The effect of composition on helium bubble nucleation in complex concentrated alloys

McCarthy, M. J.; Karl, K. M.; Cusentino, M. A.

doi:10.1063/5.0255636

The effect of composition on helium bubble nucleation in complex concentrated alloys

Journal Article · Mon May 05 00:00:00 EDT 2025 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0255636· OSTI ID:2564500

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Molecular dynamics simulations of helium implantation have been performed in the MoNbTaTi complex concentrated alloy (CCA) to determine the impact of composition on helium clustering and bubble nucleation. It was found that compositions with lower interstitial atomic volume resulted in smaller cluster sizes, higher helium-to-vacancy ratios, and larger migration barriers. As the atomic volume decreases, it is harder to accommodate additional helium in the lattice and for helium to diffuse between interstitial sites, resulting in smaller cluster sizes. In particular, increasing molybdenum directly correlated with a decreased interstitial atomic volume and increased migration barrier. Niobium exhibited the opposite trend, where more niobium in the material resulted in larger interstitial atomic volumes and cluster sizes but lower migration barriers. The atomic volume was determined to be an indicator of the susceptibility of the material to helium bubble growth and could potentially be used as a metric to screen compositions for resistance to helium damage. In this way, properties such as available interstitial volumes could be used to screen materials more rapidly given the vast compositional space of CCAs.

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Sponsoring Organization:: USDOE

OSTI ID:: 2564500

Alternate ID(s):: OSTI ID: 2585693
OSTI ID: 2584138

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 17 Vol. 137; ISSN 0021-8979

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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