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Shock-induced consolidation and spallation of Cu nanopowders

Huang, L. and Han, W. Z. and An, Q. and Goddard, W. A., III and Luo, S. N. (2012) Shock-induced consolidation and spallation of Cu nanopowders. Journal of Applied Physics, 111 (1). Art. No. 013508. ISSN 0021-8979.

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A useful synthesis technique, shock synthesis of bulk nanomaterials from nanopowders, is explored here with molecular dynamics simulations. We choose nanoporous Cu (∼11 nm in grain size and 6% porosity) as a representative system, and perform consolidation and spallation simulations. The spallation simulations characterize the consolidated nanopowders in terms of spall strength and damage mechanisms. The impactor is full density Cu, and the impact velocity (u_i) ranges from 0.2 to 2 km s^(−1). We present detailed analysis of consolidation and spallation processes, including atomic-level structure and wave propagation features. The critical values of u_i are identified for the onset plasticity at the contact points (0.2 km s^(−1)) and complete void collapse (0.5 km s^(−1)). Void collapse involves dislocations, lattice rotation, shearing/friction, heating, and microkinetic energy. Plasticity initiated at the contact points and its propagation play a key role in void collapse at low u_i, while the pronounced, grain-wise deformation may contribute as well at high u_i. The grain structure gives rise to nonplanar shock response at nanometer scales. Bulk nanomaterials from ultrafine nanopowders (∼10 nm) can be synthesized with shock waves. For spallation, grain boundary (GB) or GB triple junction damage prevails, while we also observe intragranular voids as a result of GB plasticity.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
An, Q.0000-0003-4838-6232
Goddard, W. A., III0000-0003-0097-5716
Additional Information:© 2012 American Institute of Physics. Received 3 November 2011; accepted 26 November 2011; published online 5 January 2012. This work is supported by Natural Science Foundation of China under Grant No. 10904023 (L.H.), and the PSAAP project at Caltech (Q.A. and W.A.G.). Los Alamos National Laboratory (LANL) is operated by Los Alamos National Security, LLC for the U.S. Department of Energy (DOE) under contract No. DE-AC52-06NA25396.
Funding AgencyGrant Number
Natural Science Foundation of China10904023
Los Alamos National LaboratoryUNSPECIFIED
Department of Energy (DOE)DE-AC52-06NA25396
Subject Keywords:copper, crystal microstructure, deformation, dislocations, friction, grain boundaries, heat treatment, molecular dynamics method, nanofabrication, nanoparticles, nanoporous materials, plasticity, shock wave effects, voids (solid)
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Other Numbering System NameOther Numbering System ID
Issue or Number:1
Classification Code:PACS: 81.16.-c; 81.07.Wx; 62.50.Ef; 81.05.Bx; 81.40.Lm; 62.20.fq
Record Number:CaltechAUTHORS:20120215-073753625
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Official Citation:Shock-induced consolidation and spallation of Cu nanopowders L. Huang, W. Z. Han, Q. An, W. A. Goddard, III, and S. N. Luo J. Appl. Phys. 111, 013508 (2012); (6 pages)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29292
Deposited By: Ruth Sustaita
Deposited On:15 Feb 2012 15:58
Last Modified:03 Oct 2019 03:40

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