Fabrication and mechanical behavior of aluminum-matrix composite materials
Aluminum-matrix composite materials containing SiC whisker and Saffil alumina short fiber were fabricated by the squeeze-case glting method. It was demonstrated that the direct-squeeze-filtration method is suitable for discontinuously reinforced metal-matrix composites (discontinuous MMCs) whose volume fractions are in the range of 0.15-0.3; squeeze casting of compounds for the fabrication of discontinuous MMCs with less volume fractions (<0.1). Mechanical properties, such as Young's modulus and ultimate tensile strength, are improved up to 80% by the addition of reinforcement. However, at 300C their 70% of strength at room temperature is maintained in Al/SiC, and 40% in Al/Al{sub 2}O{sub 3} composites. Hardness is improved remarkably by the incorporation of reinforcement. The peak aging time decreases with increasing the aging temperature and decreasing the volume fraction of reinforcement. Wear resistance of composite is improved up to 1000%. The major wear mechanism of discontinuous MMCs is strongly dependent upon the sliding speed. From fracture surface analyses at room and elevated temperatures, it is found that the failure mode is ductile at the microstructural level and becomes more ductile as temperature increases.
- Research Organization:
- State Univ. of New York, Buffalo, NY (United States)
- OSTI ID:
- 5398743
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
FABRICATION
MECHANICAL PROPERTIES
ALUMINIUM OXIDES
COMPOSITE MATERIALS
SILICON CARBIDES
AGING
FRACTURE PROPERTIES
MATRIX MATERIALS
REINFORCED MATERIALS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
WEAR
ALLOYS
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
MATERIALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
TEMPERATURE RANGE
360601* - Other Materials- Preparation & Manufacture
360603 - Materials- Properties