Zirconia-toughening of nickel aluminide
- Russian Academy of Sciences, Moscow (Russian Federation). High-Tech Ceramics Research Centre
The fracture toughness and strength behavior of nickel aluminide toughened by partially stabilized zirconia dispersoids was investigated in the range zirconia content up to 40 vol%. In addition, the temperature dependence of the mechanical properties was examined. Composites were fabricated using attrition milling followed by hot uniaxial pressing of powder mixtures. A considerable increase in fracture toughness and bending strength is achieved by adding zirconia particles. The maximal level of the mechanical properties corresponds to zirconia content in the range 20-25 vol%. A positive temperature dependence of the fracture toughness was established up to 500C. It was concluded, on the basis of residual stress analysis, that room-temperature toughening is due to mainly stress-induced phase transformation. A positive temperature dependence of toughening can be attributed to an increase in the stress relaxation near the crack tip.
- OSTI ID:
- 6238872
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:3; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHALCOGENIDES
FRACTURE PROPERTIES
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RELAXATION
STRESS RELAXATION
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES