Strain bursts in plastically deforming Molybdenum micro- and nanopillars

Details Strain bursts in plastically deforming Molybdenum micro- and nanopillars Strain bursts in plastically deforming Molybdenum micro- and nanopillars

2008-02-13

arxiv.org/abs/0802.1843v1

Physics

Condensed Matter

Materials Science

14 pages, 8 figures, submitted to Phil Mag

Scientific paper

10.1080/14786430802132522

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-centered cubic and hexagonal metals.

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