Influence of Crystalline Nanoprecipitates on Shear-Band Propagation in Cu-Zr-Based Metallic Glasses
T Brink and M Peterlechner and H Rosner and K Albe and G Wilde, PHYSICAL REVIEW APPLIED, 5, 054005 (2016).
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 the 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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