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phase-field modeling of dendritic growth of magnesium alloys with a parallel-adaptive mesh refinement algorithm

China Foundry 2021年第6期18卷 541-549页

作者： Bing-hui Tian Meng-wu Wu Ang Zhang Zhi-peng Guo Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

A two-dimensional phase field(PF)model was developed to simulate the dendritic solidification in magnesium alloy with hcp crystal *** applying a parallel-adaptive mesh refinement(Para-AMR)algorithm,the computational efficiency of the numerical model was greatly *** on the PF model,a series of simulation cases were conducted and the results showed that the anisotropy coefficient and coupling coefficient had a great influence on the dendritic morphology of magnesium *** dendritic growth kinetics was determined by the undercooling and equilibrium solute partition coefficient.A significant finding is acquired that with a large undercooling,the maximum solute concentration is located on both sides of the dendrite tip in the liquid,whereas the maximum solute concentration gradient is located right ahead of the dendrite tip in the *** dendrite tip growth velocity decreases with the increase of the equilibrium solute partition coefficient,while the variation trend of the dendrite tip radius is the *** analysis was carried out relating to the dendritic morphology and growth kinetics,and the simulated results are consistent with the theoretical models proposed in the previously published works.

关键词： magnesium alloy dendritic growth phase-field modeling solidification

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Multiscale modeling of thermo-hydromechanical behavior of clayey rocks and application to geological disposal of radioactive waste

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 1-19页

作者： Jianfu Shao Zhan Yu Minh-Ngoc Vu University of Lille CNRSEC LilleLaMcubeUMR901359000LilleFrance Institut Universitaire de France(IUF) ParisFrance Andra Chatenay MalabryFrance

This work is devoted to numerical analysis of thermo-hydromechanical problem and cracking process in saturated porous media in the context of deep geological disposal of radioactive *** fundamental background of thermo-poro-elastoplasticity theory is first *** emphasis is put on the effect of pore fluid pressure on plastic deformation.A micromechanics-based elastoplastic model is then presented for a class of clayey rocks considered as host *** on linear and nonlinear homogenization techniques,the proposed model is able to systematically account for the influences of porosity and mineral composition on macroscopic elastic properties and plastic yield *** initial anisotropy and time-dependent deformation are also taken into *** induced cracking process is described by using a non-local damage model.A specific hybrid formulation is proposed,able to conveniently capture tensile,shear and mixed *** particular,the influences of pore pressure and confining stress on the shear cracking mechanism are taken into *** proposed model is applied to investigating thermo-hydromechanical responses and induced damage evolution in laboratory tests at the sample *** the last part,an in situ heating experiment is analyzed by using the proposed *** results are compared with experimental data and field measurements in terms of temperature variation,pore fluid pressure change and induced damaged zone.

关键词： Radioactive waste Geological disposal Thermo-hydromechanical coupling Clayey rocks Damage and cracking phase-field modeling

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Microstructure analyses and phase-field simulation of partially divorced eutectic solidification in hypoeutectic Mg-Al Alloys

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Journal of Magnesium and Alloys 2022年第6期10卷 1672-1679页

作者： Joo-Hee Kang Jiwon Park Kyung Song Chang-Seok Oh Oleg Shchyglo Ingo Steinbach Korea Institute of Materials Science Changwon 51508Republic of Korea Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University Bochum44801 BochumGermany

In this study the partially divorced eutectic microstructure ofα-Mg andβ-Mg17Al12was investigated by electron backscatter diffraction,transmission electron microscopy,and phase-field modeling in hypoeutectic Mg-Al *** orientation relationships between the individual eutecticαgrains,eutecticβphase,and primaryαgrains were *** the amount of eutectic morphology is primarily determined by the Al content,the in-depth microstructure analyses and the phase-field simulation suggest non-interactive nucleation and growth of eutecticαphase in theβphase grown on the interdendritic primaryα***,phase-field simulations showed a preferred nucleation sequence where theβphase nucleates first and subsequently triggers the nucleation of eutecticαphase at the movingβphase solidification front,which supports the microstructural analysis results.

关键词： Mg-Al alloy Partially divorced eutectic Solidification Electron backscatter diffraction phase-field modeling

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A review on different theoretical models of electrocaloric effect for refrigeration

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Frontiers in Energy 2023年第4期17卷 478-503页

作者： Cancan SHAO A.A.AMIROV Houbing HUANG School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China Amirkhanov Institute of Physics Daghestan Scientific Center Russian Academy of SciencesMakhachkala367003Russia

The performance parameters for characterizing the electrocaloric effect are isothermal entropy change and the adiabatic temperature change,*** paper reviews the electrocaloric effect of ferroelectric materials based on different theoretical ***,it provides four different calculation scales(the first-principle-based effective Hamiltonian,the Landau-Devonshire thermodynamic theory,phase-field simulation,and finite element analysis)to explain the basic theory of calculating the electrocaloric ***,it comprehensively reviews the recent progress of these methods in regulating the electrocaloric effect and the generation mechanism of the electrocaloric ***,it summarizes and anticipates the exploration of more novel electrocaloric materials based on the framework constructed by the different computational methods.

关键词： electrocaloric effect effective Hamiltonian phase-field modeling different theoretical models

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phase-field study of crystallographic texturing in piezoelectric polycrystals

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Journal of Advanced Dielectrics 2022年第4期12卷 5-10页

作者： Meixin Wang Tian Xia Liwei D.Geng Department of Materials Science and Engineering Sichuan University-Pittsburgh Institute Sichuan University ChengduSichuan 610065P.R.China

Crystallographic texturing enables the design of piezoelectric polycrystals that outperform traditional random polycrystals by exhibiting outstanding piezoelectric *** this work,phase-field modeling and computer simulation were employed to study the effect of crystallographic texture on the piezoelectric properties of ferroelectric polycrystals at the domain *** evolutions for single crystal,random polycrystal,and textured polycrystal are systematically *** simulations reveal that the[001]-textured polycrystal can fully exploit the intrinsic anisotropic properties of piezoelectric materials by exhibiting a piezoelectric coefficient that is as large as that of single crystal while being much larger than that of random *** better understand the mechanism of piezoelectricity enhancement by crystallographic texturing,a theoretical analysis based on Landau theory is *** comparison with random polycrystal,the textured polycrystal manifests a flatter energy landscape and thus possesses a higher piezoelectric coefficient.

关键词： phase-field modeling piezoelectric polycrystal crystallographic texture textured polycrystal.

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