Effect of twin boundary-dislocation and twin boundary-solute atom interaction on detwinning of Mg-2Gd-2Y-0.3Zr alloy

2019 ◽  
Vol 770 ◽  
pp. 483-489 ◽  
Author(s):  
Xudong Liu ◽  
Jian Chen ◽  
Xiulan Liu ◽  
Haoyue Wu ◽  
Wei Yang ◽  
...  
Keyword(s):  
Twin Boundary ◽  
Solute Atom ◽  
Boundary Dislocation ◽  
Atom Interaction

Effect of Twin Boundary–Dislocation–Solute Interaction on Detwinning in a Mg–3Al–1Zn Alloy

2016 ◽  
Vol 32 (12) ◽  
pp. 1239-1244 ◽  
Author(s):  
Jing Xu ◽  
Bo Guan ◽  
Huihui Yu ◽  
Xuezhen Cao ◽  
Yunchang Xin ◽  
...  
Keyword(s):  
Twin Boundary ◽  
Boundary Dislocation ◽  
Solute Interaction

Q−1 spectra connected with C under solute atom interaction

1994 ◽  
Vol 211-212 ◽  
pp. 33-36 ◽  
Author(s):  
P. Gondi ◽  
R. Montanari
Keyword(s):  
Solute Atom ◽  
Atom Interaction

The Electrical Activity at Twin Boundaries in Silicon

1981 ◽  
Vol 5 ◽  
Author(s):  
B. Cunningham ◽  
H.P. Strunk ◽  
D.G. Ast
Keyword(s):  
Electrical Activity ◽  
Twin Boundary ◽  
Boundary Dislocation ◽  
Twin Boundaries ◽  
Recombination Centers ◽  
Minority Carriers

ABSTRACTAlthough coherent twin boundaries in silicon are electrically inactive, dislocations in the boundaries can act as efficient recombination centers for minority carriers. Different twin boundary dislocation arrangements have been studied by EBIC and TEM. It is found that the observed EBIC contrast is dependent not only on the arrangement of the dislocations in the boundaries but also on the inclination of the boundaries to the surface. It is shown that different defect configurations can produce similar EBIC contrast.

Grain Boundary Dislocation Structure and Motion in an Aluminum Σ=3 [011] Bicrystal

1996 ◽  
Vol 466 ◽  
Author(s):  
D. L. Medlin ◽  
S. M. Foiles ◽  
C. B. Carter
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Grain Boundary ◽  
Twin Boundary ◽  
Defect Structure ◽  
Boundary Dislocation ◽  
Structure And Motion ◽  
Transmission Electron ◽  
Atomistic Calculations

ABSTRACTHigh-resolution transmission electron microscopy (HRTEM) observations are presented of a/3[111] grain-boundary dislocations in an aluminum Σ=3[011] bicrystal. These dislocations are present on both (111) (coherent twin) and (211) (incoherent twin) facets of the bicrystal boundary. The dislocations on the coherent twin facet migrate by a climb process that increases the thickness of the twinned material. These dislocations originate on a Σ=3 (211) incoherent twin boundary where they are closely spaced and dissociated in a wide core configuration. Atomistic calculations of the defect structure and interaction of multiple a/3[111] grain boundary dislocations are discussed.

scholarly journals Ab Initio Modeling of Y and O Solute Atom Interaction in Small Clusters within the bcc Iron Lattice

2018 ◽  
Vol 256 (5) ◽  
pp. 1800346 ◽  
Author(s):  
Yuri A. Mastrikov ◽  
Maksim N. Sokolov ◽  
Eugene A. Kotomin ◽  
Aleksejs Gopejenko ◽  
Yuri F. Zhukovskii
Keyword(s):  
Ab Initio ◽  
Solute Atom ◽  
Ab Initio Modeling ◽  
Bcc Iron ◽  
Atom Interaction ◽  
Small Clusters

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.

Two Investigations into Grain Boundary Structure

1977 ◽  
Vol 35 ◽  
pp. 688-691
Author(s):  
P. Humble
Keyword(s):  
Grain Boundary ◽  
Dark Field ◽  
Boundary Structure ◽  
Boundary Dislocation ◽  
Bright Field ◽  
Intrinsic Structure ◽  
Weak Beam ◽  
Grain Boundary Structure ◽  
Independent Information ◽  
Diffraction Patterns

There has been sustained interest over the last few years into both the intrinsic (primary and secondary) structure of grain boundaries and the extrinsic structure e.g. the interaction of matrix dislocations with the boundary. Most of the investigations carried out by electron microscopy have involved only the use of information contained in the transmitted image (bright field, dark field, weak beam etc.). Whilst these imaging modes are appropriate to the cases of relatively coarse intrinsic or extrinsic grain boundary dislocation structures, it is apparent that in principle (and indeed in practice, e.g. (1)-(3)) the diffraction patterns from the boundary can give extra independent information about the fine scale periodic intrinsic structure of the boundary.In this paper I shall describe one investigation into each type of structure using the appropriate method of obtaining the necessary information which has been carried out recently at Tribophysics.

Twin boundary structure of a Y-Ba-Cu-O superconductor

1989 ◽  
Vol 47 ◽  
pp. 168-169
Author(s):  
Yimei Zhu ◽  
Masaki Suenaga ◽  
R. L. Sabatini ◽  
Youwen Xu
Keyword(s):  
Twin Boundary ◽  
Fine Particles ◽  
Imaging Techniques ◽  
Fine Powder ◽  
Orthorhombic Phase ◽  
Boundary Structure ◽  
Crystallographic Axis ◽  
System A ◽  
High Resolution Structure ◽  
Electron Microscopes

The (110) twin structure of YBa2Cu3O7 superconductor oxide, which is formed to reduce the strain energy of the tetragonal to orthorhombic phase transformation by alternating the a-b crystallographic axis across the boundary, was extensively investigated. Up to now the structure of the twin boundary still remained unclear. In order to gain insight into the nature of the twin boundary in Y-Ba-Cu-O system, a study using electron diffraction techniques including optical and computed diffractograms, as well as high resolution structure imaging techniques with corresponding computer simulation and processing was initiated.Bulk samples of Y-Ba-Cu-O oxide were prepared as described elsewhere. TEM specimens were produced by crushing bulk samples into a fine powder, dispersing the powder in acetone, and suspending the fine particles on a holey carbon grid. The electron microscopy during this study was performed on both a JEOL 2000EX and 2000FX electron microscopes operated at 200 kV.

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