A simple criterion is developed that involves a dimensionless parameter β = (ƒ− γ)μb, where ƒ and γ are the surface stress and surface tension of the unreconstructed surface, μ is the shear modulus, and b is the magnitude of the Burgers vector. The model predicts that when ...
The source strength τFR is shown to be inversely proportional to the Frank-Read source segment length (Brown, 1964, Shishvan and Van der Giessen, 2010):(11)τFR=βμBlFRwhere lFR is the segment's length, μ the shear modulus, B the magnitude of the Burgers vector and β a material...
Crystal plasticity is characterized by the onset of intermittent dislocation glide events or avalanches, which lead to prominent strain burst emissions when the sample size is reduced to a few micrometers. The emission probability,P, of a dislocation burst of sizesis ascribed to the power-law rela...
The arrows indicate the magnitude and direction of the disregistry. The bold-dashed lines in the color of dark brown, blue, and brown denote the resultant interface dislocations with Burgers vector b1, b3, and b2, respectively. Stacking fault regions are highlighted in yellow shadow and normal ...
the saturation dislocation density rho is found to be determined by rho=lambdaepsiv/(bv c), where lambda is a constant that depends on the material properties, epsiv is the strain rate, b is the magnitude of Burgers vector and v c is the dislocation climb velocity along the dislocation line...
Dislocation loops with Burgers vector a¨100 are formed in Cu-Ni alloys during 1 MeV electron irradiation in a high-voltage electron microscope at 350°-400°C. The dislocation loops are of interstitial type and pure edge in character with ¨110 line vectors. Some of the loops are seen to...
A disconnection adds an additional barrier because of a residual dislocation with a Burgers vector magnitude equal to the difference between b Cu and b Ni. This barrier depends on the position of the disconnection relative to the glide plane of the transecting glide dislocation and on the ...
Local Nye Tensors (LNT) for each active CSS are dyadic products of their Burgers vector and a Dislocation Density Vector (DDV) describing the GND population. This vector, lying in the slip plane, has a magnitude equal to that of the local GND, and a direction given by the character of ...
of GBs is inherently multiscale; the GB structure evolution requires explicit atomistic treatment, whereas the dislocation pile-up itself has long-range character.25 In this spirit, multiscale in slip-CTB interaction is proportional to the magnitude of the Burgers vector of the residual dislocation,...
The model is based upon a combination of basic dislocation physics, the distribution of dislocation segment lengths in cell walls and percolation theory. With only the magnitude of the Burgers vector and the elastic shear modulus as inputs, and with no adjustable parameters, the model correctly ...