| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
Studying the Anisotropic Deformation of Sapphire in Different Crystallographic Orientations using Nanoindentation and Micropillar Compression |
| Author(s) |
Anugraha Thyagatur Kidigannappa, Alex Montagne, Xavier Maeder , Johann Michler , Veronica Trabadelo , Fatemeh Saeidi , M. Parlinska-Wojtan, Kilian Wasmer, Siddhartha Pathak |
| On-Site Speaker (Planned) |
Anugraha Thyagatur Kidigannappa |
| Abstract Scope |
Single crystal sapphire has hexagonal close-packed crystal structure hence exhibits mechanical anisotropy in different orientations. In this work deformation behavior and crack propagation of single crystal sapphire in four crystallographic orientations: <10 –10>, <1 – 210>, <0001> and <-1012>, corresponding to M, A, C and R planes respectively, were systematically studied using nanoindentation with spherical indenters of 1 μm and 10 μm radius, and micropillar compression. Indentation and micropillar compression data reveal that the R plane was more prone to deform plastically as compared to other planes. The residual deformations of the four planes were analyzed using Schmid law and geometric observations. Indentation stress-strain curves were also utilized to understand the origin and anisotropic behavior of pop-ins in the various crystallographic planes using cumulative statistics. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |