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Atomistic studies are carried out to investigate the formation and evolutionof defects during nanoindentation of a gold crystal. The results in thistheoretical study complement the experimental investigations [J. D. Kiely andJ. E. Houston, Phys. Rev. B, v57, 12588 (1998)] extremely well. The defects areproduced by a three step mechanism involving nucleation, glide and reaction ofShockley partials on the {111} slip planes noncoplanar with the indentedsurface. We have observed that slip is in the directions along which theresolved shear stress has reached the critical value of approximately 2 GPa.The first yield occurs when the shear stresses reach this critical value on allthe {111} planes involved in the formation of the defect. The phenomenon ofstrain hardening is observed due to the sessile stair-rods produced by thezipping of the partials. The dislocation locks produced during the second yieldgive rise to permanent deformation after retraction.Comment: 11 pages, 13 figures, submitted to Physical Review

Atomistic studies of defect nucleation during nanoindentation of Au(001)