Arrangement of dislocation networks in hot-pressed titanium diboride
Journal Article
·
· Scripta Metallurgica et Materialia
- Los Alamos National Lab., NM (United States). Materials Division
Transmission electron microscopy identified two types of dislocation networks in as-received titanium diboride. Hexagonal dislocation networks composed of 1/3<11{bar 2}0> type dislocations were identified and are a result of the interaction between parallel sets of a type dislocations on individual prism planes. Dislocations forming the hexagonal networks result in a reduction of energy, and are considered equilibrium structures. Square dislocation networks composed of 1/3<11{bar 2}0>, [0001], and 1/3<11{bar 2}3> type dislocations on basal, prism, and pyramidal planes were identified and are the result of parallel sets of ``a`` type dislocations reacting with parallel sets of ``c`` type dislocations to form unstable short dislocation segments composed of ``a + c`` type dislocations. Dislocations arranged in square networks do not result in an energy reduction, and are considered quasi-equilibrium configurations, more likely to dissociate or reorganize during deformation or further thermal processing than dislocations in the hexagonal coordination.
- OSTI ID:
- 99251
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 2 Vol. 33; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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