Abstract
Metallographic and fractographic tests of liquid metal embrittlement (LME) are performed for nanocrystall ine (NC) Ni-Hg systems. It is shown that the behavior of NC Ni at these conditions is close to that of ordinary polycrystalline materials. The presence of the stage of subcritical crack growth seems to be the most important result of the studied system. Since NC grains have none of their own intrinsic dislocations, it is assumed that subcritical crack growth in liquid metal environment can be realized through the mechanism of dissolution of atoms from the crack tip. This dissolution-condensation model of LME developed for polycrystals can also be applied to nanocrystals.
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