Creation and Motion of Edge Dislocations in Copper Single Crystals

1997 ◽  
Vol 505 ◽  
Author(s):  
Masaodoyama ◽  
Yoshiaki Kogure ◽  
Tadatoshi Nozaki
Keyword(s):  
Molecular Dynamics ◽  
Single Crystals ◽  
Partial Dislocation ◽  
Stacking Fault ◽  
Shockley Partial Dislocation ◽  
Shockley Partial ◽  
Small Crystals ◽  
The Creation ◽  
Copper Single Crystals ◽  
Edge Dislocations

ABSTRACTDislocations were created near the center of the surface (110) of copper small crystals whose surfaces are (111), (111), (110), (110), (112), and (112) by use of n-body atom potentials and molecular dynamics. At first, a Heidenreich-Shockley partial dislocation was created. As the partial dislocation proceeds, the partial dislocation and the surface was connected with a stacking fault until the next Heidenreich-Shockley partial dislocation was created at the surface.Just before the creation of a partial dislocation the stress was the highest. For larger crystals, forming a step on (110) plane was not enough and a shear was necessary to move dislocations.

Computer Simulation of Creation of Dislocations in Copper Small Crystals

1993 ◽  
Vol 319 ◽  
Author(s):  
H. Tanaka ◽  
Masao Doyama
Keyword(s):  
Molecular Dynamics ◽  
Computer Simulation ◽  
Partial Dislocation ◽  
Stacking Fault ◽  
Shockley Partial Dislocation ◽  
Shockley Partial ◽  
Small Crystals ◽  
The Creation

AbstractDislocations were created near the center of the surface (101) of copper small crystals whose surfaces are (111), (111), (101), (101), (121), and (121) by use of n-body atom potentials and molecular dynamics. At first, a Heidenreich-Shockley partial dislocation was created., As the partial dislocation proceeds, the partial dislocation and the surface was connected with a stacking fault until the next Heidenreich-Shockley partial dislocation was created at the surface.Just before the creation of a partial dislocation the stress was the highest.

Computer Simulation of Creation of Dislocations in Copper Small Crystals

1993 ◽  
Vol 319 ◽  
Author(s):  
H. Tanaka ◽  
Masao Doyama
Keyword(s):  
Molecular Dynamics ◽  
Computer Simulation ◽  
Partial Dislocation ◽  
Stacking Fault ◽  
Shockley Partial Dislocation ◽  
Shockley Partial ◽  
Small Crystals ◽  
The Creation

AbstractDislocations were created near the center of the surface (101) of copper small crystals whose surfaces are (111), (111), (101), (101), (121), and (121) by use of n-body atom potentials and molecular dynamics. At first, a Heidenreich-Shockley partial dislocation was created., As the partial dislocation proceeds, the partial dislocation and the surface was connected with a stacking fault until the next Heidenreich-Shockley partial dislocation was created at the surface.Just before the creation of a partial dislocation the stress was the highest.

scholarly journals Shrinking stacking fault through glide of the Shockley partial dislocation in hard-sphere crystal under gravity

2007 ◽  
Vol 105 (10) ◽  
pp. 1377-1383 ◽  
Author(s):  
Atsushi Mori ◽  
Yoshihisa Suzuki ◽  
Shin-Ichiro Yanagiya ◽  
Tsutomu Sawada ◽  
Kensaku Ito
Keyword(s):  
Hard Sphere ◽  
Partial Dislocation ◽  
Stacking Fault ◽  
Shockley Partial Dislocation ◽  
Shockley Partial

TENSILE DEFORMATION OF COPPER SINGLE CRYSTALS BY SIMULATION USING X-RAY LANG METHOD AND MOLECULAR DYNAMICS

2002 ◽  
Vol 16 (28n29) ◽  
pp. 4431-4435
Author(s):  
MASAO DOYAMA ◽  
Y. KOGURE ◽  
T. NOZAKI ◽  
Y. KATO
Keyword(s):  
Molecular Dynamics ◽  
Single Crystal ◽  
Single Crystals ◽  
Tensile Deformation ◽  
Rectangular Parallelepiped ◽  
X Ray ◽  
Partial Dislocations ◽  
The Creation ◽  
Copper Single Crystals

Simulations were performed to model the response of a copper rectangular parallelepiped single crystal with a notch to tensile deformation. Partial dislocations were created near the tip of the notch as we expected. It is hard to see where the dislocations were created by just looking at the displaced positions of atoms, but the creation of dislocations was easily observed by a simulation of X-ray Lang method. Before creation of dislocations, some indication was quite clearly shown. Laue patterns during tensile deformation were also simulated.

Creation of Dislocations in a Shall Copper Single Crystal

1992 ◽  
Vol 278 ◽  
Author(s):  
Masao Doyama
Keyword(s):  
Single Crystal ◽  
Yield Stress ◽  
Partial Dislocation ◽  
Stacking Fault ◽  
Copper Single Crystal ◽  
Shockley Partial ◽  
Partial Dislocations ◽  
Edge Dislocations

AbstractEdge dislocations were created on a surface of a small copper single crystal. Very sharp yield stress was observed when a partial dislocation was created. Edge dislocations in copper were split into Heidenreich–Shockley partial dislocations connected with the stacking fault.

Computer Simulation of Creation and Motion of Edge Dislocations in Face Centered Crystals

1994 ◽  
Vol 356 ◽  
Author(s):  
N. Tajima ◽  
T. Nozaki ◽  
T. Hirade ◽  
Y. Kogure ◽  
Masao Doyama
Keyword(s):  
Molecular Dynamics ◽  
Computer Simulation ◽  
Edge Dislocation ◽  
Embedded Atom ◽  
Small Crystals ◽  
Face Centered ◽  
Edge Dislocations

AbstractComplete and dissociated edge dislocations were created near the center of the surface (101) of aluminum small crystals whose surfaces are (111), (111), (101), (101). (121) and (121). Molecular dynamics with N-body embedded atom potentials were used. Higher stress is needed to create a complete edge dislocation than to create a dissociated dislocation.

Shockley Partial Dislocation-Induced Self-Rectified 1D Hydrogen Evolution Photocatalyst

2019 ◽  
Vol 11 (22) ◽  
pp. 20521-20527 ◽  
Author(s):  
Zhonghui Han ◽  
Weizhao Hong ◽  
Weinan Xing ◽  
Yidong Hu ◽  
Yansong Zhou ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Partial Dislocation ◽  
Shockley Partial Dislocation ◽  
Shockley Partial

Observation of dislocation reactions in CDTE at lattice resolution

1983 ◽  
Vol 41 ◽  
pp. 112-113
Author(s):  
T. Yamashita ◽  
R. Sinclair
Keyword(s):  
Partial Dislocation ◽  
Video Recording ◽  
Dislocation Motion ◽  
Video Tape ◽  
Exposure Rate ◽  
Shockley Partial Dislocation ◽  
Shockley Partial ◽  
Partial Dislocations ◽  
Lattice Resolution ◽  
Obvious Extension

Recently, lattice resolution video-recording of dislocation motion in CdTe has been reported by Sinclair et al, using the Cambridge 500 keV microscope equipped with a TV camera. Phenomena such as the motion of Shockley partial dislocations and climb of Frank dislocations were recorded onto a video tape which has an exposure rate of 50 half-frames per second. An obvious extension of this work is to study the dislocation reactions. An example of such a reaction which was detected in CdTe is shown in Fig. 1. The micrographs were taken several seconds apart in a JEOL 200CX microscope, and they show dissociation of a Frank dislocation into a Shockley partial dislocation and a Lomer dislocation (ie., a sessile lock).

THE PLASTIC DEFORMATION OF THIN COPPER SINGLE CRYSTALS: II. AN ELECTRON MICROSCOPE STUDY OF THE SURFACE STRUCTURE

1967 ◽  
Vol 45 (2) ◽  
pp. 777-786 ◽  
Author(s):  
J. T. Fourie
Keyword(s):  
Single Crystals ◽  
Path Length ◽  
Electron Microscope Study ◽  
Stress Gradient ◽  
Thin Layers ◽  
Bulk Deformation ◽  
Glide Path ◽  
Significant Difference ◽  
Copper Single Crystals ◽  
Edge Dislocations

A comparison is made between the slip-line structure of two copper single crystals, where the glide path length of edge dislocations is 1.44 mm and 0.066 mm, respectively. No significant difference is found. This leads to the conclusion that dislocations that escape at the surface of a crystal are generated very close to it.Stress–strain experiments on thin layers of crystal from the surface and from the center of previously deformed crystals confirm that slip lines are not representative of the bulk deformation. They also show that a flow-stress gradient exists between the surface and the center of the crystal. It is argued that the existence of such a gradient can be used to explain the dependence of the extent of stage I on the glide path length of edge dislocations.

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