Determining local geometrical features of grain boundaries from microscopy

General Geometrical Models of Grain Boundaries

Geonetric models of grain boundaries have been extensively studied following Bollmann's original ideas. 1hese models apply only for symmorphic structures with one atom per primitive unit cell. These restrictions may be easily avoided by introducing some elementary concepts of crystallography which lead to an unified description of homophase interfaces. Ihe notion of symmetry dictated extrema is...

Geometrical speciality and special properties of grain boundaries

2014 It has long been a major preoccupation of materials users, whether implied or explicit, to tailor microstructures in order to adapt specific properties for a given application. In this context, the principal aim of the present review article is to consider the fundamental elements of polycrystal microstructures, i.e. the grain boundaries. The paper discusses current understanding of two im...

Local Melting Attracts Grain Boundaries in Colloidal Polycrystals.

We find that laser-induced local melting attracts and deforms grain boundaries in 2D colloidal crystals. When a melted region in contact with the edge of a crystal grain recrystallizes, it deforms the grain boundary-this attraction is driven by the multiplicity of deformed grain boundary configurations. Furthermore, the attraction provides a method to fabricate artificial colloidal crystal grai...

Determining Motion Boundaries From Image Boundaries Using Deep Descriptor Matching

Transmission electron microscopy/electron energy loss spectroscopy measurements and ab initio calculation of local magnetic moments at nickel grain boundaries

We have determined local magnetic moments at nickel grain boundaries using a transmission electron microscopy/electron energy loss spectroscopy method assuming that the magnetic moment of Ni atoms is a linear function of the L3/L2 (white-line ratio) in the energy loss spectrum. The average magnetic moment measured in the grain interior was 0.55 μB, which agrees well with the calculated magnetic...