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Thermal Stability of Helium-Vacancy Clusters and Bubble Formation - Multiscale Modeling Approach for Fusion Materials Development

Kazunori Morishita, Ryuichiro Sugano, Brian D. Wirth

Fusion Science and Technology

Volume 44 / Number 2 / September 2003 / Pages 441-445


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The recent progress on our multiscale modeling to understand radiation damage processes in materials during irradiation is reviewed. The energies of He-V cluster formation in Fe were evaluated using a molecular dynamics (MD) simulation technique that employed interatomic potentials partially developed by first-principle (FP) calculations. Using the calculated energies, the longer timescale behavior of He-V clusters in Fe was investigated using a kinetic Monte-Carlo (KMC) simulation technique. The FP-MD-KMC scheme provided us significant information on the thermal stability of a He-V cluster in Fe as a function of the helium-to-vacancy ratio of the cluster.

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