Observation of transient and asymptotic driven structural states of tungsten exposed to irradiation
arXiv:2007.15376 · doi:10.1103/PhysRevLett.125.225503
Abstract
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.
arXiv comment9 pages, 9 figures, in print with PRL
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Cited by in corpus (10)
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- Dislocation density transients and saturation in irradiated zirconium
- Non-destructive study of collision cascade damage in self-ion irradiated tungsten using HR-EBSD and ECCI
- Volume of a dislocation network
- Simulated TEM imaging of a heavily irradiated metal
- Dependence of simulated radiation damage on crystal structure and atomic misfit in metals
- Compressing and forecasting atomic material simulations with descriptors
- Atomic-level study of dose-dependent lattice thermal conductivity degradation in irradiated tungsten