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

Date
2002-01-01
Authors
Gannepalli, Anil
Mallapragada, Surya
Mallapragada, Surya
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Journal Issue
Series
Department
Chemical and Biological Engineering
Abstract

Atomistic studies are carried out to investigate the formation and evolution of defects during nanoindentation of a gold crystal. The results in this theoretical study complement the experimental investigations [J. D. Kiely and J. E. Houston, Phys. Rev. B 57, 12 588 (1998)] extremely well. The defects are produced by a three step mechanism involving nucleation, glide, and reaction of Shockley partials on the {111} slip planes non-coplanar with the indented surface. We have observed that slip is in the directions along which the resolved shear stress has reached the critical value of approximately 2 GPa. The first yield occurs when the shear stresses reach this critical value on all the {111} planes involved in the formation of the defect. The phenomenon of strain hardening is observed due to the sessile stair-rods produced by the zipping of the partials. The dislocation locks produced during the second yield give rise to permanent deformation after retraction.

Comments

This article is from Physical Review B - Condensed Matter and Materials Physics 66 (2002): 104103, doi: 10.1103/PhysRevB.66.104103. Posted with permission.

Description
Keywords
Citation
DOI
Collections