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The Phase-Field Simulation of Microstructural Evolution of Iron Intelligent Materials

2019/10/26

Time: 2019-10-21 10:00

Venue: Room 240, Complex Building No. 1, Jiuli Campus

Reporter: Wang Jie

Brief Introduction: Wang Jie, winner of Outstanding Youth Fund of Zhejiang Province in 2011, is Professor of Zhejiang University, Alexander von Humboldt Research Fellow (2007), Deputy Director of the Department of Engineering Mechanics of Zhejiang University and Deputy Director of Institute of Applied Mechanics, Zhejiang University. In 1998, Professor Wang obtained the bachelor degree in Engineering Mechanics of Xi'an Jiaotong University; in 2002, obtained the master degree in Solid Mechanics of Lanzhou University; and in 2006, obtained the doctorate of the Hong Kong University of Science and Technology. From 2007 to 2009, Professor Wang engaged in the post-doctoral research in Karlsruhe Institute of Technology (KIT), and was employed by School of Aeronautics and Astronautics, Zhejiang University after returning home in 2009. In 2012, Japan Society for the Promotion of Science (JSPS) conferred the research fellowship on Professor Wang; and from 2012 to 2014, Professor Wang served as Special Research Fellow in Kyoto University. At present, Professor Wang is the reviewer of more than 20 periodicals including Nature Materials, Nature Communications and Nano Letters. Moreover, Professor Wang, as a core member of the creative group of National Natural Science Foundation of China (NSFC), has successively taken charge of 4 NSFC projects, and engaged in 1 major NSFC project. His main research interests contain multi-field coupling mechanics of ferroic intelligent materials, phase field simulation of material's microstructure evolution, first-principles calculation of material's multi-field coupling properties, correlation between material's microstructure and macroscopic properties, and regulation of material properties. Professor Wang has published over 110 SCI papers on Annual Review of Materials Research, Nano Letters, Physical Review Letters, Acta Materialia (10 papers), JMPS, Physical Review B (15 papers) and other periodicals, and his papers have been cited for over 1,000 times in SCI.

Lecture Content: At the outset, the report will briefly introduce the basic equations of the common phase field methods and their application in the simulation of microstructure evolution of materials, and then report the phase field models of ferroelectric and ferromagnetic materials in real space developed by the research group. Getting rid of the dependence of phase field models on periodic boundary conditions in the previous Fourier Space, the phase field models in real space can be applied to the simulation of microstructure evolution and property modulation of ferroic intelligent materials with arbitrary geometric shapes and boundary conditions. By adopting the phase field models in real space, we have studied the modulation of misfit strain, grain size and geometric structure on ferroic materials' piezoelectricity, electric heat, magnetoelectricity and other multi-field coupling performances, the mechanical load's control over magnetoelectric vortex, skyrmion and other topological structures of nano ferroic materials, and the effect of crack tip domain switching on the fracture performance of ferroic materials.

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