Microstructure and mechanical properties of Ni sub 3 Al endash Al sub 2 O sub 3 composites produced by hot extrusion
Hot extrusion of premixed charges of 10--20 vol% chopped Al{sub 2}O{sub 3} fiber and Ni{sub 3}Al powder has resulted in composite alloys of near theoretical density. In tensile tests at room temperature, density-compensated yield strengths of some of these composite alloys are as good or better than those of as-cast or hot-pressed Ni{sub 3}Al without reinforcement; however strengths at 1000{degree}C in vacuum are lower. The low strength at 1000{degree}C is attributed to a fine grain size (2--3 {mu}m) and the accompanying diffusional creep and grain boundary sliding. This presentation discusses our findings to date and includes microstructural studies and tensile properties, both at room temperature in air and 1000{degree}C in vacuum. 16 refs., 4 figs., 3 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7004518
- Report Number(s):
- CONF-900466-7; ON: DE90009856
- 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
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Related Subjects
ALUMINIUM ALLOYS
MECHANICAL PROPERTIES
ALUMINIUM OXIDES
COMPOSITE MATERIALS
MICROSTRUCTURE
NICKEL BASE ALLOYS
CREEP
DENSITY
EXTRUSION
FIBERS
GRAIN SIZE
INTERMETALLIC COMPOUNDS
TENSILE PROPERTIES
ALLOYS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
FABRICATION
MATERIALS
MATERIALS WORKING
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
360603* - Materials- Properties
360602 - Other Materials- Structure & Phase Studies
360601 - Other Materials- Preparation & Manufacture