Niobium silicides for high temperature applications. Final technical report, 1 August 1989-31 December 1992
The processing and properties of advanced intermetallics based on aluminide and silicide matrices have been investigated. Vacuum hot press techniques were utilized to produce both monolithic and composite Ni3Al, NiAl, and Nb5Si3. The effects of 10 volume percent TiB2 particulate's on the fracture toughness of Ni3Al and NiAl were determined while in-situ monitoring of the fracture toughness tests was conducted with the aid of a deformation stage mounted inside a scanning electron microscope. The Nb5Si3 powders were produced via reaction synthesis followed by hot press consolidation and evaluation of fracture toughness on both the monolithic silicide as well as in-situ Nb5Si3 /Nb composites. The Nb particles imparted significant toughening while both crack bridging and ductile phase toughening were observed in the in-situ fracture studies. Significant effects of loading rate on the resulting toughness was observed.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering
- OSTI ID:
- 6543207
- Report Number(s):
- AD-A-262334/6/XAB; CNN: AFOSR-89-0508
- Country of Publication:
- United States
- Language:
- English
Similar Records
Intermetallic matrix composites; Proceedings of the MRS Symposium, San Francisco, CA, Apr. 18-20, 1990
Loading rate and test temperature effects on fracture of in situ niobium silicide-niobium composites
Related Subjects
360200* -- Ceramics
Cermets
& Refractories
360600 -- Other Materials
ALLOYS
ALUMINIUM COMPOUNDS
CHEMICAL PREPARATION
COMPOSITE MATERIALS
CRACKS
DATA
DEFORMATION
DUCTILITY
ELECTRON MICROSCOPY
FABRICATION
FRACTURE PROPERTIES
HOT PRESSING
INFORMATION
INTERMETALLIC COMPOUNDS
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSCOPY
NIOBIUM COMPOUNDS
NIOBIUM SILICIDES
NUMERICAL DATA
PHYSICAL PROPERTIES
POWDERS
PRESSING
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SILICIDES
SILICON COMPOUNDS
STATISTICAL DATA
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS