| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
100 Years and Still Cracking: A Griffith Fracture Symposium
|
| Presentation Title |
Imaging the Chemo-mechanical Coupled Fracture in Metal Passivation Layer by In-situ TEM |
| Author(s) |
Yang Yang, Akihiro Kushima, Huolin Xin, Peter Hosemann, Ju Li |
| On-Site Speaker (Planned) |
Yang Yang |
| Abstract Scope |
The mechanical performance of oxide scales is crucial for the stress corrosion resistance of metals. If cracks in oxide are generated during deformation or oxidation, embittering elements can diffuse into metal more easily, leading to greatly enhanced internal corrosion and materials degradation. Despite of the importance of oxide layers, the difficulty of imaging the environmental deformation of surface oxides at nanoscale has limited the understanding of their properties. Using an environmental TEM, here we report on in-situ experiments to overcome this challenge. We discovered that native alumina is liquid-like during deformation at room temperature, and it can remain its integrity without any cracks or spallation at moderate strain rate. On the contrary, zirconium quickly develops internal cracks during oxidation at 550 Celsius even without external forces. In this talk, we will discuss the chemo-mechanical coupled fracture in metal passivation layer and its impact on the stress-corrosion-cracking resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Aluminum, Mechanical Properties |