| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
|
| Presentation Title |
Investigating Bulk Mechanical Properties on a Micro-scale: Micro-tensile Testing of Ultrafine Grained Ni-SiC Composite to Determine its Fracture Mechanism and Strain Rate Sensitivity |
| Author(s) |
Dhriti Bhattacharyya, Alan Xu, Chao Yang, Gordon Thorogood, Michael Saleh |
| On-Site Speaker (Planned) |
Michael Saleh |
| Abstract Scope |
In-situ micro-tensile tests were performed to investigate the mechanical properties of ultrafine grained Ni-3wt% SiC composite. The objective was to understand the sample size effect on the mechanical properties of the composite and the reasons for the low ductility of the bulk composite. Dog-bone micro-tensile samples were manufactured using a Focused Ion Beam instrument to dimensions of 15 µm length by 5 µm (w) by 5 µm (h). The samples were tested in tension at a low strain rate (LSR) of 0.000087/s and a relatively higher strain rate (HSR) of 0.011/s. The LSR tests produced yield stress, ultimate tensile stress and modulus values that approach those previously reported for bulk/macro-level tensile tests. However, the elongation and fracture energy at the micro-level was approximately half that at the bulk scale. This discrepancy is attributed to unwanted carbon and silicon oxide impurities ~1.5 µm in diameter which act as stress concentrators. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |