14) ions/cm(2) at 600 degrees C. Fundamental irradiation behaviors were studied using transmission electron microscopy and nanoindentation. No phase decomposition was found after irradiation as well as void. The irradiation-induced dislocation loop size decreases, and the density increases with the increasing Cr content. This finding is attributed to the fact that Cr aggravates lattice distortion and roughens energy landscapes in the AlNbTiVCrx system, which will interrupt the long-distance migration of self-interstitials and delay their accumulation. Nanohardness increments exhibit good consistency with the product of dislocation loop size and density. This work provides an insight into the combination of atomic simulation and irradiation experiments for better understanding of the irradiation behaviors of refractory HEAs, and a possibility to modify defect evolution by regulating the compositional complexity. (C) 2022 Elsevier B.V. All rights reserved.
High entropy alloysFirst-principles calculationsHeavy ion irradiationIrradiation defectslattice distortionTOTAL-ENERGY CALCULATIONS46.5 MEV NI6MECHANICAL-PROPERTIESSTRUCTURAL-MATERIALSMICROSTRUCTURECHALLENGESALUMINUMSIZEHEATEM
NSTL
Elsevier
