Journal article
Spherical nanoindentation and deformation mechanisms in freestanding GaN films
Drexel University. College of Engineering. Department of Materials Science and Engineering. Faculty Research and Publications.
09 Jul 2007
Abstract
In this work, spherical nanoindentation—with nanoindenter radius of 1 or 13.5 m—was used to explore the deformation behavior of GaN freestanding films with two orientations, C basal and A prismatic , grown by hydride vapor phase epitaxy. For the C plane, all the results shown herein and most of those in the literature can be explained by invoking the activation of basal slip alone. The wide distribution of pop-in stresses in the C plane is believed to depend on initial surface and/or near surface defect concentrations. By converting the nanoindentation load-displacement data to indentation stress-strain curves and comparing those for the A and C planes after the pop-ins, we conclude that basal slip is also implicated in the deformation of the A plane. The elastic moduli, determined from spherical nanoindentation, depend on the indenter size. In the C plane repeated spherical nanoindentations, to the same stress, result in reversible, hysteretic loops that are attributed to the formation of incipient kink bands and/or the to-and-fro motion of mobile dislocation walls.
Metrics
Details
- Title
- Spherical nanoindentation and deformation mechanisms in freestanding GaN films
- Creators
- Sandip Basu (Author) - Drexel University (1970-)M. W. Barsoum (Author) - Drexel University (1970-)Adrian D. Williams (Author) - Drexel University (1970-)T. D. Moustakas (Author) - Drexel University (1970-)
- Publication Details
- Drexel University. College of Engineering. Department of Materials Science and Engineering. Faculty Research and Publications.
- Publisher
- American Institute of Physics (AIP)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; College of Engineering; Drexel University (1970-)
- Web of Science ID
- WOS:000246072200076
- Scopus ID
- 2-s2.0-34247613018
- Other Identifier
- 991014632085004721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Physics, Applied