Observation of intrinsic and extrinsic secondary grain boundary dislocations in [001] high angle twist boundaries in MgO
نویسندگان
چکیده
منابع مشابه
Investigation of Extrinsic Grain Boundary Dislocations in Copper
The extrinsic grain boundary dislocations (EGBD's) in copper have been studied by transmission electron microscopy. It was shown that some EGBD's remain on grain boundaries after recrystallization and annealing at 0.6 T,, but not on those annealed at 0.8 T,. For several grain boundaries the crystallography of the defects was examined in detail and the dynamic theory of diffraction was used for ...
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We investigated the migration of a symmetric tilt, low-angle grain boundary (LAGB) under applied shear stress in the presence of extrinsic dislocations. The results demonstrate that there is a threshold stress for the LAGB to depin from extrinsic dislocations. Below the threshold stress, the LAGB remains immobile at zero dislocation climb mobility, while for finite climb mobilities, it migrates...
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Large twist-angle grain boundaries in layered structures are often described by Scherk’s first surface whereas small twist-angle grain boundaries are usually described in terms of an array of screw dislocations. We show that there is no essential distinction between these two descriptions and that, in particular, their comparative energetics depends crucially on the core structure of their scre...
متن کاملOn the small angle twist sub-grain boundaries in Ti3AlC2
Tilt-dominated grain boundaries have been investigated in depth in the deformation of MAX phases. In stark contrast, another important type of grain boundaries, twist grain boundaries, have long been overlooked. Here, we report on the observation of small angle twist sub-grain boundaries in a typical MAX phase Ti3AlC2 compressed at 1200 °C, which comprise hexagonal screw dislocation networks fo...
متن کاملMOLECULAR DYNAMICS APPROACH OF THE [001] TWIST GRAIN BOUNDARIES ENERGY IN Cu
Using the Molecular Dynamics technique the energy E vs the misorientation 9 has been calculated for the CSL [OOl] twist grain boundaries in Cu. Two potentials have been used; the Morse potential and a spline potential constructed by Englert and Tompa for Cu. In each case the low and high angle grain boundary regions have been clearly distinguished by using the relation E= Eo9(A-he), valid for l...
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ژورنال
عنوان ژورنال: Scripta Metallurgica
سال: 1979
ISSN: 0036-9748
DOI: 10.1016/0036-9748(79)90152-2