Observation of transient and asymptotic driven structural states of tungsten exposed to irradiation

Observation of transient and asymptotic driven structural states of tungsten exposed to irradiation

Observation of transient and asymptotic driven structural states of tungsten exposed to irradiation 150 150 amit lakhani
UKAEA-CCFE-PR(20)113

Observation of transient and asymptotic driven structural states of tungsten exposed to irradiation

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 defects coexisting with an extended dislocation network and exhibits positive volumetric swelling but negative lattice strain.

   

Collection:
Journals
Journal:
Physical Review Letters
Publisher:
APS (American Physical Society)