Application of TDGL model to B2 type ordering with two step phase separation in Fe-Ni-Al alloys

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

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

Formation of domain structures in two-step phase separation in Fe-based Fe-Ni-Al alloys are investigated by applying a time-dependent Ginzburg-Landau (TDGL) model. The present authors recently developed a 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, multiple types of variants of the structures are represented by three order parameters which can be measured independently through crystal structure factors. Mean-field free energies are 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 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. 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 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.

本文言語英語
ホスト出版物のタイトルProceedings of the Multiscale Materials Modeling 2012 Conference
出版社Materials Research Society
ページ41-47
ページ数7
ISBN(印刷版)9781632661258
DOI
出版ステータス出版済み - 2013
イベント21st International Materials Research Congress, IMRC 2012 - Cancun, メキシコ
継続期間: 8 12 20128 17 2012

出版物シリーズ

名前Materials Research Society Symposium Proceedings
1535
ISSN(印刷版)0272-9172

その他

その他21st International Materials Research Congress, IMRC 2012
国/地域メキシコ
CityCancun
Period8/12/128/17/12

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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