Positron annihilation spectroscopy on nanocrystalline shows the segregation of Zr at the interfaces and a decrease of the fraction of nanovoids the size of 10 to 15 missing atoms upon isochronal annealing up to K by which the grain size increases up to nm. In this state, the positron trapping at interfacial free volumes reversibly changes contingent upon the temperature whereas the interfacial composition is unchanged when the measuring temperature varies.
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