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International Journal for Multiscale Computational Engineering
Facteur d'impact: 1.016 Facteur d'impact sur 5 ans: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2011002152
pages 109-116

DYNAMICS OF NANOSCALE VOID-FIBER ASSEMBLY FOR MATION INIRRADIATED AMORPHOUS MATERIALS

Kun-Dar Li
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109; Department of Nuclear Engineering & Radiological Science, University of Michigan, Ann Arbor, Michigan 48109
Qiangmin Wei
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
Lumin Wang
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109; Department of Nuclear Engineering & Radiological Science, University of Michigan, Ann Arbor, Michigan 48109
Wei Lu
University of Michigan

RÉSUMÉ

Ion beam experiments have revealed an intriguingobservation that a nanoscale porous structure containing uniformlysized nanofibers can form spontaneously in preamorphizedgermanium. Depending on the ion energy and ion dose, thenanoporous fiber assembly can either be exposed from the samplesurface or embedded under an intact surface cover. This paperproposes a phase field model that describes the dynamic processfor the formation of such a structure in an amorphous matrix. Inthis model, vacancies in an amorphous matrix are defined by localreduction of atomic density relative to the reference solid beforeirradiation, and the cavity is treated as a phase with the vacancyconcentration close to one. It is shown that interface migrationtogether with the competing actions between vacancy production andannihilation determines the morphology of irradiated material.The model suggests that with continuous supply of vacanciesthrough increasing irradiation doses, the morphology evolves intoa network structure composed of nearly uniform sizes ofnanofibers. The morphology and characteristic wavelengthpredicted by the model are consistent with experimentalobservations. The model also well predicts the effects of ionflux, temperature, and material properties on the uniquenanostructure evolution under irradiation.

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