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Long-Qing
Chen
Professor of Materials Science and Engineering
102 Steidle Building
814-863-8101
chen@matse.psu.edu |
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Research
Interests:
• Thermodynamics
and kinetics of phase transformations
• Phase-field simulation
of domain structure and
microstructure
evolution
• Ferroelectric thin films
• Alloy precipitations
• Martensitic transformations
• Interactions between defect
and phase microstructures
• Multiscale modeling |
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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 polarizations,
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,
precipitate microstructure evolution in Al- 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. |
Technologies
impacted by research:
• New alloy development
for aircraft engines and automobile industries
• Ferroelectric
and ferromagnetic thin films
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Journal
Articles and Publications:
1. S. Y. Hu and L. Q. Chen, “/Spinodal Decomposition in a Film
with
Periodically Distributed Interfacial Dislocations/”, Acta
Materialia 52, 3069-3074 (2004).
2. V. Vaithynanathan, C. Wolverton, and L. Q. Chen, /Multiscale
Modeling of Precipitate Microstructure Evolution/, Physical Review
Letters *88*, 125503 (2002).
3. Y. L. Li, S. Y. Hu, Z. K. Liu, and L. Q. Chen, /Effect of
Substrate Constraint on the Stability and Evolution of
Ferroelectric Domain Structures in Thin Films/, Acta Materalia,
*50*, 395-411 (2002).
4. L. Q. Chen, /Phase-field Models of Microstructure Evolution//,/
Annual Review of Materials Research *32*, 113-140 (2002).
5. C. E. Krill, C. E. and L. Q. Chen, /Computer Simulation of 3-D
Grain Growth Using a Phase-field Model/, Acta Materialia 50,
3057–3073 (2002). |
