Abstract
The present authors recently developed a time-dependent Ginzburg-Landau (TDGL) formulation for ordering processes of B2 and D03 in binary alloys, taking into account the symmetrical relationships between these ordered phases. In this formulation, mean-field free energies are defined in a form of Landau type expansion with order parameters and a composition parameter. Interfacial energies due to local variations of degrees of order and composition are given in a gradient square approximation. Kinetic equations for time-evolution of the order parameters and the composition one are derived from the Ginzburg-Landau type potential consisting of the mean-field free energies and the interfacial energy terms. On the other hand, coauthors have investigated domain structures in two-step phase separation of Fe-based Fe-Ni-Al alloys. Micro-structures in the super alloys consist of B2 ordered domains and A2 disordered matrices in the first stage of phase separation. The second stage during a subsequent aging leads to formation of B2 domains and A2 phase regions in the former A2 matrices and B2 domains, respectively. The evolution of three-dimensional domain structures and composition profiles has been analyzed by electron tomography imaging and energy-dispersive X-ray spectroscopy. In this work the authors have applied the TDGL formulation to this alloy system, and performed three-dimensional numerical simulations assuming the thermal processing. The results of the simulations well reproduced the characteristics of the micro-structures obtained from the observations.
| Original language | English |
|---|---|
| Title of host publication | 4th International Symposium on Slow Dynamics in Complex Systems |
| Subtitle of host publication | Keep Going Tohoku |
| Pages | 703-709 |
| Number of pages | 7 |
| DOIs | |
| Publication status | Published - Mar 12 2013 |
| Event | 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku - Sendai, Japan Duration: Dec 2 2012 → Dec 7 2012 |
Publication series
| Name | AIP Conference Proceedings |
|---|---|
| Volume | 1518 |
| ISSN (Print) | 0094-243X |
| ISSN (Electronic) | 1551-7616 |
Other
| Other | 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku |
|---|---|
| Country | Japan |
| City | Sendai |
| Period | 12/2/12 → 12/7/12 |
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All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics
- Ecology
- Plant Science
- Physics and Astronomy(all)
- Nature and Landscape Conservation
Cite this
Simulations of structure formation in B2 type ordering with two step phase separation in Fe-Ni-Al alloys. / Oguma, Ryuichiro; Matsumura, Syo; Doi, Minoru; Hata, Satoshi; Ogata, Keisuke.
4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku. 2013. p. 703-709 (AIP Conference Proceedings; Vol. 1518).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Simulations of structure formation in B2 type ordering with two step phase separation in Fe-Ni-Al alloys
AU - Oguma, Ryuichiro
AU - Matsumura, Syo
AU - Doi, Minoru
AU - Hata, Satoshi
AU - Ogata, Keisuke
PY - 2013/3/12
Y1 - 2013/3/12
N2 - The present authors recently developed a time-dependent Ginzburg-Landau (TDGL) formulation for ordering processes of B2 and D03 in binary alloys, taking into account the symmetrical relationships between these ordered phases. In this formulation, mean-field free energies are defined in a form of Landau type expansion with order parameters and a composition parameter. Interfacial energies due to local variations of degrees of order and composition are given in a gradient square approximation. Kinetic equations for time-evolution of the order parameters and the composition one are derived from the Ginzburg-Landau type potential consisting of the mean-field free energies and the interfacial energy terms. On the other hand, coauthors have investigated domain structures in two-step phase separation of Fe-based Fe-Ni-Al alloys. Micro-structures in the super alloys consist of B2 ordered domains and A2 disordered matrices in the first stage of phase separation. The second stage during a subsequent aging leads to formation of B2 domains and A2 phase regions in the former A2 matrices and B2 domains, respectively. The evolution of three-dimensional domain structures and composition profiles has been analyzed by electron tomography imaging and energy-dispersive X-ray spectroscopy. In this work the authors have applied the TDGL formulation to this alloy system, and performed three-dimensional numerical simulations assuming the thermal processing. The results of the simulations well reproduced the characteristics of the micro-structures obtained from the observations.
AB - The present authors recently developed a time-dependent Ginzburg-Landau (TDGL) formulation for ordering processes of B2 and D03 in binary alloys, taking into account the symmetrical relationships between these ordered phases. In this formulation, mean-field free energies are defined in a form of Landau type expansion with order parameters and a composition parameter. Interfacial energies due to local variations of degrees of order and composition are given in a gradient square approximation. Kinetic equations for time-evolution of the order parameters and the composition one are derived from the Ginzburg-Landau type potential consisting of the mean-field free energies and the interfacial energy terms. On the other hand, coauthors have investigated domain structures in two-step phase separation of Fe-based Fe-Ni-Al alloys. Micro-structures in the super alloys consist of B2 ordered domains and A2 disordered matrices in the first stage of phase separation. The second stage during a subsequent aging leads to formation of B2 domains and A2 phase regions in the former A2 matrices and B2 domains, respectively. The evolution of three-dimensional domain structures and composition profiles has been analyzed by electron tomography imaging and energy-dispersive X-ray spectroscopy. In this work the authors have applied the TDGL formulation to this alloy system, and performed three-dimensional numerical simulations assuming the thermal processing. The results of the simulations well reproduced the characteristics of the micro-structures obtained from the observations.
UR - http://www.scopus.com/inward/record.url?scp=84874712997&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84874712997&partnerID=8YFLogxK
U2 - 10.1063/1.4794662
DO - 10.1063/1.4794662
M3 - Conference contribution
AN - SCOPUS:84874712997
SN - 9780735411418
T3 - AIP Conference Proceedings
SP - 703
EP - 709
BT - 4th International Symposium on Slow Dynamics in Complex Systems
ER -