Estimation of dislocations density and distribution of dislocations during ECAP-Conform process

2018 ◽  
Author(s):  
Jaber Fakhimi Derakhshan ◽  
Mohammad Habibi Parsa ◽  
Vahid Ayati ◽  
Hamidreza Jafarian
Keyword(s):  
Dislocations Density ◽  
Conform Process ◽  
Distribution Of Dislocations

Anisotropic distribution of dislocations density in tensile strained GaP/GaAs epilayers

Vacuum ◽  
2018 ◽  
Vol 154 ◽  
pp. 214-217 ◽  
Author(s):  
Ravi Kumar ◽  
V.K. Dixit ◽  
T.K. Sharma
Keyword(s):  
Dislocations Density ◽  
Distribution Of Dislocations

Some aspects of the defect structure in an austenitic stainless steel

1978 ◽  
Vol 36 (1) ◽  
pp. 314-315
Author(s):  
R. Gonzalez ◽  
L. Bru
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cellular Structures ◽  
Total Strain Amplitude ◽  
Total Deformation ◽  
Density Of Dislocations ◽  
Planar Arrays ◽  
Stacking Fault Tetrahedra ◽  
Distribution Of Dislocations ◽  
Very High

The analysis of stacking fault tetrahedra (SFT) in fatigued metals (1,2) is somewhat complicated, due partly to their relatively low density, but principally to the presence of a very high density of dislocations which hides them. In order to overcome this second difficulty, we have used in this work an austenitic stainless steel that deforms in a planar mode and, as expected, examination of the substructure revealed planar arrays of dislocation dipoles rather than the cellular structures which appear both in single and polycrystals of cyclically deformed copper and silver. This more uniform distribution of dislocations allows a better identification of the SFT.The samples were fatigue deformed at the constant total strain amplitude Δε = 0.025 for 5 cycles at three temperatures: 85, 293 and 773 K. One of the samples was tensile strained with a total deformation of 3.5%.

Residual stress and dislocations density in silicon ribbons grown via optical zone melting

2013 ◽  
Vol 113 (8) ◽  
pp. 083510 ◽  
Author(s):  
A. Augusto ◽  
D. Pera ◽  
H. J. Choi ◽  
P. Bellanger ◽  
M. C. Brito ◽  
...  
Keyword(s):  
Residual Stress ◽  
Zone Melting ◽  
Dislocations Density ◽  
Optical Zone

scholarly journals Influence of the First Preparation Steps on the Properties of GaN Layers Grown on 6H-SiC by MBE

1999 ◽  
Vol 4 (S1) ◽  
pp. 310-315 ◽  
Author(s):  
R. Lantier ◽  
A. Rizzi ◽  
D. Guggi ◽  
H. Lüth ◽  
B. Neubauer ◽  
...  
Keyword(s):  
Substrate Surface ◽  
Free Exciton ◽  
Near Band Edge ◽  
Band Edge Emission ◽  
Edge Emission ◽  
Rocking Curve ◽  
A Value ◽  
Dislocations Density ◽  
Aln Buffer ◽  
Atomically Flat

The Gan heteroepitaxy on 6H-SiC is affected by the bad morphology of the substrate surface. We performed a hydrogen etching at 1550oC on the 6H-SiC(0001) substrates to obtain atomically flat terraces. An improvement of the structural properties of GaN grown by MBE on such substrates after deposition of a LT-AlN buffer layer is observed. A value of less than 220 arcsec of the FWHM of the XRD rocking curve, showing a reduced screw dislocations density, is comparable with the best results reported until now for thick GaN samples. Photoluminescence showed a structured near band edge emission spectrum with evidence of the A, B and C free exciton recombinations.

scholarly journals Super‐Resolution Microscopy Reveals Shape and Distribution of Dislocations in Single‐Crystal Nanocomposites

2019 ◽  
Vol 131 (48) ◽  
pp. 17489-17495
Author(s):  
Johannes Ihli ◽  
David C. Green ◽  
Christophe Lynch ◽  
Mark A. Holden ◽  
Phillip A. Lee ◽  
...  
Keyword(s):  
Single Crystal ◽  
Super Resolution ◽  
Super Resolution Microscopy ◽  
Distribution Of Dislocations

scholarly journals The ’t Hooft–Polyakov monopole in the geometric theory of defects

2020 ◽  
Vol 34 (12) ◽  
pp. 2050126
Author(s):  
M. O. Katanaev
Keyword(s):  
Physical Interpretation ◽  
Continuous Distribution ◽  
Geometric Theory ◽  
Yang Mills ◽  
Monopole Solution ◽  
Distribution Of Dislocations

The ’t Hooft–Polyakov monopole solution in Yang–Mills theory is given new physical interpretation in the geometric theory of defects. It describes solids with continuous distribution of dislocations and disclinations. The corresponding densities of Burgers and Frank vectors are computed. It means that the ’t Hooft–Polyakov monopole can be seen, probably, in solids.

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