Constant stress of XD trademark TiAl containing nitrogen

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:7123802

Robertson, E; Martin, P L

Ti-47at%Al+7vol%(TiN+TiB{sub 2}) alloys, produced by the Martin Marietta XD{trademark} process, were subjected to tensile constant stress creep deformation in the range 760--850{degree}C temperature and 138--276 MPa (20--40 ksi) stress. These alloys have a matrix of TiAl and Ti{sub 3}Al initially containing 1 to 10 {mu}m diameter equiaxed particles of TiB{sub 2} and Ti{sub 2}AlN. Microstructures were examined using optical, SEM and TEM methods in an attempt to correlate the substructures with the property data. In particular, fine coherent particles have been observed to decorate dislocations and the interior of TiAl grains. The presence of these particles is thought to explain the creep resistance of this alloy. 14 refs., 5 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7123802
• Report Number(s): LA-UR-90-1552; CONF-900466-47; ON: DE90011947
• Resource Relation: Conference: Spring meeting of the Materials Research Society, San Francisco, CA (USA), 16-21 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CREEP
TITANIUM ALLOYS
DISLOCATIONS
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NITRIDES
STRAIN RATE
TITANIUM BORIDES
VERY HIGH TEMPERATURE
ALLOYS
BORIDES
BORON COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
LINE DEFECTS
MECHANICAL PROPERTIES
NITROGEN COMPOUNDS
PNICTIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies