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Dr. K. Lu Group >> Research Highlight
Revealing the Maximum Strength in Nanotwinned Copper
  • Abstract
      The strength of polycrystalline materials increases with decreasing grain size. Below a critical size, smaller grains might lead to softening, as suggested by atomistic simulations. The strongest size should arise at a transition in deformation mechanism from lattice dislocation activities to grain boundary¨Crelated processes. We investigated the maximum strength of nanotwinned copper samples with different twin thicknesses. We found that the strength increases with decreasing twin thickness, reaching a maximum at 15 nanometers, followed by a softening at smaller values that is accompanied by enhanced strain hardening and tensile ductility. The strongest twin thickness originates from a transition in the yielding mechanism from the slip transfer across twin boundaries to the activity of preexisting easy dislocation sources.
  • Paper Published
      Revealing the Maximum Strength in Nanotwinned Copper. [ Full Text ]
    Last modified: 2009/3/5
    Revealing the Maximum Strength in Nanotwinned Copper
    Ultrahigh Strength and High Electrical Conductivity in Copper
    Melting mechanisms at the limit of superheating
    Nitriding Iron at Lower Temperatures
    Superplastic extensibility of nanostructured Cu at room temperature
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    Dr. K. Lu Group, Institute of Metal Research, Chinese Academy of Sciences.
    Address: 72 Wenhua Road, Shenyang, 110016, China