| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Contributions to the Understanding of Hydrogen Embrittlement by a Thermodynamic Approach |
| Author(s) |
Reiner Kirchheim |
| On-Site Speaker (Planned) |
Reiner Kirchheim |
| Abstract Scope |
Fracture and deformation occurs by the formation, annihilation and motion of lattice discontinuities. Thus vacancies and dislocations cause plastic flow or new surfaces are formed during fracture. The energy of generating these discontinuities is decreased with increasing chemical potential of hydrogen as described the defactant concept [1]. Thus concentration of vacancies or density of dislocations is increased during plastic deformation in the presence of hydrogen. The same applies [2] to generating new surfaces (Hirth-Rice model). The motion of discontinuities may be increased despite solute drag, if discontinuities move by the formation of secondary discontinuities like kink pairs at dislocations. The thermodynamic concept is valid for all solutes; hydrogen is just a unique example of seeing and understanding the diversity of many chemomechanical effects including hydrogen embrittlement.
[1] R. Kirchheim, Int. J. of Materials Research 100 (2009) 483-487
[2] Kirchheim et al., Acta Materialia 99 (2015) 87–98 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Mechanical Properties, Modeling and Simulation |