- Address
- 305-0047 1-2-1 Sengen Tsukuba Ibaraki JAPAN [Access]
Research
- Keywords
計算機シミュレーション、フェーズフィールド法、ミクロ組織
PublicationsNIMS affiliated publications since 2004.
Research papers
- K. Niitsu, F. Ichihara, S. Miyoshi, M. Ode, K. Mitsuishi, T. Masuda, K. Takada. Structural analysis of the LiCoO2 cathodes/garnet-type Li6.5La3Zr1.5Ta0.5O12 solid electrolyte interface. Solid State Ionics. 421 (2025) 116804 10.1016/j.ssi.2025.116804 Open Access
- Takumi Morino, Machiko Ode, Shoichi Hirosawa. An explicit integration approach for predicting the microstructures of multicomponent alloys. Nature Communications. 16 [1] (2025) 6504 10.1038/s41467-025-61246-7 Open Access
- Marino Tanaka, Mayu Muramatsu, Machiko Ode, Taichi Abe. Thermodynamic reassessment of the Fe–Pt system. Calphad. 90 (2025) 102868 10.1016/j.calphad.2025.102868
Proceedings
- MURAKAMI, Hideyuki, ISHIDA, Akira, TAKAMORI, Susumu, ODE, Machiko, 江阪 久雄. Application of Pt-based paste coatings for surface modification of cast Ni-based superalloys. International Symposium on High temperature Oxidation and Corrosion 2022 Abstracts. 1 (2022) 271-272
- M. Ode, N. Sasajima, Y. Yamada, P. Bloembergen, M. Shimono. Numerical Study of the Effect of the Shape of the Phase Diagram on the Eutectic Freezing Temperature. TEMPERATURE: ITS MEASUREMENT AND CONTROL IN SCIENCE AND INDUSTRY. (2013) 10.1063/1.4819569
- ODE, Machiko, Narayana Garimella, IKEDA Muneaki, MURAKAMI, Hideyuki, Yongho Sohn. Ternary Interdiffusion in L12-Ni3Al with Ir Alloying Addition. DEFECT AND DIFFUSION FORUM. (2008) 637-642
Presentations
- 松岡 佑亮, 小山 敏幸, 阿部 太一, 大出 真知子. 仮想現実技術を用いた科学データ可視化システムの開発. SATテクノロジー・ショーケース2026. 2026
- 松岡 佑亮, 大出 真知子, 阿部 太一, 小山 敏幸, 高橋 有紀子. FePt磁気記録材料における基板の弾性的性質と組織形成の関係解析. 日本金属学会 2025年秋期 (第177回) 講演大会. 2025
- 小林 周平, 久保田 圭, 市原 文彦, 大出 真知子, 三好 正悟, 増田 卓也. NASICON型固体電解質LATPと正極材料LiMPO4 (M = Fe, Ni)の共焼結反応分析. 2025電気化学秋季大会. 2025
Misc
- 大出 真知子. フェーズフィールド法によるSn-Biはんだ凝固過程の解析. 熱処理. 51 [5] (2011) 263-264
- 柴田 光寛, 黒田 聖治, 村上 秀之, 大出 真知子, 渡邊 誠, 坂本幸弘. . Proceedings of the 1st asian thermal spray conference. (2005) 67-68
- 大出 真知子. フィレットリフティングはなぜ起こるのか. 金属. 74 [12] (2004) 1263-1266
Society memberships
日本金属学会, 日本鉄鋼協会, 日本鋳造工学会
Research Center for Structural Materials
Study on Material Microstructure Formation Processes Using the Phase-Field Method
Computer Simulation, Phase-Field Method, Material Microstructures
Overview
Computer simulations are generally performed for one of two purposes: (1) to understand the theoretical mechanisms underlying experimental results, or (2) to visualize phenomena that are difficult to observe experimentally.
The phase-field method employed in this research can simulate microstructure formation processes regardless of the complexity of the material’s internal structure. It can be applied to a wide variety of microstructural phenomena, including dendritic growth, eutectic and peritectic solidification, order–disorder transformations, phase transformations, phase separation, and sintering.
Novelty and originality
● Applications of conventional simulations to material microstructures have been limited by mathematical challenges, such as many-body and moving-boundary problems.
● The phase-field method has enabled the simulation of complex internal microstructures in materials.
● The scope of application is being expanded through approaches such as the use of machine learning to reduce computation time and the development of theoretical models for nucleation phenomena.
Details
The phase-field method enables the analysis of a wide range of microstructures.
In Example 1, the abnormal grain-growth process of a Cu thin film on an electronic substrate is reproduced. This behavior occurs because grains with specific crystallographic orientations are constrained by the substrate.
Example 2 evaluates the effects of trace alloying elements on solidification microstructures. Elements such as Pt, which have low diffusivity, produce a strong microsegregation effect even at very low concentrations and thereby contribute to microstructural refinement.
Example 3 investigates the numerical incorporation of nucleation phenomena. Although conventional phase-field methods have had difficulty treating nucleation, this research proposes a model with low interface diffuseness, enabling more accurate predictions of material microstructures.
Summary
The phase-field method has the potential to deliver innovative results across a broad range of applications. These include not only microstructural phenomena—such as crystal growth, grain growth, sintering, dendritic, eutectic and peritectic solidification, phase transformations, and phase separation—but also nanoscale phenomena, including the formation of dislocations and defects.
