Abstract
The true fracture strain is estimated based on the idea that the grain boundary (GB) fracture in an Al-6.0%Zn-2.6%Mg alloy is the ductile fracture within the precipitate free zone (PFZ) and the experimental equation according to Edelson et al. could be applied to the fracture within the PFZ. Thus, the fracture strain is expressed approximately as ϵ f∼- q k k′ w D 3N′ where q is a factor in relation to the strain ratio of the interior of PFZ's to that of grains, k a constant estimated from the Edelson's experiment, and k′ the factor connected with the ratio of the interfacial energy between the GB precipitate and matrix, to the GB energy. And w is the width of the PFZ, D the GB precipitate size, N the number of GB precipitates per unit area. The calculated fracture strain agreed with the observed one within the experimental error.
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