Monte Carlo Modelling of Recrystallization Mechanisms in Wire-Drawn Copper from EBSD Data

2004 ◽  
Vol 467-470 ◽  
pp. 635-640 ◽  
Author(s):  
Ph. Gerber ◽  
Jacek Tarasiuk ◽  
Denis Solas ◽  
S. Jakani ◽  
Marie Helene Mathon ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Recrystallization Process ◽  
Stored Energy ◽  
Ebsd Data ◽  
Electron Back Scattered Diffraction ◽  
Local Misorientation ◽  
Scanning Electron

In order to simulate the recrystallization process, Monte Carlo modelling has been applied to the case of wire-drawn copper deformed to a moderate strain. The complete experimental set of data was taken mainly from Electron Back Scattered Diffraction measurements in a Scanning Electron Microscope. Several nucleation hypothesis have been introduced and tested into the model. It has been shown that nucleation taking into account the sites associated with the highest stored energy and highest local misorientation leads to the best results in terms of recrystallization microstructure and texture. An important number of new orientations - that come only from annealing twinning - are not reproduced with the model, indicating the major role of this particular mechanism during the recrystallization process.

scholarly journals The Carotid Siphon: A Scanning Electron Microscope Assessment of its Embolie Potential

1985 ◽  
Vol 12 (3) ◽  
pp. 263-266 ◽  
Author(s):  
F.W. Saunders ◽  
P. Shedden
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Clinical Studies ◽  
Carotid Bifurcation ◽  
Scanning Electron Microscope Study ◽  
Embolic Material ◽  
Carotid Siphon ◽  
Morphologic Data ◽  
Scanning Electron

ABSTRACT:The role of the carotid siphon as a source of embolic material has had limited morphological or clinical study. The morphologic data available suggests that the siphon plays only a small role in embolic cerebrovascular disease. Clinical studies, however, suggest that it has a significant ischemic potential. To clarify this apparent discrepancy, we have designed a scanning electron microscope study of the carotid siphon. Eighty percent of the specimens from the carotid bifurcation and 30% of the siphon specimens showed evidence of damaged endothelium with attached red cell and platelet debris. The embolic potential of the siphon is estimated to be between ⅓ to ½ that of the carotid bifurcation. This supports the most recent clinical studies.

scholarly journals Inter- and Intragranular Stress Determination with Kossel Microdiffraction in a Scanning Electron Microscope

2006 ◽  
Vol 524-525 ◽  
pp. 109-114 ◽  
Author(s):  
Raphaël Pesci ◽  
Karim Inal ◽  
Sophie Berveiller ◽  
Etienne Patoor ◽  
Jean Sébastien Lecomte ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ccd Camera ◽  
Stress Sensitivity ◽  
In Situ Tests ◽  
Set Up ◽  
Line Patterns ◽  
Electron Back Scattered Diffraction ◽  
Scanning Electron

A Kossel microdiffraction experimental set up is under development inside a Scanning Electron Microscope (SEM) in order to determine the crystallographic orientation as well as the inter- and intragranular strains and stresses on the micron scale, using a one cubic micrometer spot. The experimental Kossel line patterns are obtained by way of a CCD camera and are then fully indexed using a home-made simulation program. The so-determined orientation is compared with Electron Back-Scattered Diffraction (EBSD) results, and in-situ tests are performed inside the SEM using a tensile/compressive machine. The aim is to verify a 50MPa stress sensitivity for this technique and to take advantage from this microscope environment to associate microstructure observations (slip lines, particle decohesion, crack initiation) with determined stress analyses.

Monte Carlo Modelling of Recrystallization Process in Cold Rolled IF-Ti Steel

2004 ◽  
Vol 467-470 ◽  
pp. 665-670
Author(s):  
Amel Samet-Meziou ◽  
Ph. Gerber ◽  
Jacek Tarasiuk ◽  
Thierry Baudin ◽  
Richard Penelle
Keyword(s):  
Monte Carlo ◽  
Texture Evolution ◽  
Recrystallization Process ◽  
Stored Energy ◽  
Nucleation Mechanisms ◽  
Deformation Amount ◽  
Complete Set ◽  
High Reduction ◽  
Cold Rolled ◽  
Electron Back Scattered Diffraction

Recently, some authors have used the Monte Carlo modelling using complete set of experimental data to get a better correlation between experimental observations and calculations concerning recrystallization process [1, 2]. Simulations using Monte Carlo technique have been performed these last years for IF-Ti steels in order to predict the microstructure and the texture evolution after high reduction amounts by cold rolling [3, 4]. On the contrary, in the present work, this evolution is simulated in an IF-Ti steel cold rolled after low deformation amount (reduction amount R = 40 %). Microstructure is characterized by Electron Back-Scattered Diffraction and introduced in the model. The quality index of the Kikuchi patterns (EBSD data) is used to qualitatively evaluate the stored energy for each grain. Different hypothesis of nucleation mechanisms have been introduced into the model. It has been shown that the better recrystallization texture correlation between experiment and simulation is obtained by taking into account the nucleation in the low stored energy sites and highly misorientation regions. Finally a simulation issue was compared with EBSD and TEM experimental results: microstructure, recrystallization kinetics and Avrami coefficients values.

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