| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
| Presentation Title |
Micropillar Compression Testing with In-situ Raman Spectroscopy to Study Plastic Deformation in Vitreous Silica |
| Author(s) |
Shefford P. Baker, Zachary W. Rouse, Praveena Manimunda, Nicole T. Wiles, S.A. Syed-Asif |
| On-Site Speaker (Planned) |
Shefford P. Baker |
| Abstract Scope |
While extensive plastic deformation is possible in silicate glasses at room temperature in indentation or scratch tests, very little is known about the atomic scale mechanisms that control plasticity. We have developed methods for manufacturing millions of high-quality micrometer-scale pillars in vitreous silica as well as specialized equipment for mechanical testing of those pillars in-situ in a Raman microscope. Raman spectra are seen to change significantly with load. A detailed analysis is used to propose a range of atomic mechanisms of both elastic and plastic deformation that is consistent with both the continuum scale mechanical behavior and the shifts in the Raman spectra with load. These results are compared with Raman spectra taken from residual indentations and from hydrostatically compressed glass in-situ. A taxonomy of plastic deformation mechanisms for silicate glasses is presented. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |