Coincidence Structural Unit Models for Grain Boundaries in HCP Metals.
Abstract
CUPY EXACT COINCIDENCE SITES BUT INSTEAD OCCUPY COMPROMISE POSITIONS BETWEEN TWO NEARLY COINCIDENT LATTICE SITES. This extension allows one to define near-coincidence-site lattices (near-CSL's) from which are derived short-period near-coincidence structural units. Exact and near-CSL's in the common hcp metals are tabulated for rotations about (0001), <1,0,-1,0>, and <1,1,-2,0>, and short-period coincidence structural units are presented. Geometric models of a variety of symmetric and asymmetric <1,0,-1,0> tilt boundaries are developed as examples to show how a relatively few coincidence structural units are combined in the structures of both simple and complex boundaries. Although hcp boundaries are treated here, the approach is quite general and can be applied to any crystal structure. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1972
- Accession Number
- AD0756884
Entities
People
- George H. Bishop Jr.
- Gordon A. Bruggeman
- William H. Hartt Iii
Organizations
- United States Army Research Laboratory