Kinetics of dimer-adatom–stacking-fault reconstruction on laser-quenched Si(111) surfaces

2000 ◽  
Vol 62 (4) ◽  
pp. 2546-2551 ◽  
Author(s):  
K. Shimada ◽  
T. Ishimaru ◽  
T. Watanabe ◽  
T. Yamawaki ◽  
M. Osuka ◽  
...  
Keyword(s):  
Stacking Fault ◽  
Fault Reconstruction ◽  
Kinetics Of

Kinetics of Deformation Processes in a High-Alloy Cast TWIP Steel Determined by Acoustic Emission and Scanning Electron Microscopy

2013 ◽  
Vol 592-593 ◽  
pp. 489-492
Author(s):  
Anja Weidner ◽  
Alexei Vinogradov ◽  
Alexei Lazarev ◽  
Horst Biermann
Keyword(s):  
Plastic Deformation ◽  
Acoustic Emission ◽  
Twip Steel ◽  
Tensile Deformation ◽  
Stacking Fault ◽  
Trip Effect ◽  
High Alloy ◽  
Deformation Processes ◽  
Kinetics Of ◽  
Alloy Cast

High-alloy cast CrMnNi steels exhibit depending on the chemical composition either transformation induced plasticity (TRIP-effect) or twinning induced plasticity (TWIP effect). Whereas the TRIP effect is caused by a martensitic phase transformation from the f.c.c austenitic phase into the b.c.c α-martensite phase via the formation of deformation bands with high stacking fault density the so-called ε-martensite, the TWIP effect is the result of mechanical twinning during plastic deformation. The occurrence of both effects as well as the underlying microstructural processes are strongly affected by the austenite stability, the stacking fault energy and/or the test temperature. However, the onset stress and the kinetics of these deformation processes are still unknown. The in-situ measurement of acoustic emission signals during the plastic deformation of materials is a powerful tool for the investigation of such dynamic microstructural processes and their kinetics. In the present study acoustic emission measurements were performed during tensile deformation at room temperature on a high-alloy cast TWIP steel. The AE investigations were completed by SEM investigations on the deformed specimens. The statistical and cluster analysis of acoustic emission signals reveals different patterns of acoustic emission signals, which are correlated with underlying microstructural processes.

Kinetics of stacking fault growth

1963 ◽  
Vol 11 (12) ◽  
pp. 1367-1368 ◽  
Author(s):  
J.S. Hirschhoen
Keyword(s):  
Stacking Fault ◽  
Fault Growth ◽  
Kinetics Of

The annealing of faulted loops in magnesium and zinc

1966 ◽  
Vol 292 (1429) ◽  
pp. 240-263 ◽  
Keyword(s):  
Oxide Film ◽  
Metal Surface ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Stacking Sequence ◽  
Nearest Neighbour ◽  
Dislocation Loops ◽  
Factors Influencing ◽  
Thin Foils ◽  
Kinetics Of

It has been shown that dislocation loops can be nucleated and grown in thin foils made from quenched specimens of magnesium and zinc. Observations are presented which indicate that the surfaces of the thin foils are sealed with an oxide film. Freely diffusing vacancies can only escape from the foil where this oxide film has become locally ruptured, exposing the metal surface. The loops are usually faulted, with b = R = 1/6 <2023>. Occasionally unfaulted loops, with b = <0001>, are observed. An analysis of the kinetics of climb of the faulted loops provides estimates of the stacking fault energy (corresponding to a single violation of the next-nearest-neighbour stacking sequence). These values are, for magnesium, 280 ± 100 erg/ cm 2 and, for zinc, 300 ± 150 erg/cm 2 . Factors influencing the climb rate are discussed.

Hall–Petch and grain growth kinetics of the low stacking fault energy TRIP Cr40Co40Ni20 multi-principal element alloy

2021 ◽  
Vol 119 (6) ◽  
pp. 061903
Author(s):  
Gustavo Bertoli ◽  
Lucas B. Otani ◽  
Amy J. Clarke ◽  
Claudio S. Kiminami ◽  
Francisco G. Coury
Keyword(s):  
Grain Growth ◽  
Growth Kinetics ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Principal Element ◽  
Grain Growth Kinetics ◽  
Kinetics Of

scholarly journals X-ray diffuse scattering study of the kinetics of stacking fault growth and annihilation in boron-implanted silicon

2002 ◽  
Vol 81 (17) ◽  
pp. 3167-3169 ◽  
Author(s):  
D. Luebbert ◽  
J. Arthur ◽  
M. Sztucki ◽  
T. H. Metzger ◽  
P. B. Griffin ◽  
...  
Keyword(s):  
Diffuse Scattering ◽  
Stacking Fault ◽  
X Ray ◽  
Scattering Study ◽  
Fault Growth ◽  
Kinetics Of

The formation and growth of vacancy loops in magnesium

1968 ◽  
Vol 307 (1488) ◽  
pp. 71-81 ◽  
Keyword(s):  
Surface Oxidation ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Dislocation Loops ◽  
Temperature Range ◽  
Vacancy Loops ◽  
A Value ◽  
Thin Foils ◽  
Contrast Analysis ◽  
Kinetics Of

Single, double and multi-layered dislocation loops have been observed in thin foils of quenched magnesium, and the structure of the loops established by contrast analysis. On annealing in the temperature range 150 to 200°C the loops are observed to grow as a result of the production of vacancies by surface oxidation of magnesium. The kinetics of loop growth have been analysed and a value of 125 ± 25 erg/cm 2 for the stacking fault energy obtained.The reliability and significance of the value in governing the properties of magnesium is discussed.

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

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