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Title: Constant stress of XD trademark TiAl containing nitrogen

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