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• W2027114564 startingPage "5495" @default.
• W2027114564 abstract "The atomic structure in the core of two Schockley partial dislocations in copper, resulting from the dissociation of a perfect easy-glide dislocation, and its influence on the fault ribbon, have been investigated for the first time as a function of temperature using molecular dynamics. We employed a resonant model pseudopotential adapted to copper. Our results show that at increasing temperature, the core of the partial dislocations becomes increasingly extended and invades entirely the fault ribbon, but the separation distance between the partial dislocation pairs is not altered. It follows that the structure of the fault ribbon differs significantly from that of an infinitely extended stacking fault and for this reason experimental determinations of the stacking-fault energy, based on the measure of the separation distance between partial dislocation pairs, should be considered with caution. We found that the temperature dependence of the fault ribbon energy in our model is mainly due to the elastic-modulus variation. Moreover, at high temperatures vibrational amplitudes of atoms are much larger in the core of the partial dislocations than in the bulk of the perfect crystal and the local atomic structure becomes highly disordered. Although disordered, the core structure remains solidlike up to the melting point ${mathit{T}}_{mathit{m}}$. Above ${mathit{T}}_{mathit{m}}$ the liquid nucleates always in the core region, thus qualitatively indicating that the nucleation barrier therein is lower than in the bulk." @default.
• W2027114564 created "2016-06-24" @default.
• W2027114564 creator A5027399793 @default.
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• W2027114564 date "1990-09-15" @default.
• W2027114564 modified "2023-10-16" @default.
• W2027114564 title "Core structure of a dissociated easy-glide dislocation in copper investigated by molecular dynamics" @default.
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• W2027114564 doi "https://doi.org/10.1103/physrevb.42.5495" @default.
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