Enhancement of mechanical strength in hot-pressed TiB/sub 2/ composites by the addition of Fe and Ni
Conference
·
OSTI ID:6343690
Improvement in the fracture strength of TiB/sub 2/ composites through the addition of Fe and Ni is reported. Beam specimens containing up to 20 wt % of the metal component were fabricated by hot pressing above the eutectic temperature. Four point bending results indicated that the observed enhancement in strength was proportional to the vol % of the metal present. The results also revealed that TiB/sub 2/--Ni composites have slightly better strength than TiB/sub 2/--Fe samples at elevated temperatures, and that their strengths were consistently about twice that of pure TiB/sub 2/. They also did not exhibit any serious degradation in strength up to 700/sup 0/C. The fracture behavior was characterized using optical and scanning electron microscopy. The strengthening appears to be related to the presence of a metallic grain boundary phase between TiB/sub 2/ particles. The results further suggested that the formation of a special eutectic-like grain microstructure could render additional strengthening.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6343690
- Report Number(s):
- CONF-781093-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
BORIDES
BORON COMPOUNDS
CRACKS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FRACTURE PROPERTIES
HARD FACING
IRON
IRON ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NICKEL
NICKEL ALLOYS
PHYSICAL PROPERTIES
POROSITY
STABILITY
TEMPERATURE DEPENDENCE
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WEAR RESISTANCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
BORIDES
BORON COMPOUNDS
CRACKS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FRACTURE PROPERTIES
HARD FACING
IRON
IRON ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NICKEL
NICKEL ALLOYS
PHYSICAL PROPERTIES
POROSITY
STABILITY
TEMPERATURE DEPENDENCE
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WEAR RESISTANCE