Formation of a dislocation dipole in the consecutive interfaces of two nanowires

• Published in: Mechanics of materials Vol. 198; p. 105111
• Main Author: Colin, Jérôme
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2024; Elsevier
• Subjects: Condensed Matter; Dislocations; Materials Science; Modeling; Nanowires; Physics; Plasticity; Nanowires; Modeling; Plasticity; Dislocations
• ISSN: 0167-6636; 1872-7743
• DOI: 10.1016/j.mechmat.2024.105111

The formation of a dipole of edge dislocations in the consecutive interfaces of two neighboring square-shaped nanowires has been investigated from an energy-based calculation. Assuming the dipole is nucleated in the center of the matrix row between the two nanowires, the energy variation induced by the climbing of the dislocations in the interfaces (one by interface) has been first determined. The energy barrier and unstable equilibrium positions of the dipole have been thus characterized. Considering then the dislocations can also glide into the interfaces, the resulting supplementary gliding energy variation has been considered and the dislocation stable equilibrium positions in the interfaces have been determined, assuming they are distributed symmetrically with respect to the central point of the structure. The effect of the width of the matrix row between the two nanowires on the critical misfit strain required for the introduction of the dislocations in the nanowire interfaces has been finally analyzed. •The misfit strain of two square-shaped nanowires in an infinite-size matrix is calculated.•The formation of a dislocation dipole from the matrix row to the nanowire interfaces is studied.•The climbing and gliding energies of the dislocations are calculated analytically.•The energy barrier, stable and unstable equilibrium positions of the dislocations are determined.