| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics and Kinetics of Alloys II
|
| Presentation Title |
Effect of Gibbs Free Energies of Terminal Alloys on the Diffusion Paths and Diffusion Depths in Couples Assembled with γ-Phase Fe-Ni-Cu Alloys at 1000 ⁰C |
| Author(s) |
Susanta Kumar Nayak, Biswarupa Samantaray, Kaustubh N Kulkarni |
| On-Site Speaker (Planned) |
Susanta Kumar Nayak |
| Abstract Scope |
A novel concept for diffusion couples based on iso-Gibbs free energy of mixing (iso-∆GM) is proposed, in which the two terminal alloys of the couple have the same Gibbs free energy of mixing. A few iso-∆GM couples were assembled with FCC Fe-Ni-Cu alloys at 1000 °C. To enable the selection of the terminal alloys for iso-∆GM couples, iso-∆GM lines were constructed from the data on the thermodynamic activities of the constituent elements in FCC Fe-Ni-Cu alloys at 1000 °C. A strategy is also proposed and utilized to construct a near iso-Gibbs free energy (iso-G^{soln}) couple. All but one iso-∆GM couples and also, the iso-G^{soln} couple were characterized by almost linear diffusion paths. All the iso-∆GM couples presented very low diffusion depths characterized in terms of effective penetration depth (\bar{x}), with the iso-G^{soln} couple exhibiting the lowest values of \bar{x}. Interdiffusion, tracer and intrinsic diffusion coefficients also determined at intersecting composition. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |