Directional and single-crystal solidification of Ni-base superalloys: Part II. Coincidence site lattice character of grain boundaries

2000 ◽  
Vol 31 (11) ◽  
pp. 2887-2893 ◽  
Author(s):  
M. G. Ardakani ◽  
N. D’Souza ◽  
B. A. Shollock ◽  
M. McLean
Keyword(s):  
Single Crystal ◽  
Grain Boundaries ◽  
Coincidence Site Lattice ◽  
Site Lattice

The Morphology of Grain Boundary Interactions with Twins in YBa2Cu3O7−δ

1993 ◽  
Vol 319 ◽  
Author(s):  
Jenn-Yue Wang ◽  
A. H. King
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Twin Boundary ◽  
Interfacial Energy ◽  
Coincidence Site Lattice ◽  
The Other ◽  
Twin Boundaries ◽  
Site Lattice ◽  
Dislocation Arrays

AbstractVarious morphologies are observed where twins meet grain boundaries in YBa2Cu3O7−δ. Twins may be “correlated” at the boundary (i.e. twin boundaries from one grain may meet a twin boundary from the other grain in a quadruple junction) and the twins may be narrowed or “constricted” at the boundary. These effects are determined by the interfacial energy. We estimate the energy of the various interfaces by determining the dislocation arrays they contain, using the constrained coincidence site lattice (CCSL) model and Bollmann's O2-lattice formalism. Our approach indicates that there are significant changes in the energy of the interfaces and is thus able to explain the variety of observed morphologies.

Toward Realizing the Structure-Property Link in Polycrystalline Thin Films

1994 ◽  
Vol 343 ◽  
Author(s):  
C. S. Nichols
Keyword(s):  
Thin Films ◽  
Grain Boundaries ◽  
Coincidence Site Lattice ◽  
Polycrystalline Materials ◽  
Structure Property ◽  
New Approach ◽  
Site Lattice ◽  
Polycrystalline Thin Films ◽  
Structures And Properties ◽  
Polycrystalline Form

ABSTRACTMany materials for engineering applications are used in polycrystalline form and contain grain boundaries with a range of structures and properties. However, most research on grain boundaries to date has focussed exclusively on symmetric coincidence site lattice interfaces. To go beyond descriptions for these simple interfaces and thence to an aggregate of grains and grain boundaries in a polycrystal will require a new approach. Here we discuss two models for properties of polycrystalline materials, including their advantages and drawbacks, and indicate the microstructural variables available to optimize properties.

On the Role of Schottky Disorder on the Stability and Structure of (100) Twist Grain Boundaries in Nio

1983 ◽  
Vol 24 ◽  
Author(s):  
D. Wolf
Keyword(s):  
Grain Boundaries ◽  
Point Defects ◽  
Coincidence Site Lattice ◽  
Unit Cell ◽  
Twist Boundary ◽  
Site Lattice ◽  
Metastable Structures ◽  
The Stability ◽  
Twist Boundaries

ABSTRACTRecent calculations on (100) coincidence-site lattice (CSL) twist boundaries in the NaCl structure have shown that without point defects these boundaries are only marginally stable. Following an earlier suggestion that point defects are the likely source for the considerable stability of these boundaries observed experimentally for Mgo and NiO, Tasker and Duffy have shown recently that the creation of a Schottky pair can, indeed, stabilize a (100) twist boundary in NiO. In this article a variety of configurations in which one or more Schottky pairs have been created in the perfect CSL or anti-CSL unit cell are investigated. It is concluded that many metastable structures may exist which differ mainly with respect to their different interfacial mass densities and the relative translation of the two halves of the bicrystal.

Distribution of CSL grain boundaries in oriented cemented carbides

CrystEngComm ◽  
2016 ◽  
Vol 18 (3) ◽  
pp. 471-479 ◽  
Author(s):  
Xilong Wang ◽  
Xiaoyan Song ◽  
Haibin Wang ◽  
Xuemei Liu ◽  
Xingwei Liu ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Composite Powder ◽  
Coincidence Site Lattice ◽  
Cemented Carbides ◽  
Site Lattice

The anisotropy of distributions of specific WC planes and coincidence site lattice (CSL) grain boundaries can be tailored by adjusting the composition of the WC–Co composite powder and its sintering parameters.

Grain boundary in textured YBa2Cu3O7−δ superconductor

1991 ◽  
Vol 6 (12) ◽  
pp. 2507-2518 ◽  
Author(s):  
Yimei Zhu ◽  
H. Zhang ◽  
H. Wang ◽  
M. Suenaga
Keyword(s):  
Grain Boundaries ◽  
Coincidence Site Lattice ◽  
Large Angle ◽  
Low Energy ◽  
Site Lattice ◽  
Microscopy Technique ◽  
Rotation Axes ◽  
Transmission Electron ◽  
Complex Crystal Structure ◽  
Complex Crystal

The misorientations of over 200 pairs of adjacent grains separated by grain boundaries in textured YBa2Cu3O7−δ were measured using a transmission electron microscopy technique. The results indicate that there exist discrete preferred rotation angles and rotation axes. The existence of low-energy boundaries is inferred. The results are analyzed based on the Constrained Coincidence Site Lattice (CCSL) and O2-lattice theories and imply the applicability of such theories for the case of large-angle grain boundaries in a complex crystal structure such as YBa2Cu3O7−δ. The results of analysis also show that some boundaries are likely to be reduced in oxygen near the boundary to satisfy the constraint of the coincidence site lattice.

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