About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Effect of Stress Induced Nanohydride Formation on the Plasticity of Fe Alloys |
| Author(s) |
Tilmann Hickel, Ali Tehranchi, Joerg Neugebauer |
| On-Site Speaker (Planned) |
Joerg Neugebauer |
| Abstract Scope |
The formation of nanohydrides under loading has significant implications for hydrogen embrittlement and storage. In this work, ab initio calculations and stress dependent phase diagrams in chemical potential space are used to clarify the effect of nanohydrides on the mechanical properties of steels. The presentation will be focussed on the pop-in load of in situ nanoindentation of FeCr alloys. It is shown that the anisotropic stress field of the indenter with a radius of 170 nm facilitates the formation of nanohydrides with significantly lower elastic constants and containing high eigen shear strain. The shear stress associated with these inhomogeneous inclusions is responsible for the experimentally observed reduction in critical shear for dislocation nucleation and the pop-in loads in these indentation experiments. Based on these insights, the interplay of nanohydrides with defects and its impact on plasticity will further be discussed for other Fe-based alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Mechanical Properties, Iron and Steel |