Effect of cascade localization induced bias effect and fluctuation of point defect reactions on defect structure evolution near planar sinks

1994 ◽  
Vol 212-215 ◽  
pp. 315-319 ◽  
Author(s):  
T. Yoshiie ◽  
M. Kiritani
Keyword(s):  
Point Defect ◽  
Defect Structure ◽  
Structure Evolution ◽  
Bias Effect ◽  
Defect Reactions

On the interpretation of dislocation-loop growth during in-situ high-voltage Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 532-533
Author(s):  
E. Holzäpfel ◽  
F. Phillipp ◽  
M. Wilkens
Keyword(s):  
Point Defect ◽  
Rate Equations ◽  
Rate Theory ◽  
Dislocation Loops ◽  
High Voltage Electron Microscopy ◽  
Vacancy Migration ◽  
Voltage Electron ◽  
Reaction Rate Theory ◽  
Defect Reactions

During in-situ radiation damage experiments aiming on the investigation of vacancy-migration properties interstitial-type dislocation loops are used as probes monitoring the development of the point defect concentrations. The temperature dependence of the loop-growth rate v is analyzed in terms of reaction-rate theory yielding information on the vacancy migration enthalpy. The relation between v and the point-defect production rate P provides a critical test of such a treatment since it is sensitive to the defect reactions which are dominant. If mutual recombination of vacancies and interstitials is the dominant reaction, vαP0.5 holds. If, however, annihilation of the defects at unsaturable sinks determines the concentrations, a linear relationship vαP is expected.Detailed studies in pure bcc-metals yielded vαPx with 0.7≾×≾1.0 showing that besides recombination of vacancies and interstitials annihilation at sinks plays an important role in the concentration development which has properly to be incorporated into the rate equations.

scholarly journals Observations of defect structure evolution in proton and Ni ion irradiated Ni-Cr binary alloys

2016 ◽  
Vol 479 ◽  
pp. 48-58 ◽  
Author(s):  
Samuel A. Briggs ◽  
Christopher M. Barr ◽  
Janne Pakarinen ◽  
Mahmood Mamivand ◽  
Khalid Hattar ◽  
...  
Keyword(s):  
Defect Structure ◽  
Binary Alloys ◽  
Structure Evolution

Importance of point defect reactions for the atomic-scale roughness of III–V nanowire sidewalls

2019 ◽  
Vol 30 (32) ◽  
pp. 324002
Author(s):  
Adrian Díaz Álvarez ◽  
Nemanja Peric ◽  
Nathali Alexandra Franchina Vergel ◽  
Jean-Philippe Nys ◽  
Maxime Berthe ◽  
...  
Keyword(s):  
Point Defect ◽  
Atomic Scale ◽  
Defect Reactions ◽  
Scale Roughness

Defect reactions and clustering in irradiated solids

1990 ◽  
Vol 68 (9) ◽  
pp. 887-905 ◽  
Author(s):  
L. K. Mansur
Keyword(s):  
Defect Structure ◽  
Materials Science ◽  
Solute Segregation ◽  
High Dose ◽  
Physical Metallurgy ◽  
Solid Materials ◽  
The Past ◽  
Cumulative Processes ◽  
Defect Reactions ◽  
Kinetics Of

Irradiation of solid materials with energetic neutrons or charged particles can lead to profound changes in defect structure, microcomposition, and macroscopic properties. Such changes occur by atomic and microstructural mechanisms, some of which are familiar in "classical" physical metallurgy and materials science. However, other cases appear to be unique to irradiation. Irradiation has considerably broadened and indeed provided an entirely new dimension in materials science, since the energetic displacement of atoms potentially reaches to every property or process. The initial damaging events leading to the creation of point defects are generally complete in times of order 10−11 s. Subsequent changes in structure, composition, and properties take place in a span of much longer time scales corresponding to interstitial and vacancy diffusion, clustering, solute segregation, and precipitation. An extensive theoretical framework has been developed to understand the kinetics of these processes. Emphasis has been placed on both steady cumulative processes and on fluctuations, and on the appropriate application of stochastic and deterministic descriptions. Parallel and interactive experimental activities for both applied and basic programs over the past two decades have increased the level of phenomenological knowledge enormously. Much of the work has emphasized either high-dose phenomena such as irradiation-induced swelling, creep, embrittlement, phase instability, and solute segregation relevant to materials applications, or the properties, structures, and interactions of defects, which underlie more fundamental issues.

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