The low-temperature plastic deformation of α-titanium and the core structure of a-type screw dislocations

1988 ◽  
Vol 57 (5) ◽  
pp. 717-740 ◽  
Author(s):  
S. Naka ◽  
A. Lasalmonie ◽  
P. Costa ◽  
L. P. Kubin
Keyword(s):  
Plastic Deformation ◽  
Low Temperature ◽  
Core Structure ◽  
Screw Dislocations ◽  
The Core

scholarly journals Evaluation of Aberration-corrected Optical Sectioning for Exploring the Core Structure of ½[111] Screw Dislocations in BCC Metals

2017 ◽  
Vol 23 (S1) ◽  
pp. 432-433
Author(s):  
D. Hernandez-Maldonado ◽  
R. Groger ◽  
Q. M. Ramasse ◽  
P. B. Hirsch ◽  
P.D. Nellist
Keyword(s):  
Core Structure ◽  
Optical Sectioning ◽  
Screw Dislocations ◽  
The Core ◽  
Bcc Metals ◽  
Aberration Corrected

The core structure of ½(111) screw dislocations in b.c.c. crystals

1970 ◽  
Vol 21 (173) ◽  
pp. 1049-1073 ◽  
Author(s):  
V. Vítek ◽  
R. C. Perrin ◽  
D. K. Bowen
Keyword(s):  
Core Structure ◽  
Screw Dislocations ◽  
The Core

The Core Structure of Dislocations in GaAs

1985 ◽  
Vol 62 ◽  
Author(s):  
B. C. De Cooman ◽  
K.-H. Kuesters ◽  
C. B. Carter
Keyword(s):  
High Stress ◽  
Dislocation Core ◽  
Core Structure ◽  
Screw Dislocations ◽  
The Core ◽  
Resolution Electron ◽  
Model Structures ◽  
High Resolution Electron Micrographs ◽  
Structural Aspects ◽  
Strong Asymmetry

ABSTRACTThe structural aspects of dislocations in GaAs which had been plastically deformed at high stress were studied by TEM. The glide of well-defined dislocations in their slip-plane was observed during the recombination-enchanced relaxation of the dislocations from their high-stress configuration. The strong asymmetry of dislocation velocity previously observed by other techniques is confirmed. High-resolution, electron micrographs of dissociated end-on screw dislocations were compared to computer simulated micrographs of model structures of the dislocation core. No definite conclusion regarding the exact core structure could be made due to the movement of the defects during the observation.

scholarly journals The core structure of screw dislocations with [001] Burgers vector in Mg 2 SiO 4 olivine

2021 ◽  
Vol 22 (S3) ◽  
pp. 1-12
Author(s):  
Srinivasan Mahendran ◽  
Philippe Carrez ◽  
Patrick Cordier
Keyword(s):  
Core Structure ◽  
Screw Dislocations ◽  
Burgers Vector ◽  
The Core

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

In situ Tensile Experiments at Low Temperatures on Niobium Single Crystals by H.V.E.M.

1975 ◽  
Vol 33 ◽  
pp. 58-59
Author(s):  
F. H. Louchet ◽  
L. P. Kubin
Keyword(s):  
Electron Microscope ◽  
Transition Temperature ◽  
Low Temperature ◽  
Slip System ◽  
Low Temperatures ◽  
Tensile Axis ◽  
Image Intensifier ◽  
Screw Dislocations ◽  
Source Operation

Experiments have been carried out on the 3 MeV electron microscope in Toulouse. The low temperature straining holder has been previously described Images given by an image intensifier are recorded on magnetic tape.The microtensile niobium samples are cut in a plane with the two operative slip directions [111] and lying in the foil plane. The tensile axis is near [011].Our results concern:- The transition temperature of niobium near 220 K: at this temperature and below an increasing difference appears between the mobilities of the screw and edge portions of dislocations loops. Source operation and interactions between screw dislocations of different slip system have been recorded.

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