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Influence of Crystalline Nanoprecipitates on Shear Band Propagation in Cu-Zr Based Metallic Glasses

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      Abstract

      The interaction of shear bands with crystalline nanoprecipitates in Cu-Zr-based metallic glasses is investigated by a combination of high-resolution TEM imaging and molecular dynamics computer simulations. Our results reveal different interaction mechanisms: Shear bands can dissolve precipitates, can wrap around crystalline obstacles, or can be blocked depending on size and density of the precipitates. If the crystalline phase has a low yield strength, we also observe slip transfer through the precipitate. Based on the computational results and experimental findings a qualitative mechanism map is proposed that categorizes the various processes as a function of the critical stress for dislocation nucleation, precipitate size and distance.

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      Journal
      2015-05-04
      2015-12-16
      1505.00723

      http://arxiv.org/licenses/nonexclusive-distrib/1.0/

      Custom metadata
      15 pages, 15 figures. Submitted to Physical Review Applied
      cond-mat.mtrl-sci

      Condensed matter

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