Based on the principal of virtual work, we derive an equation that describes the balance between volume and interface stresses in a particulate two-phase nanocomposite, belonging to the class of random heterogeneous materials. Extracting absolute values of interface stress requires precise measurement of residual-strain-free lattice parameters and determination of interface area as well as volume fractions of phases. We find a value of 3.5 Â± 0.2Nmâˆ’1 for the isotropic phase boundary stress of the Ag/Ni interface and a value of 0.67 Â± 0.1Nmâˆ’1 for the grain-boundary stress of Ag. If we compare this value with literature values for Gd, Pd and Fe, it appears that grain boundary stress linearly correlates with the melting temperature of those elements.
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