Even for metals of the same crystal structure there is a very wide variation. These differences must be reflected in the movement and arrangement of the dislocations. The distribution and motion of the dislocations have now been studied by the transmission electron microscope technigue ( 1 , 2 ...
Loops containing more than about 30 vacancies in Fe are found to produce atomic displacements during annealing, due to thermally activated movement in the direction of their Burgers vector that is qualitatively similar to the mechanism of SIA cluster motion. Although vacancy clusters are slightly less...
Metals with nanoscale twins have shown ultrahigh strength and excellent ductility, attributed to the role of twin boundaries (TBs) as strong barriers for the motion of lattice dislocations. Though observed in both experiments and simulations, the barrier effect of TBs is rarely studied quantitatively....
Victoria, in Materials Today, 2008 However the phenomena determining dislocation movement are often very different in bcc metals. In bcc metals, screw dislocations control the plastic deformation process. Furthermore slip in the bcc crystal can be non-planar or on a high-index plane. As the ...
Observation of dislocation movement and interaction in zirconium by transmission electron microscopymetals, ceramics, and other materialsannealingconfigurationdefectsdislocationselectron microscopyfoilsinteractionszirconiumObservations on annealed zirconium foils by transmission electron microscopy reveal that dislocations ...
boundary movement is temperature-dependent. A computer method has been developed to simulate a step with dislocation character in a boundary with full periodicity in the boundary plane, i.e. along both the direction of the line of the defect and its direction of motion. It may be used to in...
Dislocation motion, an important mechanism underlying crystal plasticity, is critical for the hardening, processing and application of a wide range of structural and functional materials. For decades, the movement of dislocations has been widely observed
XI. Dislocation energies and choice of slip plane in face-centred cubic metals 来自 Taylor & Francis 喜欢 0 阅读量: 32 作者:Foreman, A.J.E.,Lomer, W.M.摘要: The release of stored energy is due to the movement and elimination of lattice defects. A theory is presented of the factors ...
Dislocation cross-slip in GaN single crystals under nanoindentation The dislocation multiplication and movement mechanism in GaN single crystals has been studied using nanoindentation and cathodoluminescence. Dislocation lo... J Huang,K Xu,XJ Gong,... - 《Applied Physics Letters》 被引量: 37发表: 20...
Fig. 36.Movement of a superdislocation at elevated temperatures (fromFlinn[1960]).Copyright ©1960 View chapterExplore book Collective behavior and superdislocation motion in L12 alloys D.C.Chrzan,M.J.Mills, inFundamental Aspects of Dislocation Interactions, 1993 ...