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[资源] Revealing the Maximum Strength in Nanotwinned Copper 卢柯2009 Science

Revealing the Maximum Strength
in Nanotwinned Copper
L. Lu,1* X. Chen,1 X. Huang,2 K. Lu1
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–related
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.

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