Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
International Journal for Multiscale Computational Engineering
IF: 1.016 5-Year IF: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Print: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v1.i1.80
14 pages

Modeling Dislocation Network and Dislocation–Precipitate Interaction at Mesoscopic Scale Using Phase Field Method

C. Shen
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210
Y. Wang
Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210

ABSTRACT

In this article we discuss phase field modeling of dislocation reactions and network formation in fcc crystals, g-channel filling by dislocations during plastic deformation in Ni-based superalloys, and deformation mechanisms in multilayer thin films. The phase field method is introduced in the context of gradient thermodynamics and discussed in contrast to the Peierls–Nabarro model. General expressions of crystalline and gradient energies are introduced, and their applications to various dislocation reactions leading to network formation are presented. The critical shear stress applied to drive dislocations through the g-channels is characterized as a function of channel width, dislocation density in the channels, and lattice mismatch. The propagation behavior of threading dislocations in a multilayer microstructure is characterized as a function of misfit strain and applied stress. Different deformation mechanisms of the multilayer microstructure are predicted, ranging from a confined layer slip in individual layers at a large lattice mismatch to a co-deformation across layers at a smaller lattice mismatch. Advantages, potential new applications, and limitations of the phase field method are discussed.


Articles with similar content:

Multiscale Modeling of Point and Line Defects in Cubic Lattices
International Journal for Multiscale Computational Engineering, Vol.5, 2007, issue 3-4
John Clayton, Peter W. Chung
MOLECULAR TAGGING FLUORESCENCE VELOCIMETRY (MTFV) FOR LAGRANGIAN FLOW FIELD MAPPING INSIDE EVAPORATING MENISCUS: POTENTIAL USE FOR MICROSCALE APPLICATIONS
Journal of Flow Visualization and Image Processing, Vol.8, 2001, issue 2-3
J. S. Park, H. J. Kim
Microstructure-Based Multiscale Constitutive Modeling of γ — γ′ Nickel-Base Superalloys
International Journal for Multiscale Computational Engineering, Vol.4, 2006, issue 5-6
David L. McDowell, A.-J. Wang, M. M. Shenoy, R. S. Kumar
Multiscale Modeling of Deformation and Fracture of Polycrystalline Lamellar g-TiAl + a2-Ti3Al Alloys
International Journal for Multiscale Computational Engineering, Vol.1, 2003, issue 1
G. Cao, P. F. Joseph, M. Grujicic
THERMODYNAMIC AND PHASE BEHAVIOUR OF FLUIDS EMBEDDED WITH NANOSTRUCTURED MATERIALS
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2011, issue
Victor A. Mazur, Dmytro N. Nikitin