Logo image
Back
Microscale deformation of (001) and (100) rutile single crystals under spherical nanoindentation
Journal article   Peer reviewed

Microscale deformation of (001) and (100) rutile single crystals under spherical nanoindentation

Sandip Basu, Omar A. Elshrief, Robert Coward, Babak Anasori and Michel W. Barsoum
Journal of materials research, v 27(1)
01 Jan 2012
DOI: https://doi.org/10.1557/jmr.2011.337

Abstract

Materials Science Materials Science, Multidisciplinary Science & Technology Technology
Herein rutile (TiO2) single-crystal surfaces, with (001) and (100) orientations, were indented with hemispherical indenters with radii of 13.5, 5, and 1.4 mu m. By converting the load-displacement data to nanoindentation (NI) stress-strain curves, together with microscopic post-indentation observations, we conclude that in the (001) orientation, plastic deformation occurs by the activation of all four {101}<10<(1)over bar>> slip systems. In the (100) orientation, only two of the four {101}<10<(1)over bar> > slip systems, along with {100}<0<(1)over bar>0> slip, are activated. Because the four {101}<10<(1)over bar>> slip systems in the (001) orientation intersect, the surface is harder and exhibits higher hardening rates after the nucleation of dislocations. The latter are manifested by pop-ins, some of which are large. The pop-in stresses are adequately described by Weibull statistics and were significantly higher for the (001) orientation. The elastic moduli, determined from spherical NI stiffness versus contact radii plots, were 349 +/- 5 and 229 +/- 4 GPa for (001) and (100) orientations, respectively. Fully spontaneous reversible, stress-strain hysteretic curves-only manifest in the (100) orientation-are attributed to the to-and-fro motion of dislocations comprising incipient kink bands in the {100}<0<(1)over bar>0> slip system.

Metrics

11 Record Views
12 citations in Web of Science
12 citations in Scopus

Details

InCites Highlights

Data related to this publication, from InCites Benchmarking & Analytics tool:

Collaboration types
Domestic collaboration
Web of Science research areas
Materials Science, Multidisciplinary
Logo image