Structural unit/grain boundary dislocation model for twist boundaries in cubic crystals

Technical Report · Mon Oct 01 04:00:00 EDT 1984

OSTI ID:6325915

Bristowe, P D; Balluffi, R W

The systematics of (001) twist boundary structure is presented formally in terms of a structural unit/grain boundary dislocation hierarchical model and the earlier model of Sutton is generalized. By comparison with experimental observation and atomistic calculation using pair-potential models the physical significance of the individual members of the hierarchy is determined. Comparison which experiment indicates a strong <110> type primary relaxation for theta less than or equal to 36.9/sup 0/ and a significant secondary relaxation near ..sigma..5 which must result from oblique perturbations in the array of primary GBD's. On the other hand, comparison with available calculated results indicates a strong <110> type primary relaxation at low angles but a progressively weaker relaxation at higher angles. Also, no evidence is found for any significant secondary relaxations when at least one pair potential is employed. However, very recent studies indicate stronger secondary relaxations with other potentials, and this, in future work, should lead to better agreement between calculations and experiment.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: FG02-84ER45116
• OSTI ID: 6325915
• Report Number(s): DOE/ER/45116-3; ON: TI85000425
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360000* -- Materials
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DISLOCATIONS
GRAIN BOUNDARIES
LINE DEFECTS
MICROSTRUCTURE