Grain boundary structure far from high density coincidence site lattice orientation relationship in ferritic stainless steel

1983 ◽  
Vol 31 (11) ◽  
pp. 1909-1917 ◽  
Author(s):  
H.O. Martikainen ◽  
V.K. Lindroos
Keyword(s):  
Stainless Steel ◽  
Grain Boundary ◽  
Orientation Relationship ◽  
Ferritic Stainless Steel ◽  
Coincidence Site Lattice ◽  
High Density ◽  
Boundary Structure ◽  
Lattice Orientation ◽  
Site Lattice ◽  
Grain Boundary Structure

The hierarchy of grain boundary structures in SiC bicrystals

1988 ◽  
Vol 46 ◽  
pp. 596-597
Author(s):  
Y. Ishida ◽  
H. Ichinose ◽  
Y. Inomata
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Lattice Theory ◽  
Coincidence Site Lattice ◽  
Boundary Structure ◽  
Geometrical Theory ◽  
Site Lattice ◽  
Atomic Structures ◽  
Grain Boundary Structure ◽  
Predictive Role

The standard geometrical theory having been developed to describe periodically ordered grain boundaries in metals, ie coincidence-site lattice theory faces a new frontier to be expanded in terms of hierarchy of atomic structures in low energy grain boundaries of polytype SiC bicrystals. The unit translation lattice of the polytype crystal is large and elongated in the direction perpendicular to the basal plane. With the elongated translation lattice, the coincidence-site lattice is generally very large. Often too large to be physically significant, although the predictive role of the coincidence-site lattice theory in specifying the orientation of periodically ordered interface was still preserved. Such periodically ordered boundaries were indeed found to occur in the present SiC bicrystals as is predicted by the geometrical theory. A dual description of the grain boundary structure in terms of hierarchy of atomic structures is shown useful in characterizing the bicrystal boundaries.High purity SiC bicrystals were produced by sublimation-deposition method by cooling the encapseled SiC slowly from 2800K.

Observations and implications of grain boundary dislocation networks in high-angle YBa2Cu3O7−δ grain boundaries

1990 ◽  
Vol 5 (5) ◽  
pp. 919-928 ◽  
Author(s):  
S. E. Babcock ◽  
D. C. Larbalestier
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Weak Link ◽  
Coincidence Site Lattice ◽  
Boundary Structure ◽  
High Angle ◽  
Grain Boundary Structure ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Regular Networks

Regular networks of localized grain boundary dislocations (GBDs) have been imaged by means of transmission electron microscopy in three different types of high-angle grain boundaries in YBa2Cu3O7-δ, implying that these boundaries possess ordered structures upon which a significant periodic strain field is superimposed. The occurrence of these GBD networks is shown to be consistent with the GBD/Structural Unit and Coincidence Site Lattice (CSL)/Near CSL descriptions for grain boundary structure. Thus, these dislocations appear to be intrinsic features of the boundary structure. The spacing of the observed GBDs ranged from ∼10 nm to ∼100 nm. These GBDs make the grain boundaries heterogeneous on a scale that approaches the coherence length and may contribute to their weak-link character by producing the “superconducting micro-bridge” microstructure which has been suggested on the basis of detailed electromagnetic measurements on similar samples.

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