Dislocation processes and deformation twinning in nanocrystalline Al.

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Using a recently developed, massively parallel molecular-dynamics (MD) code for the simulation of polycrystal plasticity, we analyze for the case of nanocrystalline Al the complex interplay among various dislocation and grain-boundary processes during low-temperature deformation. A unique aspect of this work, arising from our ability to deform to rather large plastic strains and to consider a rather large grain size, is the observation of deformation under very high grain-boundary and dislocation densities, i.e., in a deformation regime where they compete on an equal footing. We are thus able to identify the intra- and intergranular dislocation and grain-boundary processes responsible for ... continued below

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4 pages

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Yamakov, V.; Wolf, D.; Phillpot, S. R. & Gleiter, H. January 29, 2002.

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Using a recently developed, massively parallel molecular-dynamics (MD) code for the simulation of polycrystal plasticity, we analyze for the case of nanocrystalline Al the complex interplay among various dislocation and grain-boundary processes during low-temperature deformation. A unique aspect of this work, arising from our ability to deform to rather large plastic strains and to consider a rather large grain size, is the observation of deformation under very high grain-boundary and dislocation densities, i.e., in a deformation regime where they compete on an equal footing. We are thus able to identify the intra- and intergranular dislocation and grain-boundary processes responsible for the extensive deformation twinning observed in our simulations. This illustrates the ability of this type of simulations to capture novel atomic-level insights into the underlying deformation mechanisms not presently possible experimentally. smaller grain size, mobile dislocations must be nucleated from other sources, such as the GBs or grain junctions.

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4 pages

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  • ICCN 2002, San Juan (PR), 04/22/2002--04/25/2002

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  • Report No.: ANL/MSD/CP-106308
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 793905
  • Archival Resource Key: ark:/67531/metadc734106

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  • January 29, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • Dec. 14, 2015, 11:18 a.m.

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Yamakov, V.; Wolf, D.; Phillpot, S. R. & Gleiter, H. Dislocation processes and deformation twinning in nanocrystalline Al., article, January 29, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc734106/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.