Image Force on a Lattice Dislocation Due to a Grain Boundary in Hexagonal Metals

1998 ◽  
Vol 294-296 ◽  
pp. 689-692
Author(s):  
O. Khalfallah ◽  
L. Priester
Keyword(s):  
Grain Boundary ◽  
Image Force ◽  
Lattice Dislocation ◽  
Hexagonal Metals

Image force on a lattice dislocation due to a grain boundary in b.c.c. metals

1993 ◽  
Vol 67 (1) ◽  
pp. 231-250 ◽  
Author(s):  
O. Khalfallah ◽  
M. Condat ◽  
L. Priester
Keyword(s):  
Grain Boundary ◽  
Image Force ◽  
Lattice Dislocation

scholarly journals The lattice dislocation trapping mechanism at the ferrite/cementite interface in the Isaichev orientation relationship

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jaemin Kim ◽  
Hadi Ghaffarian ◽  
Keonwook Kang
Keyword(s):  
Stress Field ◽  
Orientation Relationship ◽  
Misfit Dislocation ◽  
Image Force ◽  
Initial Position ◽  
Lattice Dislocation ◽  
Atomistic Simulations ◽  
Interface Shear ◽  
Linear Elasticity Theory ◽  
Trapping Mechanism

AbstractWe analyze the lattice dislocation trapping mechanism at the ferrite/cementite interface of the Isaichev orientation relationship by atomistic simulations combined with the anisotropic linear elasticity theory and disregistry analysis. We find that the lattice dislocation trapping ability is varied by initial position of the lattice dislocation. The lattice dislocation near the interface is attracted to the interface by the image force generated by the interface shear, while the lattice dislocation located far is either attracted to or repelled from the interface, or even oscillates around the introduced position, depending on the combination of the stress field induced by the misfit dislocation array and the image stress field induced by the lattice dislocation.

scholarly journals The Lattice Dislocation Trapping Mechanism at the Ferrite/Cementite Interface: The Isaichev Orientation Relationship

2021 ◽  
Author(s):  
Jaemin Kim ◽  
Hadi Ghaffarian ◽  
Keonwook Kang
Keyword(s):  
Stress Field ◽  
Orientation Relationship ◽  
Misfit Dislocation ◽  
Image Force ◽  
Initial Position ◽  
Lattice Dislocation ◽  
Atomistic Simulations ◽  
Interface Shear ◽  
Linear Elasticity Theory ◽  
Trapping Mechanism

Abstract We analyze the lattice dislocation trapping mechanism at the ferrite/cementite interface (FCI) of the Isaichev orientation relationship (OR) by atomistic simulations combined with the anisotropic linear elasticity theory and disregistry analysis. We find that the lattice dislocation trapping ability is varied by initial position of the lattice dislocation. The lattice dislocation near the interface is attracted to the interface by the image force generated by the interface shear, while the lattice dislocation located far is either attracted to or repelled from the interface, or even oscillates around the introduced position, depending on the combination of the stress field induced by the misfit dislocation array and the image stress field induced by the lattice dislocation.

Grain Boundary Dislocation Structure and Motion in an Aluminum Σ=3 Bicrystal

1996 ◽  
Vol 54 ◽  
pp. 328-329
Author(s):  
D. L. Medlin ◽  
S.M. Foiles ◽  
C. Barry Carter
Keyword(s):  
Grain Boundary ◽  
Rigid Body ◽  
Twin Boundary ◽  
Dislocation Structure ◽  
Lattice Dislocation ◽  
Boundary Dislocation ◽  
Perfect Lattice ◽  
Structure And Motion ◽  
Rigid Body Displacement ◽  
Image Position

A lattice dislocation may interact with a grain boundary leaving either a residual dislocation or a step or both. These products may then contribute to further deformation by themselves moving along the interfaces. For instance, Pond1 observed the dissociation of a perfect lattice dislocation in an aluminum Σ=3 (211) incoherent twin boundary by a reaction of the type:Furthermore, the a/3[111] dislocation was observed to dissociate into two partial grain boundary dislocations (GBD), with Burgers vectors of approximately 2a/9[111] and a/9[111], separating structurally degenerate regions of opposite rigid body displacement.

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