Observation of transient and asymptotic driven structural states of tungsten exposed to radiation
Autor: | D R Mason, Ruqing Xu, Hongbing Yu, Peter M. Derlet, Nicholas W. Phillips, David Yang, Felix Hofmann, Sergei L. Dudarev, Kenichiro Mizohata, Andrew J. London, Suchandrima Das |
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Přispěvatelé: | Materials Physics |
Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Coalescence (physics)
Condensed Matter - Materials Science Materials science Spatially resolved fungi Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy chemistry.chemical_element Tungsten Radiation 114 Physical sciences 01 natural sciences Molecular physics 3. Good health Lattice strain Radiation exposure Condensed Matter::Materials Science chemistry Vacancy defect 0103 physical sciences X-ray crystallography 010306 general physics |
Zdroj: | Physical Review Letters |
DOI: | 10.1103/physrevlett.125.225503 |
Popis: | Combining spatially resolved X-ray Laue diffraction with atomic-scale simulations, we observe how ion-irradiated tungsten undergoes a series of non-linear structural transformations with increasing irradiation exposure. Nanoscale defect-induced deformations accumulating above 0.02 displacements per atom (dpa) lead to highly fluctuating strains at ~0.1 dpa, collapsing into a driven quasi-steady structural state above ~1 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. Comment: 9 pages, 9 figures, in print with PRL |
Databáze: | OpenAIRE |
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