Formation of domain structures in ordering processes of B2 and D0 3 types

Ryuichiro Oguma, Syo Matsumura, Tetsuo Eguchi

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

Abstract

Time-dependent Ginzburg-Landau (TDGL) formulation has been developed for ordering processes of B2 and D03 types in binary alloy systems. In the formulation three order parameters are defined to describe the state of order. Equivalent variants of B2 and D03 structures are distinguished with the order parameters. The mean-field free energy is defined in a form of Landau type expansion with the order parameters and a composition parameter. Interfacial energies due to local variations of degrees of order and concentration are given with gradient square approximation. Kinetic equations are derived from the Ginzburg-Landau type potential to describe time-evolutions of the order parameters and the concentration. Two-dimensional numerical simulations were performed on the basis of the derived kinetic equations. The results reproduce well the formation of B2 and D03 ordered domains in the processes in an Fe3Al alloy.

Original languageEnglish
Title of host publicationThermodynamics and Kinetics of Phase Transformations in Inorganic Materials
Pages79-84
Number of pages6
Publication statusPublished - Dec 1 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 27 2006Dec 1 2006

Publication series

NameMaterials Research Society Symposium Proceedings
Volume979
ISSN (Print)0272-9172

Other

Other2006 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/27/0612/1/06

Fingerprint

Kinetics
Binary alloys
Interfacial energy
Free energy
kinetic equations
Computer simulation
formulations
Chemical analysis
interfacial energy
binary alloys
free energy
gradients
expansion
approximation
simulation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Oguma, R., Matsumura, S., & Eguchi, T. (2006). Formation of domain structures in ordering processes of B2 and D0 3 types. In Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials (pp. 79-84). (Materials Research Society Symposium Proceedings; Vol. 979).

Formation of domain structures in ordering processes of B2 and D0 3 types. / Oguma, Ryuichiro; Matsumura, Syo; Eguchi, Tetsuo.

Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials. 2006. p. 79-84 (Materials Research Society Symposium Proceedings; Vol. 979).

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

Oguma, R, Matsumura, S & Eguchi, T 2006, Formation of domain structures in ordering processes of B2 and D0 3 types. in Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials. Materials Research Society Symposium Proceedings, vol. 979, pp. 79-84, 2006 MRS Fall Meeting, Boston, MA, United States, 11/27/06.
Oguma R, Matsumura S, Eguchi T. Formation of domain structures in ordering processes of B2 and D0 3 types. In Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials. 2006. p. 79-84. (Materials Research Society Symposium Proceedings).
Oguma, Ryuichiro ; Matsumura, Syo ; Eguchi, Tetsuo. / Formation of domain structures in ordering processes of B2 and D0 3 types. Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials. 2006. pp. 79-84 (Materials Research Society Symposium Proceedings).
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