Topic: Phase-field Method and Its Applications to Modeling and Predicting Microstructures and Properties

Speaker: Professor Long-Qing Chen，

　　　　　Department of Materials Science and Engineering and Materials Research Institute,
Penn State University,USA

Abstract:

Many important engineering materials are designed by controlling their phase transformations and microstructure evolution. Examples include the design of mechanical properties through solid-state precipitation reactions in alloys such as Ni-based superalloys and age-hardened Al-alloys, and the useful dielectric properties and electro-mechanical coupling effects by manipulating the phase transitions and domain structures in ferroelectric crystals.  For the past 20 years, phase-field approach has been established as the method of choice for modeling complex three-dimensional microstructure evolution during a wide variety of materials processes.  In this presentation, a brief overview of the phase-field approach and its applications will be provided. A number of examples of coupling phase-field simulations and experimental measurements will be presented. It will be demonstrated that one can use the phase-field method to help interpreting experimental observations as well as to provide guidance to achieve desirable transition temperatures and specific domain/microstructure structures in a wide variety of materials systems.  The possibility to employ the phase-field method to directly compute the effective responses of a microstructure and to model devices will be discussed.

Long-Qing Chen is the Donald W. Hamer Professor of Materials Science and Engineering, Professor of Engineering Science and Mechanics, and Professor of Mathematics at Penn State.  He received his PhD from MIT in Materials Science and Engineering and joined Penn State in 1992 after a 2-year postdoctoral appointment at Rutgers University. He has published over 450 papers in the area of computational microstructure evolution and multiscale modeling of metallic alloys, oxides, and energy materials (Citations: Web of Sciences  > 16,500, H-inde x = 65; Google Scholar: > 23,000, H-index = 74).  For his contributions, he has received numerous awards including outstanding Overseas Young Scientist Award by Natural Science Foundation of China, Changjiang Lecture Professorship by the Chinese Ministry of Education, Short-term Qianren Visiting Professor at Tsinghua University under the 1000-talent program, Fellow of the Materials Research Society (MRS), American Physical Society (APS), American Society for Metals (ASM), and American Ceramic Society, University Faculty Scholar Medal and Distinguished Professorship at Penn State, Guggenheim Fellowship, ASM Materials Research Silver Medal, TMS EMPMD Distinguished Scientist Award, and the 2014 MRS Materials Theory Award.