A study of grain boundary translational states in a [sigma] 3[110]/(111) bicrystal
- Dept. of Materials Science and Engineering, Univ. of Arizona, Tucson, AZ (United States)
This paper reports on high-resolution electron microscopy images of a [sigma] [[bar 1]10]/([bar 1]1) bicrystal produced by heavy cold rolling and annealing which show a multiplicity of grain boundary core structures. Two grain boundary states are separated by a partial grain boundary dislocation with Burgers vector b = 1/2 b[sub 1] (where b[sub 1] = 1/6[112] is the Burgers vector of a secondary dislocation). This implies a change in translational state. All other structures are related through continuous transport of atoms from one grain to the other resulting in [[bar 1]1] grain boundary steps. Calculations of the energy associated with the observed structures indicate that the two perfect twin states t = 0 and 2b[sub 1] are stable, while all other grain boundary translational states are metastable.
- Sponsoring Organization:
- NSF; National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 6907164
- Journal Information:
- Acta Metallurgica; (United States), Journal Name: Acta Metallurgica; (United States) Vol. 39:7; ISSN 0001-6160; ISSN AMETAR
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
664100 -- Theory of Electronic Structure of Atoms & Molecules-- (1992-)
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ACTIVATION ENERGY
ALLOY SYSTEMS
ANNEALING
ATOM TRANSPORT
BINARY ALLOY SYSTEMS
BURGERS VECTOR
CALCULATION METHODS
COLD WORKING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DISLOCATIONS
ELECTRON MICROSCOPY
ENERGY
FABRICATION
GRAIN BOUNDARIES
HEAT TREATMENTS
LINE DEFECTS
MATERIALS WORKING
MICROSCOPY
MICROSTRUCTURE
NEUTRAL-PARTICLE TRANSPORT
PHASE TRANSFORMATIONS
RADIATION TRANSPORT
TRANSMISSION ELECTRON MICROSCOPY