Intergranular fracture in nanocrystalline metals

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TR Number
Date
2002-08-01
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract

Crack propagation studies in nanocrystalline Ni samples with mean grain sizes ranging from 5 to 12 nm are reported using atomistic simulations. For all grain sizes pure intergranular fracture is observed. Intergranular fracture is shown to proceed by the coalescence of microvoids formed at the grain boundaries ahead of the crack. The energy released during propagation is higher than the Griffith value, indicating an additional grain-boundary accommodation mechanism.

Description
Keywords
Molecular dynamics, Plastic behavior, Physics, Condensed matter
Citation
Farkas, D.; Van Swygenhoven, H.; Derlet, P. M., "Intergranular fracture in nanocrystalline metals," Phys. Rev. B 66, 060101(R) DOI: http://dx.doi.org/10.1103/PhysRevB.66.060101