Microstructural complexity and dimensional changes in heavily irradiated zirconium

Microstructural complexity and dimensional changes in heavily irradiated zirconium

Microstructural complexity and dimensional changes in heavily irradiated zirconium 150 150 Mathew
UKAEA-CCFE-PR(21)60

Microstructural complexity and dimensional changes in heavily irradiated zirconium

Using atomistic simulations based on the creation-relaxation algorithm, we explore the evolution of microstructure in irradiated zirconium over a broad range of radiation exposure. In agreement with experimental observations, we find that at relatively low temperatures, microstructure evolves towards an asymptotic dynamic steady state forming at doses close to 1 dpa. Simulations show the spontaneous formation of a-type interstitial dislocation loops, gradually transforming into an a-type extended dislocation network and giving rise to macroscopic anisotropic dimensional changes in a textured material. A fully developed a-type interstitial/vacancy and c-type vacancy dislocation microstructure corresponds to the highest degree of irradiation growth anisotropy and vanishingly small volumetric swelling of the material.

Collection:
Journals
Journal:
Physical Review Materials
Publisher:
APS (American Physical Society)
Published date:
03/11/2021