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Showing 1–6 of 6 results
Advanced filters: Author: Daniel Şopu Clear advanced filters

  • A universal design strategy for nanograined metals aimed at utilizing oxygen nanoclustering to achieve the highly desired combination of high strength and large deformability that evades inverse Hall-Petch softening.

    • Xiaolong Yu
    • Xilei Bian
    • Gang Wang
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-12

  • The mechanisms of shear band initiation and propagation in amorphous metallic alloys is an open question of materials science. Here, the authors measure local strains around propagating shear bands and propose a model describing the plasticity of metallic glasses at different length scales.

    • Oleksandr Glushko
    • Reinhard Pippan
    • Jürgen Eckert
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-11

  • Understanding of the atomic-scale mechanisms of rejuvenation of bulk metallic glass still remains unclear. Here, using configurational entropy derived from X-ray experiments, authors show a clear picture of the relaxation process during annealing of a metallic glass.

    • Florian Spieckermann
    • Daniel Şopu
    • Jürgen Eckert
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-9

  • In this work, by involving high-energy scanning X-ray diffraction strain mapping, we identify and distinguish between structural and elastic heterogeneity in the extremely rejuvenated metallic glasses under triaxial compression. Microindentation hardness hints at an unsymmetrical hardening/softening picture and further reveals the complementary effects of stress and structure modulation. Our results suggest that simultaneous stress and structural modulation can be used to enhance rejuvenation beyond the limits known to date, and may therefore aid in the design of MGs with enhanced ductility and strain-hardening capability.

    • Daniel Şopu
    • Florian Spieckermann
    • Jürgen Eckert
    ResearchOpen Access
    NPG Asia Materials
    Volume: 15, P: 1-9

  • Understanding the correlation between atomic-scale structural/elastic fluctuations and local plastic rearrangements (shear transformation zone (STZ)) is essential to the widespread use of metallic glasses (MGs). We report a strategy to control the local stress state and enhance the shear stability of MGs. The enhanced degree of structural/elastic heterogeneities relates to the increased nonaffine thermal strain of the short- and medium-range order. We demonstrate that variations in the stress field around STZ affect their dynamics and percolation process, the progressive formation of shear bands, and, consequently, the macroscopic deformability of MGs. This work paves a new way for designing ductile MGs.

    • Xilei Bian
    • Daniel Şopu
    • Jürgen Eckert
    ResearchOpen Access
    NPG Asia Materials
    Volume: 12, P: 1-10