Lattice dislocation induced misfit dislocation evolution in semi-coherent {111} bimetal interfaces

2021 ◽  
Author(s):  
Alex Selimov ◽  
Shuozhi Xu ◽  
Youping Chen ◽  
David McDowell
Keyword(s):  
Misfit Dislocation ◽  
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.

Misfit Dislocations in the Ilmenite (FeTiO3)-Hematite (Fe2O3) System

1980 ◽  
Vol 38 ◽  
pp. 212-213 ◽  
Author(s):  
K.P.D. Lagerlöf ◽  
A.H. Heuer ◽  
T.E. Mitchell
Keyword(s):  
Misfit Dislocation ◽  
Lattice Parameters ◽  
Dislocation Network ◽  
Misfit Dislocations ◽  
Space Group ◽  
Two Phases ◽  
Hematite Fe2o3

It has been reported by Lally et. al. [1] that precipitates of hematite (Fe2O3, space group R3c) in a matrix of ilmenite (FeTiO3, space group R3) are lens shaped and flattened along the [0001]-direction. The coherency across the interface is lost by the introduction of a misfit dislocation network, which minimizes the strain due to the deviation in lattice parameters between the two phases [2]. The purpose of this paper is to present a new analysis of this network.

Rapid misfit dislocation characterization in heteroepitaxial III-V/Si thin films by electron channeling contrast imaging

2014 ◽  
Vol 104 (23) ◽  
pp. 232111 ◽  
Author(s):  
Santino D. Carnevale ◽  
Julia I. Deitz ◽  
John A. Carlin ◽  
Yoosuf N. Picard ◽  
Marc De Graef ◽  
...  
Keyword(s):  
Thin Films ◽  
Misfit Dislocation ◽  
Contrast Imaging ◽  
Electron Channeling

scholarly journals Quantitative misfit dislocation characterization with electron channeling contrast imaging

2021 ◽  
Vol 27 (S1) ◽  
pp. 912-914
Author(s):  
Ari Blumer ◽  
Marzieh Baan ◽  
Zak Blumer ◽  
Jacob Boyer ◽  
Tyler J. Grassman
Keyword(s):  
Misfit Dislocation ◽  
Contrast Imaging ◽  
Electron Channeling

scholarly journals Analytical model of the effect of misfit dislocation character on the bubble-to-void transition in metals

2016 ◽  
Vol 469 ◽  
pp. 106-111
Author(s):  
Enrique Martínez ◽  
D. Schwen ◽  
J. Hetherly ◽  
A. Caro
Keyword(s):  
Analytical Model ◽  
Misfit Dislocation

Relationship between misfit-dislocation formation and initial threading-dislocation density in GaInN/GaN heterostructures

2015 ◽  
Vol 54 (11) ◽  
pp. 115501 ◽  
Author(s):  
Motoaki Iwaya ◽  
Taiji Yamamoto ◽  
Daisuke Iida ◽  
Yasunari Kondo ◽  
Mihoko Sowa ◽  
...  
Keyword(s):  
Dislocation Density ◽  
Misfit Dislocation ◽  
Threading Dislocation ◽  
Threading Dislocation Density ◽  
Dislocation Formation

Anisotropic misfit dislocation nucleation in two-dimensional grown InAs/GaAs(001) heterostructures

1998 ◽  
Vol 73 (8) ◽  
pp. 1074-1076 ◽  
Author(s):  
Achim Trampert ◽  
Klaus H. Ploog ◽  
Eric Tournié
Keyword(s):  
Misfit Dislocation ◽  
Dislocation Nucleation ◽  
Two Dimensional

Stars and stripes. Nanoscale misfit dislocation patterns on surfaces

2002 ◽  
Vol 74 (9) ◽  
pp. 1663-1671 ◽  
Author(s):  
Raghani Pushpa ◽  
Shobhana Narasimhan
Keyword(s):  
Surface Structure ◽  
Misfit Dislocation ◽  
Domain Walls ◽  
Chemical Potential ◽  
Model System ◽  
Misfit Dislocations ◽  
Face Centered Cubic ◽  
Hexagonal Close Packed ◽  
Structure Changes ◽  
Face Centered

Close-packed metal surfaces and heteroepitaxial systems frequently display a structure consisting of regularly spaced misfit dislocations, with a network of domain walls separating face-centered cubic (fcc) and hexagonal close-packed (hcp) domains. These structures can serve as templates for growing regularly spaced arrays of nanoislands. We present a theoretical investigation of the factors controlling the size and shape of the domains, using Pt(111) as a model system. Upon varying the chemical potential, the surface structure changes from being unreconstructed to the honeycomb, wavy triangles, "bright stars", or Moiré patterns observed experimentally on Pt(111) and other systems. For the particular case of Pt(111), isotropically contracted star-like patterns are favored over uniaxially contracted stripes.

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