Wetting and capillarity driven grain rearrangement and microstructure evolution during liquid phase sintering: Solubility and particle size effects

液相烧结过程中润湿和毛细作用驱动的晶粒重排和微观结构演变：溶解度和粒径效应

• 批准号: 273088361
• 负责人: Professor Dr. Fathollah Varnik
• 金额: --
• 依托单位: Lehrstuhl für Skalenübergreifende Thermodynamische und Kinetische Simulation
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/273088361?language=en
• 关键词: Wetting; capillarity; driven; grain; rearrangement

Liquid phase sintering represents a challenge to numerical simulations as it involves phase transformation kinetics (melting/solidification), wetting and capillarity and rigid body motion. Despite this complexity, we have recently implemented an efficient hybrid method to adequately tackle this problem. The approach combines the powerful phase field method for the simulation of microstructure evolution with the multiphase lattice Boltzmann method, well-known for adequate study of fluid flow and capillarity in complex geometries. One of the key issues here is how the liquid-assisted dissociation of the bonds between solid grains and the resulting increase in grain mobility influence the evolution of the microstructure. Furthermore, effects of capillary bridges and the resulting mutual attraction between solid particles shall be investigated. Important questions here concern the influence of hard/soft particle size ratio and polydispersity on microstructure evolution and compaction dynamics.

由于液相烧结涉及相变动力学(熔融/凝固)、润湿和毛细作用以及刚体运动，因此对数值模拟是一个挑战。尽管有这种复杂性，我们最近实施了一种有效的混合方法来充分解决这个问题。该方法结合了用于模拟微观结构演化的强大相场方法和多相格子Boltzmann方法，该方法以充分研究复杂几何形状中的流体流动和毛细作用而闻名。这里的关键问题之一是液体辅助的固体颗粒之间的键的解离以及由此导致的颗粒迁移率的增加如何影响微观结构的演变。此外，应研究毛细管桥的影响以及由此产生的固体颗粒之间的相互吸引。这里的重要问题涉及硬/软颗粒尺寸比和多分散性对微观结构演变和压实动力学的影响。

项目成果

Simulation of capillary-driven kinetics with multi-phase-field and lattice Boltzmann method

• DOI: 10.1088/1361-651x/ab9bb3
• 发表时间: 2019-02
• 期刊: Modelling and Simulation in Materials Science and Engineering
• 影响因子: 1.8
• 作者: Raphael Schiedung;M. Tegeler;D. Medvedev;F. Varnik

Controlling bubble coalescence in metallic foams: A simple phase field-based approach

• DOI: 10.1016/j.commatsci.2019.109437
• 发表时间: 2020-02-15
• 期刊: COMPUTATIONAL MATERIALS SCIENCE
• 影响因子: 3.3
• 作者: Vakili, Samad;Steinbach, Ingo;Varnik, Fathollah
• 通讯作者: Varnik, Fathollah

Thin interface limit of the double-sided phase-field model with convection

• DOI: 10.1098/rsta.2019.0540
• 发表时间: 2020-05-15
• 期刊: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
• 影响因子: 5
• 作者: Subhedar, Amol;Galenko, Peter K.;Varnik, Fathollah
• 通讯作者: Varnik, Fathollah

Diffuse interface models of solidification with convection: The choice of a finite interface thickness

• DOI: 10.1140/epjst/e2019-900099-5
• 发表时间: 2019-09
• 期刊: The European Physical Journal Special Topics
• 作者: A. Subhedar;P. Galenko;F. Varnik