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Elastic and plastic anisotropy after straining of nanocrystalline palladium

: Bachurin, D.V.; Gumbsch, P.

Preprint urn:nbn:de:0011-n-1986917 (2.2 MByte PDF)
MD5 Fingerprint: 651f8490f80ffe0a548e0c9b1e4d2114
Erstellt am: 7.5.2016

Physical Review. B 85 (2012), Nr.8, Art.085407, 9 S.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Deutsche Forschungsgemeinschaft DFG
FOR 714; Gu 367/30
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()

Atomistic simulations of uniaxial straining of three-dimensional nanocrystalline palladium along different loading paths were performed at room temperature and at a constant strain rate of 10(8) s(-1). It is found that both the elastic behavior and plastic behavior of the specimen display a pronounced anisotropy after some deformation. Surprisingly, the Young's modulus can significantly change with the deformation history of the sample. Some of these changes are found to be reversible. They either relax or can be removed by applying the opposite deformation. A mechanism based on excess-free-volume migration in the grain boundaries is proposed to explain such behavior.