• Materials Science and Engineering: A - Volume 489, Issues 1-2, Pages 1-466 (20 August 2008) - [Materials Science and Engineer]

    2008-06-18

    1.Mechanical properties of sputtered silicon oxynitride films by nanoindentation
    Pages 294-301
    Yan Liu, I.-Kuan Lin and Xin Zhang

    2.Size effect on strength and strain hardening of small-scale [1 1 1] nickel compression pillars
    Pages 319-329
    C.P. Frick, B.G. Clark, S. Orso, A.S. Schneider and E. Arzt

    Tag：Zhang_X Arzt_E
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  • Philosophical Magazine - [Philosophical Magazine]

    2008-05-17

    Strain bursts in plastically deforming molybdenum micro- and nanopillars

    M. Zaiser a;  J. Schwerdtfeger a;  A. S. Schneider b;  C. P. Frick b;  B. G. Clark b;  P. A. Gruber bc; E. Arzt bd

     

    a The University of Edinburgh, Institute for Materials and Processes, Edinburgh EH9 3JL, UK

    b Max-Planck-Institut fuumlr Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany

    c Universitaumlt Karlsruhe, Institut fuumlr Zuverlaumlssigkeit von Bauteilen und Systemen, Kaiserstr. 12, 76131, Karlsruhe, Germany

    d Leibniz Institute for New Materials, Saarbruumlcken, Germany

    Abstract

    Plastic deformation of micron and sub-micron scale specimens is characterized by intermittent sequences of large strain bursts (dislocation avalanches) which are separated by regions of near-elastic loading. In the present investigation we perform a statistical characterization of strain bursts observed in stress-controlled compressive deformation of monocrystalline molybdenum micropillars. We characterize the bursts in terms of the associated elongation increments and peak deformation rates, and demonstrate that these quantities follow power-law distributions that do not depend on specimen orientation or stress rate. We also investigate the statistics of stress increments in between the bursts, which are found to be Weibull distributed and exhibit a characteristic size effect. We discuss our findings in view of observations of deformation bursts in other materials, such as face-centred cubic and hexagonal metals.

    Keywords: micropillars; molybdenum; dislocations; nanomechanics; plasticity of metals

     
    Tag：Arzt_E
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  • Acta Materialia - Volume 56, Issue 9, Pages 1909-2164 (May 2008) - [Acta Materialia]

    2008-05-03

    1.Formation of nonequilibrium phases and associated structural transitions in the Rh–Ta system induced by ion beam mixing
    Pages 3-6
    W.C. Wang, J.H. Li, Y. Dai and B.X. Liu

    2.Orientation-independent pseudoelasticity in small-scale NiTi compression pillars
    Pages 7-10
    Carl P. Frick, Blythe G. Clark, Steffen Orso, Petra Sonnweber-Ribic and Eduard Arzt

    3.Validating grain size analysis from X-ray line broadening: A virtual experiment
    Pages 15-18
    J. Markmann, V. Yamakov and J. Weissmüller

    Tag：Arzt_E
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  • Acta Materialia - Volume 56, Issue 8, Pages 1657-1908 (May 2008) - [Acta Materialia]

    2008-04-14

    1.Enhanced strain-rate sensitivity in fcc nanocrystals due to grain-boundary diffusion and sliding
    Acta Materialia, Volume 56, Issue 8, May 2008, Pages 1741-1752
    Yujie Wei, Allan F. Bower, Huajian Gao

    2.Strengthening gold thin films with zirconia nanoparticles for MEMS electrical contacts
    Acta Materialia, Volume 56, Issue 8, May 2008, Pages 1813-1819
    Jesse R. Williams, David R. Clarke

    3.Strong single-crystalline Au films tested by a new synchrotron technique
    Acta Materialia, Volume 56, Issue 8, May 2008, Pages 1876-1889
    Patric A. Gruber, Christian Solenthaler, Eduard Arzt, Ralph Spolenak

    Tag：Bower_AF Gao_HJ Clarke_DR Spolenak_R Arzt_E
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