Observation of Transient and Asymptotic Driven Structural States of Tungsten Exposed to Radiation.
Phys Rev Lett
; 125(22): 225503, 2020 Nov 27.
Article
en En
| MEDLINE
| ID: mdl-33315460
ABSTRACT
Combining spatially resolved x-ray Laue diffraction with atomic-scale simulations, we observe how ion-irradiated tungsten undergoes a series of nonlinear structural transformations with increasing radiation exposure. Nanoscale defect-induced deformations accumulating above 0.02 displacements per atom (dpa) lead to highly fluctuating strains at â¼0.1 dpa, collapsing into a driven quasisteady structural state above â¼1 dpa. The driven asymptotic state is characterized by finely dispersed vacancy defects coexisting with an extended dislocation network and exhibits positive volumetric swelling, due to the creation of new crystallographic planes through self-interstitial coalescence, but negative lattice strain.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2020
Tipo del documento:
Article
País de afiliación:
Reino Unido