• Scripta Materialia - Article in Press, Accepted Manuscript - [Scripta Materialia]

    2008-12-09

     

    Mechanics of nanoscale metallic multilayers: from atomic-scale to micro-scale

    J. Wanga, R.G. Hoaglanda and A. Misrab

    aMaterials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAbCenter for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA 

    Received 30 September 2008; revised 15 November 2008; accepted 18 November 2008. Available online 7 December 2008.

    Tag：Misra_A Hoagland_RG
    Steven 发表于09:04:14 | 阅读全文 | 评论 0 | 编辑 | 分享 0

  • Acta Materialia - Volume 56, Issue 13, Pages 2929-3312 (August 2008 - [Acta Materialia]

    2008-06-29

     

    1.Interface and surface effects on ferroelectric nano-thin films
    Pages 2966-2974
    L. Hong, A.K. Soh, Y.C. Song and L.C. Lim

    2.Dislocation structures and their relationship to strength in deformed nickel microcrystals
    Pages 2988-3001
    D.M. Norfleet, D.M. Dimiduk, S.J. Polasik, M.D. Uchic and M.J. Mills

    3.Atomistic simulations of the shear strength and sliding mechanisms of copper–niobium interfaces
    Pages 3109-3119
    J. Wang, R.G. Hoagland, J.P. Hirth and A. Misra

    Tag：Hoagland_RG Misra_A
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  • Appl. Phys. Lett. 92, 231901 (2008) - [Applied Physics Letters]

    2008-06-10

    Deformability of ultrahigh strength 5  nm Cu/Nb nanolayered composites

    N. A. Mara,1 D. Bhattacharyya,2 P. Dickerson,1 R. G. Hoagland,1 and A. Misra2

    1Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

    2Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

    In this work, micropillar compression testing has been used to obtain stress-strain curves for sputter-deposited Cu–Nb nanolaminate composites with nominal bilayer thickness of 10  nm. In addition to the extremely high flow strength of 2.4  GPa, the 5  nm Cu/5  nm Nb nanolaminate exhibits significant ductility, in excess of 25% true strain. ©2008 American Institute of Physics
    Tag：Hoagland_RG Misra_A
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  • JOM, Volume 60, Number 4 / 2008年4月, 1047-4838 - [JOM]

    2008-04-29

    The multiscale modeling of plastic deformation in metallic nanolayered composites

    A. Misra1, M. J. Demkowicz1, J. Wang1 and R. G. Hoagland1

    (1) 

    Los Alamos National Laboratory, Center for Integrated Nano Tech., Los Alamos, NM 87545, USA

    Abstract  Metallic nanolayered composites exhibit very high flow strength and stable plastic flow to large strains. The explanation of the unusual mechanical behavior of these materials in terms of the atomic structures of the interfaces and layer thickness ranging from nanometers to micrometers requires atomistic simulations, dislocation theory, and crystal plasticity modeling across length scales.

    Tag：Misra_A Hoagland_RG
    Steven 发表于23:30:42 | 阅读全文 | 评论 0 | 编辑 | 分享 0

  • Phys. Rev. Lett. 100, 136102 (2008) - [Physical Review Letters]

    2008-04-02

    Interface Structure and Radiation Damage Resistance in Cu-Nb Multilayer Nanocomposites

    M. J. Demkowicz, R. G. Hoagland, and J. P. Hirth

    Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA(Received 13 November 2007; published 1 April 2008)

    We use atomistic simulations to show that upon removal or insertion of atoms, misfit dislocations in Cu-Nb interfaces shift between two adjacent planes, forming pairs of extended jogs. Different jog combinations give rise to interface structures with unlike densities but nearly degenerate energies, making Cu-Nb interfaces virtually inexhaustible sinks for radiation-induced point defects and catalysts for efficient Frenkel pair recombination.

    Tag：Hirth_JP Hoagland_RG
    Steven 发表于21:18:25 | 阅读全文 | 评论 0 | 编辑 | 分享 0
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