Dislocation
Inertia of Dislocation Motion and Negative Mechanical Response in Crystals
Dear Colleagues,
Please see attached a recent article published in Scientific Reports on the fundamental nature of dislocation motion in crystals. Leave your comments or whatever you think of it.
Link: https://www.nature.com/articles/s41598-017-18254-5
Best,
Yizhe
Is it safe to assume that the change in a dislocations' burger's vector size is negligible during loading?
Forums
Free Tags
As a result of loading, there is grain distortion, which results in lattice distortion. when lattice distortion happens, then lattice parameter changes. The change in lattice parameter, (a), results in a dislocation's burger's vector size change, since it has the lattice parameter size in its formula. Consequently, one can conclude that the size of burger's vector of a dislocation changes as a result of loading! . Still, is it practically safe to assume that the the change in its size is negligible compared to its initial size before loading?
Is there a way to measure the magnitude of a dislocation burger's vector via high precision optical microscopes?
Forums
Free Tags
I need to calculate the size or magnitude of the burger's vector of a dislocation in crystalline materials, metals. Obviously and typically, it can be measured via XRD or the electron microscopy methods, TEM and SEM. The question is:
could it also be measured via high precision optical microscopes, as precise as 1nm ?
Competing mechanisms between dislocation and phase transformation in plastic deformation of single crystalline yttria-stabilized tetragonal zirconia nanopillars
Molecular dynamics (MD) is employed to investigate the plastic deformation mechanisms of single crystalline yttria-stabilized tetragonal zirconia (YSTZ) nanopillars under uniaxial compression. Simulation results show that the nanoscale plastic deformation of YSTZ is strongly dependent on the crystallographic orientation of zirconia nanopillars. For the first time, the experimental explored tetragonal to monoclinic phase transformation is reproduced by MD simulations in some particular loading directions.
A critical thickness condition for graphene and other 2D materials
B. C. McGuigan, P. Pochet, and H. T. Johnson, Critical thickness for interface misfit dislocation formation in two-dimensional materials, Phys. Rev. B 93, 214103, 2016.