Simulations of structure formation in B2 type ordering with two step phase separation in Fe-Ni-Al alloys

Ryuichiro Oguma, Syo Matsumura, Minoru Doi, Satoshi Hata, Keisuke Ogata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 languageEnglish
Title of host publication4th International Symposium on Slow Dynamics in Complex Systems
Subtitle of host publicationKeep Going Tohoku
Pages703-709
Number of pages7
DOIs
Publication statusPublished - Mar 12 2013
Event4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku - Sendai, Japan
Duration: Dec 2 2012Dec 7 2012

Publication series

NameAIP Conference Proceedings
Volume1518
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku
CountryJapan
CitySendai
Period12/2/1212/7/12

Fingerprint

interfacial energy
formulations
simulation
free energy
microstructure
binary alloys
matrices
kinetic equations
tomography
gradients
expansion
profiles
approximation
spectroscopy
electrons
x rays
energy

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

Cite this

Oguma, R., Matsumura, S., Doi, M., Hata, S., & Ogata, K. (2013). Simulations of structure formation in B2 type ordering with two step phase separation in Fe-Ni-Al alloys. In 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku (pp. 703-709). (AIP Conference Proceedings; Vol. 1518). https://doi.org/10.1063/1.4794662

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 proceedingConference contribution

Oguma, R, Matsumura, S, Doi, M, Hata, S & Ogata, K 2013, Simulations of structure formation in B2 type ordering with two step phase separation in Fe-Ni-Al alloys. in 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku. AIP Conference Proceedings, vol. 1518, pp. 703-709, 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku, Sendai, Japan, 12/2/12. https://doi.org/10.1063/1.4794662
Oguma R, Matsumura S, Doi M, Hata S, Ogata K. Simulations of structure formation in B2 type ordering with two step phase separation in Fe-Ni-Al alloys. In 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku. 2013. p. 703-709. (AIP Conference Proceedings). https://doi.org/10.1063/1.4794662
Oguma, Ryuichiro ; Matsumura, Syo ; Doi, Minoru ; Hata, Satoshi ; Ogata, Keisuke. / Simulations of structure formation in B2 type ordering with two step phase separation in Fe-Ni-Al alloys. 4th International Symposium on Slow Dynamics in Complex Systems: Keep Going Tohoku. 2013. pp. 703-709 (AIP Conference Proceedings).
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