Long-Qing Chen
Long-Qing Chen

Long-Qing Chen
Distinguished Professor of Materials Science and Engineering
Materials Research Institute
N-321 Millennium Science Complex
(814) 863-8101
chen@matse.psu.edu
http://www.ems.psu.edu/~chen/
 

Biographical Sketch: 

Long-Qing Chen is Distinguished Professor of Materials Science and Engineering and Professor of Engineering Science and Mechanics at the Pennsylvania State University.  He is a short-term visiting Professor of Materials Science and Engineering at Tsinghua University under the short-term 1000-Scholar program, a guest Professor of Materials Science and Engineering at Zhejiang University, and a guest Professor of Physics at the Beijing University of Science and Technology in China. He received his B.S. degree in Materials Science and Engineering from Zhejiang University in China in 1982.  After spending one year as an assistant instructor at Zhejiang University, he came to the United States in 1983 and received his M.S. degree in Materials Science and Engineering from the State University of New York at Stony Brook in 1985 and a Ph.D. degree in Materials Science and Engineering from the Massachusetts Institute of Technology (MIT) in 1990.  After a two-year post-doc appointment with Professor Armen G. Khachaturyanat Rutgers University, he joined the faculty at Penn State as an Assistant Professor of Materials Science and Engineering in 1992.  He was promoted to Associated Professor in 1998 and Professor in 2002. Professor Chen teaches undergraduate thermodynamics of materials and graduate kinetics of materials processes and also co-teaches one graduate course and one undergraduate course in computational materials science in the department.  Professor Chen's main research interest is developing multiscale computational models for predicting microstructure evolution in materials using a combination of atomistic/first-principles calculations and phase-field methods.  In particular, he is interested in microstructure evolution during phase transformations, grain growth, Ostwald ripening, ferroelectric and multiferroic domain switching, and coupled ionic/electronic transport in electrochemical systems.  His research group collaborates actively with numerous experimental groups, applied mathematicians, and other fellow computational materials scientists and physicists as well as with more than a dozen companies and national labs.  Professor Chen has published over 350 authored or co-authored papers (H-index = 51, Number of Citations >10,000), 1 patent licensed by Intel, and co-edited 3 books in the area of computational materials science of microstructures and properties.  He has given more than 200 invited talks including 6 at the Gordon Research Conferences.  Professor Chen's current and former graduate students have received more than 40 awards including Materials Research Society Graduate Student Gold and Silver Medal Awards, American Ceramic Society Graduate Excellence in Materials Science Awards, Acta Materialia best student paper award, Penn State Materials Research Institute best Ph.D. thesis research award, TMS Young Leader Award, etc.  Professor Chen received numerous awards for his work including:

  • ONR Young Investigator Award (1995)
  • NSF special research creativity award (1999)
  • Wilson Award for Excellence in Research from his college (2000)
  • University Faculty Scholar Medal in Engineering at Penn State (2003)
  • Outstanding Overseas Young Scholar by the Chinese Natural Science Foundation (2004)
  • Changjiang Chair Professorship by the Chinese Ministry of Education (2004)
  • Guest Professor at Beijing University of Science and Technology (2004)
  • Guggenheim Fellow (2005)
  • Royal Society Kan Tong Po Fellowship at Hong Kong Polytechnic University (2005)
  • ASM Materials Research Silver Medal (2006)
  • American Physical Society Fellow (2008)
  • D. B. Robinson Distinguished Lecture at University of Alberta (2010)
  • Materials Science and Engineering Departmental Teaching Award of Students’ Choice (2010)
  • TMS EMPMD Distinguished Scientist/Engineer Award (2011)
  • Short-Term 1000-Talent Program Visiting Professorship at Tsinghua University (2011)
  • Bo Yugang Visiting Professorship at Zhejiang University (2012)
  • ASM Fellow (2012)
  • Penn State Distinguished Professorship (2013)
  • Materials Research Society (MRS) Fellow (2013)
Research Interests: 
  • Computational materials science
  • Phase-field method
  • Multiscale modeling of microstructure evolution integrating first-principles calculations, and phase-field methods, and microstructure-property relationships
  • Phase transformations
  • Deformation twinning
  • Microstructure coarsening
  • Structural alloys (Ti-alloys, Ni-alloys, Al-alloys and Mg-alloys)
  • Domain structures in ferroelectric and magnetic materials, multiferroics
  • Electrochemical transport in dielectrics, batteries and solid oxide fuel cells.
     

 

Areas of Research: 

Dr. Chen’s main research interest is in the fundamental understanding of the thermodynamics and kinetics of phase transformations and mesoscale microstructure evolution in bulk solid and thin films using computer simulations. Essentially all engineering materials contain certain types of microstructures, and our success of designing new materials is largely dependent on our ability to control them. Microstructure is a general term that refers to a spatial distribution of structural features that can be phases of different compositions and/or crystal structures, or grains of different orientations, or domains of different structural variants, or domains of different electrical or magnetic polarization, as well as structural defects such as dislocations. It is the size, shape, and spatial arrangement of the local structural features that determine the physical properties of a material such as mechanical, electrical, magnetic and optical properties. For the last decade, Dr. Chen’s group at Penn State is particularly active in developing phase-field models for microstructure evolution during various materials processes including grain growth, coherent precipitation, ferroelectric domain formation, particle coarsening, domain structure evolution in thin films, phase transformation in the presence of structural defects, and effect of stress on microstructure evolution. Current research focus is on the effect of stress/strain on ferroelectric phase transitions and domain structure evolution in ferroelectric and multiferroic thin films, domain structures in ferromagnetic shape memory alloys, electrode microstructure evolution in solid oxide fuel cells and batteries, precipitate microstructure evolution in Al-, Mg-, Ti- and Ni-alloys, strain-dominated morphological evolution, effect of defects such as dislocations on microstructure evolution. Dr. Chen’s group collaborates extensively with experimentalists and with industry.

Technology Impacted By Research: 

Alloy development for aerospace and automobile iapplications
Ferroelectric and ferromagnetic thin films for memory, capacitor and electromechanical system applications
Solid oxide fuel cells and batteries

 

Journal Articles and Publications: 
  • N. Balke, B. Winchester, W. Ren, Y. H. Chu, A. N. Morozovska, E. A. Eliseev, M. Huijben, R. K. Vasudevan, P. Maksymovych, J. Britson, S. Jesse, I. Kornev, R. Ramesh, L. Bellaiche, L. Q. Chen, and S. V. Kalinin, Enhanced electric conductivity at ferroelectric vortex cores in BiFeO3, Nature Physics, 2012. 8():p. 81-88
  • L.Y. Liang, Y. Qi, F. Xue, S. Bhattacharya, S.J. Harris, and L.Q. Chen, Nonlinear phase-field model for electrode-electrolyte interface evolution. Physical Review E, 2012. 86(5).
  • K. Chang, C.E. Krill, Q. Du, and L.Q. Chen, Evaluating microstructural parameters of three-dimensional grains generated by phase-field simulation or other voxel-based techniques. Modelling and Simulation in Materials Science and Engineering, 2012. 20(7).
  • B.S. Fromm, K. Chang, D.L. Mcdowell, L.Q. Chen, and H. Garmestani, Linking phase-field and finite-element modeling for process structure property relations of a Ni-base superalloy. Acta Materialia, 2012. 60(17): p. 5984-5999.
  • 24. Y.H. Wen, L.Q. Chen, and J.A. Hawk, Phase-field modeling of corrosion kinetics under dual-oxidants. Modelling and Simulation in Materials Science and Engineering, 2012. 20(3).
  • H. Yang, S. Huang, X. Huang, F.F. Fan, W.T. Liang, X.H. Liu, L.Q. Chen, J.Y. Huang, J. Li, T. Zhu, and S.L. Zhang, Orientation-Dependent Interfacial Mobility Governs the Anisotropic Swelling in Lithiated Silicon Nanowires. Nano Letters, 2012. 12(4): p. 1953-1958.
  • J. M. Hu, Z. Li, L. Q. Chen, and C. W. Nan, High-density magnetoresistive random access memory operating at ultralow voltage at room temperature , Nature Communications, 2011. 2:Art. No. 553
  • T. W. Heo, S. Bhattacharyya, and L.Q. Chen, A phase field study of strain energy effects on solute-grain boundary interactions. Acta Materialia, 2011. 59(20): p. 7800-7815.
  • C. T. Nelson, B. Winchester, Y. Zhang, S.J. Kim, A. Melville, C. Adamo, C.M. Folkman, S.H. Baek, C.B. Eom, D.G. Schlom, L.Q. Chen, and X.Q. Pan, Spontaneous Vortex Nanodomain Arrays at Ferroelectric Heterointerfaces. Nano Letters, 2011. 11(2): p. 828-834.
  • S.H. Baek, H.W. Jang, C.M. Folkman, Y.L. Li, B. Winchester, J.X. Zhang, Q. He, Y.H. Chu, C.T. Nelson, M.S. Rzchowski, X.Q. Pan, R. Ramesh, L.Q. Chen, and C.B. Eom, Ferroelastic switching for nanoscale non-volatile magnetoelectric devices. Nature Materials, 2010. 9(4): p. 309-314.
  • R. J. Zeches, M.D. Rossell, J.X. Zhang, A.J. Hatt, Q. He, C.H. Yang, A. Kumar, C.H. Wang, A. Melville, C. Adamo, G. Sheng, Y.H. Chu, J.F. Ihlefeld, R. Erni, C. Ederer, V. Gopalan, L.Q. Chen, D.G. Schlom, N.A. Spaldin, L.W. Martin, and R. Ramesh, A Strain-Driven Morphotropic Phase Boundary in BiFeO3. Science, 2009. 326(5955): p. 977-980.
  • L. Q. Chen, Phase-field method of phase transitions/domain structures in ferroelectric thin films: A review. Journal of the American Ceramic Society, 2008. 91(6): p. 1835-1844.
  • D. G. Schlom, L.Q. Chen, C.B. Eom, K.M. Rabe, S.K. Streiffer, and J.M. Triscone, Strain tuning of ferroelectric thin films. Annual Review of Materials Research, 2007. 37: p. 589-626.
  • V. Vaithyanathan, C. Wolverton, and L.Q. Chen, Multiscale modeling of precipitate microstructure evolution. Physical Review Letters, 2002. 88(12).
  • L. Q. Chen, Phase-field models for microstructure evolution. Annual Review of Materials Research, 2002. 32: p. 113-140.

 

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