Characterization and visualization of the lattice misfit associated with dislocation cores

被引:134
作者
Hartley, CS
Mishin, Y
机构
[1] USAF, Off Sci Res, Directorate Aerosp & Mat Sci, Arlington, VA 22203 USA
[2] George Mason Univ, Sch Comp Sci, Fairfax, VA 22030 USA
关键词
dislocation structure; simulation; modeling;
D O I
10.1016/j.actamat.2004.11.027
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Atomic misfit associated with a crystal dislocation is manifested by displacements of atoms from their positions in the perfect lattice. The discrete character of the crystal lattice and the nature of interatomic bonds distribute this misfit over the plane normal to the dislocation line. The Nye tensor, which describes the distribution of the resultant Burgers vector across a plane normal to the dislocation line, provides an excellent means of describing the spatial variation of the misfit. Relevant components of the Nye tensor are calculated from atomic positions in the dislocated crystal, represented by contour plots, and contrasted with the corresponding quantities obtained from a local continuum model. The comparison demonstrates that spatial distributions of components of the Nye tensor provide an accurate and instructive means of representing dislocation core structures. A numerical integration of these distributions permits an accurate calculation of the Burgers vector without constructing a Burgers circuit. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:1313 / 1321
页数:9
相关论文
共 27 条
[1]  
Bilby B. A., 1960, PROGR SOLID MECH, V1, P330
[2]   CONTINUOUS DISTRIBUTIONS OF DISLOCATIONS - A NEW APPLICATION OF THE METHODS OF NON-RIEMANNIAN GEOMETRY [J].
BILBY, BA ;
BULLOUGH, R ;
SMITH, E .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1955, 231 (1185) :263-273
[3]   Nodal effects in dislocation mobility [J].
Bulatov, VV ;
Cai, W .
PHYSICAL REVIEW LETTERS, 2002, 89 (11) :1-115501
[4]  
BULLOUGH R, 1965, UNPUB ELASTICITY CON
[5]  
COOPER WD, 1976, COMPUTER SIMULATIO 2, V20, P1226
[6]  
Daw M. S., 1986, MODELING ENV EFFECTS, P99
[7]   EMBEDDED-ATOM METHOD - DERIVATION AND APPLICATION TO IMPURITIES, SURFACES, AND OTHER DEFECTS IN METALS [J].
DAW, MS ;
BASKES, MI .
PHYSICAL REVIEW B, 1984, 29 (12) :6443-6453
[8]  
ESHELBY JD, 1949, PHILOS MAG, V40, P903
[9]  
FISCHER O, 1969, SURVEY APPLICABLE MA, P1301
[10]   LINEAR FORCE AND DISLOCATION MULTIPOLES IN ANISOTROPIC ELASTICITY [J].
HARTLEY, CS .
JOURNAL OF APPLIED PHYSICS, 1975, 46 (03) :1008-1012