DIFFRACTION STUDIES OF THE ATOMIC STRUCTURE OF LARGE ANGLE [001] TWIST BOUNDARIES

1985 ◽  
Vol 46 (C4) ◽  
pp. C4-71-C4-84 ◽  
Author(s):  
K. R. Milkove ◽  
P. Lamarre ◽  
F. Schmückle ◽  
M. D. Vaudin ◽  
S. L. Sass
Keyword(s):  
Atomic Structure ◽  
Large Angle ◽  
Twist Boundaries

scholarly journals Diffraction Studies of the Atomic Structure of Grain Boundaries

1984 ◽  
Vol 41 ◽  
Author(s):  
K. R. Milkove ◽  
P. A. Lamarre ◽  
F. Schmückle ◽  
M. D. Vaudin ◽  
S. L. Sass
Keyword(s):  
Grain Boundaries ◽  
Atomic Structure ◽  
Large Angle ◽  
Boundary Structure ◽  
Twist Boundary ◽  
Bonding Type ◽  
Metal Type ◽  
Twist Boundaries

AbstractThe application of diffraction techniques to study the atomic structure of grain boundaries is reviewed. The determination of the projected structure of a large angle [001] twist boundary is described. The influence of f.c.c. metal type and bonding type on boundary structure is examined. Generalizations are made concerning the structure of large angle [001] twist boundaries based on the results of the diffraction studies.

Atomic structure of (001) twist boundaries in f.c.c metals Structural unit model

1985 ◽  
Vol 51 (4) ◽  
pp. 499-520 ◽  
Author(s):  
D. Schwartz ◽  
V. Vitek ◽  
A. P. Sutton
Keyword(s):  
Atomic Structure ◽  
Structural Unit ◽  
Unit Model ◽  
Twist Boundaries

Structure and misorientation angle distributions of (001) twist grain boundaries in Bi2Sr2Ca1Cu2Oy/Ag composite tapes processed in different oxygen partial pressures

1999 ◽  
Vol 14 (2) ◽  
pp. 349-353 ◽  
Author(s):  
Hiroki Fujii ◽  
Hiroaki Kumakura ◽  
Kazumasa Togano
Keyword(s):  
Grain Boundaries ◽  
Misorientation Angle ◽  
Small Angle ◽  
Large Angle ◽  
Amorphous Layer ◽  
High Energy ◽  
Boundary Structure ◽  
Partial Pressures ◽  
Small Angle Boundary ◽  
Twist Boundaries

We investigated the relationship between the structure and misorientation angle of (001) twist grain boundaries in Bi2Sr2Ca1Cu2Oy/Ag composite tapes processed in different oxygen partial pressures (PO2 = 0.01, 0.21, and 1 atm). Large-angle misoriented twist boundaries (>10°) essentially had no amorphous layers at the interface, and the misorientation angles of these boundaries mostly corresponded to low-energy misorientations. This large-angle misoriented boundary structure was independent of PO2. Small-angle misoriented twist boundaries (<10°), on the other hand, corresponded to high-energy misorientations and sometimes had amorphous layers at the interface. The population of the small-angle boundary with an amorphous layer was very low in the tape processed in PO2 = 1 atm. This suggests that high PO2 during the heat treatment is effective in the improvement of grain coupling, and hence, to increase critical current density.

The role of boundary plane: HREM investigation of the atomic structure of grain boundaries in gold

1988 ◽  
Vol 46 ◽  
pp. 588-589
Author(s):  
K. L. Merkle
Keyword(s):  
Grain Boundaries ◽  
Atomic Structure ◽  
Large Angle ◽  
Boundary Plane ◽  
Low Energy ◽  
Site Density ◽  
Atomic Relaxation ◽  
Tilt Boundaries ◽  
Misorientation Angles

Computer simulations of large-angle grain boundaries (GBs) have indicated the importance of local atomic relaxation, rigid body translations, and of the boundary plane in determining GB energy. Experimental observations of GB structure often find GB faceting, which is an indication that some GB planes are preferred over others. Investigations of the atomic structure of large-angle >001> tilt GBs in NiO have shown, along with symmetrical GB con-figuations, the presence of asymmetric GBs of the type which has at least one of the crystals terminated at the boundary by a low index plane. Such boundaries are thought to be of low energy. For studying the role of the GB plane in a metallic GB we chose in the present work two <011> tilt boundaries in Au. The misorientation angles (θ) were selected such that one bicrystal orientation (θ=39°) was close to the Σ=9 reciprocal coincident site density, while the other (θ=55°) was near the misorientation for which (111) and (100) planes are parallel to each other (θ=54.74°). The latter misorientation is also close to Σ=41 (θ=55.88°).

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