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Showing 1–5 of 5 results
Advanced filters: Author: Frederic Sansoz Clear advanced filters

  • Crystal defects critically influence surface chemical reactions in nanomaterials, yet the basic mechanisms at play are still elusive. Here, the authors show the atomic-scale dynamics of surface oxidation at coherent planar defects in Ag and Pd, revealing how twins and stacking-faults selectively oxidize metallic nanocrystals.

    • Qi Zhu
    • Zhiliang Pan
    • Jiangwei Wang
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-8

  • Low-dimensional materials containing defects such as twin boundaries are known to fail well below their theoretical strength due to surface imperfections. Here, Wang et al. observe strengths close to the ideal limit in gold nanowires with angstrom scale twins, where homogeneous dislocation nucleation controls deformation.

    • Jiangwei Wang
    • Frederic Sansoz
    • Scott X. Mao
    ResearchOpen Access
    Nature Communications
    Volume: 4, P: 1-8

  • It is believed that the strengthening of metals by formation of nanoscale grains or coherent twin boundaries is limited to a maximum strength. Here, using experiment and theory, it is shown that the fabrication of nanocrystalline-nanotwinned Ag with trace Cu results in a hardness beyond this limit.

    • Xing Ke
    • Jianchao Ye
    • Frederic Sansoz
    Research
    Nature Materials
    Volume: 18, P: 1207-1214

  • Coherent twin boundaries, which usually form during the growth, deformation or annealing of crystalline solids, are widely described as perfect interfaces. Experiments and simulations now show that as-grown coherent twin boundaries in nanotwinned copper consist of incoherent segments and partial dislocations, and significantly affect the material’s mechanical behaviour and deformation mechanisms.

    • Y. Morris Wang
    • Frederic Sansoz
    • Alex V. Hamza
    Research
    Nature Materials
    Volume: 12, P: 697-702