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説明:

A thorough understanding and control of the microstructural evolution during sintering is essential for improving the properties of various sintered materials. In this study, a new multi-phase-field (MPF) model of sintering that applies to both solid-state sintering (SSS) and liquid-phase sintering (LPS) in multiphase and multicomponent systems was developed. The MPF model incorporates the advection term to account for the rigid-body motion (RBM) of the sintered particles. Moreover, the MPF model provides thermodynamically reasonable results of phase transformation and solute diffusion when coupled with a thermodynamic database. The effect of incorporating the RBM was validated by evaluating the neck growth and densification rates obtained from the simulation results of SSS. The MPF simulation results of the initial stage of LPS demonstrated that the a) MPF model could reproduce the densification behavior, which depends on the phase transformation between the solid and liquid phases, and b) RBM is an important factor in reproducing the densification behavior. A long-term MPF simulation of the LPS also demonstrated that the microstructural evolution, including three densification-related mechanisms—contact flattening, Ostwald ripening, and solid-state bonding—could be analyzed from the initial to final stages of the LPS. This study is expected to advance the sintering process applicable to multiphase and multicomponent systems.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Sintering, Multicomponent, CALPHAD, Phase-field modeling

刊行年月日: 2024-08-14

出版者: Elsevier BV

掲載誌:

• Materials Today Communications (ISSN: 23524928) vol. 40 110116

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.mtcomm.2024.110116

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更新時刻: 2024-09-18 12:30:08 +0900

MDRでの公開時刻: 2024-09-18 12:30:08 +0900