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Deformation and spallation of shocked Cu bicrystals with Σ3 coherent and symmetric incoherent twin boundaries

Han, W. Z. and An, Q. and Luo, S. N. and Germann, T. C. and Tonks, D. L. and Goddard, W. A., III (2012) Deformation and spallation of shocked Cu bicrystals with Σ3 coherent and symmetric incoherent twin boundaries. Physical Review B, 85 (2). Art. No. 024107. ISSN 1098-0121. doi:10.1103/PhysRevB.85.024107.

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We perform molecular dynamics simulations of Cu bicrystals with two important grain boundaries (GBs), Σ3 coherent twin boundaries (CTB), and symmetric incoherent twin boundaries (SITB) under planar shock wave loading. It is revealed that the shock response (deformation and spallation) of the Cu bicrystals strongly depends on the GB characteristics. At the shock compression stage, elastic shock wave can readily trigger GB plasticity at SITB but not at CTB. The SITB can induce considerable wave attenuation such as the elastic precursor decay via activating GB dislocations. For example, our simulations of a Cu multilayer structure with 53 SITBs (∼1.5-μm thick) demonstrate a ∼80% elastic shock decay. At the tension stage, spallation tends to occur at CTB but not at SITB due to the high mobility of SITB. The SITB region transforms into a threefold twin via a sequential partial dislocation slip mechanism, while CTB preserves its integrity before spallation. In addition, deformation twinning is a mechanism for inducing surface step during shock tension stage. The drastically different shock response of CTB and SITB could in principle be exploited for, or benefit, interface engineering and materials design.

Item Type:Article
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An, Q.0000-0003-4838-6232
Goddard, W. A., III0000-0003-0097-5716
Additional Information:© 2012 American Physical Society. Received 31 October 2011; revised 21 December 2011; published 11 January 2012. This work was supported by ASC/LDRD programs at LANL and the PSAAP project at Caltech. LANL is operated by Los Alamos National Security, LLC for the US Department of Energy under Contract No. DE-AC52-06NA25396.
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Los Alamos National LaboratoryUNSPECIFIED
Department of Energy (DOE)DE-AC52-06NA25396
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Issue or Number:2
Classification Code:PACS: 61.72.Mm, 62.50.Ef, 61.72.Hh, 62.20.F-
Record Number:CaltechAUTHORS:20120206-123431844
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29153
Deposited By: Jason Perez
Deposited On:06 Feb 2012 22:13
Last Modified:09 Nov 2021 17:04

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