Site occupancy in solid solutions of Nb in the intermetallic compounds TiAl and Ti/sub 3/Al

Journal Article · Sat Feb 01 00:00:00 EST 1986 · Scr. Metall.; (United States)

OSTI ID:5851574

Konitzer, D G; Jones, I P; Fraser, H L

Ti aluminides are receiving attention as potential candidates for elevated temperature applications. The compounds Ti/sub 3/Al and TiAl both exhibit reasonable strength at elevated temperatures but have limited ductilities at room temperature. In the case of Ti/sub 3/Al there appear to be two causes for this limited ductility: firstly, an inhomogeneous distribution of slip dislocations and secondly, a lack of a significant number of dislocations which have Burgers vectors with a c-component. It has been found that significant additions of Nb to Ti/sub 3/Al improve mechanical properties, both strength and ductility. These improvements have been attributed to an increase in the number of dislocations with Burgers vectors having c-component.

• Research Organization: Department of Metallurgical Enineering and Materials Research Laboratory, University of Illinois, 1304 W. Green, Urbana, IL 61801
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5851574
• Journal Information: Scr. Metall.; (United States), Vol. 20:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CRYSTAL LATTICES
DISLOCATIONS
DUCTILITY
TITANIUM BASE ALLOYS
BURGERS VECTOR
DISSOLUTION
INTERMETALLIC COMPOUNDS
NIOBIUM ADDITIONS
SOLID SOLUTIONS
TEMPERATURE EFFECTS
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISPERSIONS
LINE DEFECTS
MECHANICAL PROPERTIES
MIXTURES
NIOBIUM ALLOYS
SOLUTIONS
TENSILE PROPERTIES
TITANIUM ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties