Fabrication and mechanical behavior of aluminum-matrix composite materials

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5398743

Lim, Taewon

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
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation &amp; Manufacture
360603 -- Materials-- Properties
AGING
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
FABRICATION
FRACTURE PROPERTIES
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
WEAR