From the viewpoint of grain boundary structure a small-angle symmetric tilt boundary can be considered a boundary that is symmetrically mis-oriented by a small angle from a perfect Σ=1 boundary. The misoriention in these boundaries occurs during the re-crystallization period when annealing of the deformed material helps to develop the boundary. The development of the boundary occurs mainly by t...

A dislocation is a crystallographic defect, or irregularity, within a crystal structure. The presence of dislocations strongly influences many of the properties of materials. The theory was originally developed by Vito Volterra in 1905, but the term 'dislocation' was not coined until later by the Professor Sir Frederick Charles Frank of the Physics Department at the University of Bristol. In 19...

Early-stage dislocation structures inside channels of rapid-cooled and tensile-deformed aluminum single crystals were investigated by using the bright field imaging mode in a scanning transmission electron microscope (STEM-BF). Inside channels, arrays prismatic loops originated from dislocations primary slip system, i.e., , mainly formed. Dislocations coplanar systems such as activated owing to...

Explaining the hydrogen effect on dislocation mobility is crucial to revealing mechanisms of hydrogen-related fracture phenomena. According general perspective, reducing speed can give enough time catch up with migration. In this research, we conducted molecular dynamics (MD) simulations investigate impact edge-dislocation motion in ?-iron at various speeds and temperatures. It was discovered t...

Double-rhombic shaped single Shockley stacking faults (1SSFs) were considered to have a converted threading edge dislocation (TED) on the shallower side of initial basal plane segments. However, structural analysis using transmission electron microscopy (TEM) revealed other possible configuration double-rhombic 1SSFs expanded from dislocations (BPDs) which both ends connected with two TEDs.

Local electronic properties of quasi-two-dimensional Pb(111) islands with screw dislocations different types on their surfaces were experimentally studied by means low-temperature scanning tunneling microscopy and spectroscopy in the regime constant current. A comparison topography map, maps current variation differential conductance acquired simultaneously allows one to visualize hidden parts ...

carpal fracture-dislocation is regarded as an unusual orthopedic injury and, thus, orthopedic surgeons are less experienced in dealing with and treating these fractures and dislocations. we report a 20-year-old worker man suffering from an unusual carpal fracture-dislocation. there was trans-scaphoid fracture and lunate dislocation with other carpal proximal bones toward volar of the wrist. two...