Intersection of dislocations with disclinations and flow stress in metallic glasses
作者:
M.Yu Gutkin,
I.A. Ovid'ko,
A.E. Romanov,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1994)
卷期:
Volume 129,
issue 3-4
页码: 239-255
ISSN:1042-0150
年代: 1994
DOI:10.1080/10420159408229023
出版商: Taylor & Francis Group
关键词: intersection of defects;edge dislocation;wedge disclination;disclination quadrupole;flow stress;metallic glasses
数据来源: Taylor
摘要:
Intersection of a moving edge dislocation with disclination configurations, an isolated wedge disclination and a quadrupole of wedge disclinations, is theoretically examined in detail. It is shown that, after a moving disclocation intersects with a disclination configuration, the force occurs which hampers the dislocation motion. By methods of the elasticity theory the exact formulae are found for the forces,F1andF2, which hamper a moving dislocation intersected with an isolated disclination and a disclination quadrupole, respectively. With the help of these formulae the flow stress of metallic glasses in an inhomogeneous deformation regime as well as the energy of elastic short-range distortions in metallic glasses are estimated within the framework of the model in which basic elements of disclination ensemble in metallic glass are isolated disclinations and disclination quadrupoles.
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