Outstanding radiation resistance of tungsten-based high-entropy alloys
Osman El-Atwani , Li Nan , Li Meimei , Arun Devaraj , Jon K.S. Baldwin , M. M. Schneider , D. Sobieraj , Jan Wróbel , D. Nguyen-Manh , S. A. Maloy , E. Martinez
AbstractA body-centered cubic W-based refractory high entropy alloy with outstanding radiation resistance has been developed. The alloy was grown as thin films showing a bimodal grain size distribution in the nanocrystalline and ultrafine regimes and a unique 4-nm lamella-like structure revealed by atom probe tomography (APT). Transmission electron microscopy (TEM) and x-ray diffraction show certain black spots appearing after thermal annealing at elevated temperatures. TEM and APT analysis correlated the black spots with second-phase particles rich in Cr and V. No sign of irradiation-created dislocation loops, even after 8 dpa, was observed. Furthermore, nanomechanical testing shows a large hardness of 14 GPa in the as-deposited samples, with near negligible irradiation hardening. Theoretical modeling combining ab initio and Monte Carlo techniques predicts the formation of Cr- and V-rich second-phase particles and points at equal mobilities of point defects as the origin of the exceptional radiation tolerance.
|Journal series||Science advances, ISSN 2375-2548, e-ISSN 2375-2548|
|Keywords in Polish||Stopy o wysokiej entropii, właściwości radiacyjne, tomografia sondy atomowej, transmisyjna mikroskopia elektronowa, modelowanie ab initio, symulacje Monte Carlo|
|Keywords in English||high-entropy alloys, radiation properties, atom probe tomography, transmission electron microscope, ab initio modelling, Monte Carlo simulations|
|Score||= 200.0, 14-11-2019, ArticleFromJournal|
|Publication indicators||: 2018 = 12.804 (2) - 2018=13.293 (5)|
|Citation count*||33 (2020-06-06)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.