In Situ Observations and Measurements of Mechanically Induced Grain Boundary Migration in a Scanning Electron Microscope

2012 ◽  
Vol 715-716 ◽  
pp. 819-824 ◽  
Author(s):  
Tatiana Gorkaya ◽  
Thomas Burlet ◽  
Dmitri A. Molodov ◽  
Günter Gottstein
Keyword(s):  
Shear Stress ◽  
Grain Boundary ◽  
Elevated Temperatures ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Orientation Contrast ◽  
In Situ Observations ◽  
Set Up ◽  
Scanning Electron

A novel set-up developed to continuously observe and measure stress driven grain boundary migration is presented. A commercially available tensile/compression SEM unit was utilized for in-situ observations of mechanically loaded samples at elevated temperatures up to 850°C by recording orientation contrast images of bicrystal surfaces. Two sample holders for application of a shear stress to the boundary in bicrystals of different geometry were designed and fabricated. The results of first measurements are presented.

Anisotropy of Grain Boundary Migration Observed in Situ by Synchrotron Radiation

2004 ◽  
Vol 467-470 ◽  
pp. 911-916 ◽  
Author(s):  
Václav Paidar ◽  
Pavel Lejček ◽  
M. Polcarová ◽  
J. Brádler ◽  
Alain Jacques
Keyword(s):  
Synchrotron Radiation ◽  
Grain Boundary ◽  
Moving Boundary ◽  
Elevated Temperatures ◽  
Rotation Axis ◽  
Boundary Migration ◽  
Crystal Defects ◽  
Grain Boundary Migration ◽  
Grain Boundary Motion

Grain boundary motion was studied in situ at elevated temperatures by x-ray topography using synchrotron radiation. In addition to the position of grain boundary, other crystal defects that may interact with the moving boundary were observed simultaneously. Two types of bicrystals with the [001] rotation axis were selected for the experiments, the first one with a high coincidence S5 misorientation of about 37° and the other one with no coincidence of two crystals for the misorientation of 45°. The geometrical differences between chosen bicrystals are examined and attention is also paid to faceting – local orientations of the boundary plane.

In-Situ Observations of Grain Boundary Migration

1996 ◽  
Vol 204-206 ◽  
pp. 99-108 ◽  
Author(s):  
Günter Gottstein ◽  
U. Czubayko ◽  
Dmitri A. Molodov ◽  
Lasar S. Shvindlerman ◽  
Wilfried Wunderlich
Keyword(s):  
Grain Boundary ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
In Situ Observations

Mechanisms of New Orientation Formation during Recrystallization of Old Deformed Aluminium Bicrystals

2005 ◽  
Vol 495-497 ◽  
pp. 1249-1254 ◽  
Author(s):  
Henryk Paul ◽  
Julian H. Driver ◽  
Arnaud Lens
Keyword(s):  
Grain Boundary ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Pure Aluminium ◽  
Local Orientation ◽  
Sample Heating ◽  
Orientation Mapping ◽  
Grain Orientations ◽  
Slip Planes

The crystallography of recrystallization nucleation has been investigated in channel-die deformed pure aluminium bicrystals with {100}<011>/{110}<001> and {100}<001>/{110}<001> orientations. The new grain orientations and misorientations were followed by systematic local orientation measurements using SEM and semi-automatic measurements in a TEM. In particular, orientation mapping combined with in-situ sample heating was used to investigate the formation and growth of new grains and their crystallographic orientation changes at very early stages of recrystallization. Grain boundary migration and ‘consumption’ of the as-deformed areas was always favoured along directions parallel to the traces of the {111} slip planes that had been most active during deformation. The orientations of the first formed nuclei were misoriented with respect to the orientations identified within the neighbouring deformed areas by α(<111>, <112>, or <100>)relations.

scholarly journals In Situ Hvem Study of Ion Irradiation-Induced Grain Growth in Au Thin Films

1988 ◽  
Vol 128 ◽  
Author(s):  
Joyce C. Liu ◽  
Jian Li ◽  
J. W. Mayer ◽  
Charles W. Allen ◽  
Lynn E. Rehn
Keyword(s):  
Grain Growth ◽  
Room Temperature ◽  
Ion Irradiation ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Average Grain Size ◽  
In Situ Observations ◽  
Au Thin Films ◽  
Grain Coalescence

ABSTRACTIn situ observations of 1.5 MeV Xe+ ion irradiated Au films at room temperature and at 150°C reveal the evolution of grain growth: the average grain size increases by the mechanisms of grain boundary migration and grain coalescence.

In situ atomistic observation of grain boundary migration subjected to defect interaction

2020 ◽  
Vol 199 ◽  
pp. 42-52 ◽  
Author(s):  
Q. Zhu ◽  
S.C. Zhao ◽  
C. Deng ◽  
X.H. An ◽  
K.X. Song ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Defect Interaction

Creep in Polycrystalline Aluminum

1999 ◽  
Vol 586 ◽  
Author(s):  
C. L. Briant ◽  
D. L. Davidson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Grain Boundary ◽  
Triple Point ◽  
Tensile Strain ◽  
Boundary Migration ◽  
Local Strain ◽  
Grain Boundary Migration ◽  
Polycrystalline Aluminum ◽  
Scanning Electron

ABSTRACTThis paper presents a study of creep in polycrystalline aluminum. The sample was deformed in a scanning electron microscope and local strain was measured by analyzing micrographs taken during the test. EBSP was used to examine grain curvature and recrystallization The results showed that tensile strain developed during the test. The strain was not constant but varied both spatially and with time. Significant grain boundary migration occurred during the test, and near a triple point a grain with a completely new orientation was formed.

scholarly journals In-Situ Observation of Grain-Boundary Migration in Fe-3wt%Si Bicrystals by Synchrotron X-Radiation Topography

1996 ◽  
Vol 82 (6) ◽  
pp. 471-474 ◽  
Author(s):  
Katsushi ICHIKAWA ◽  
Toshiyuki UEDA ◽  
Sadahiro TSUREKAWA ◽  
Yasunari YOSHITOMI ◽  
Yukio MATSUO ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Migration ◽  
In Situ Observation ◽  
Grain Boundary Migration
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