Composites strengthening. Final report, 1985-1987

Technical Report · Sun Nov 01 04:00:00 EST 1987

OSTI ID:5184779

Arsenault, R J

In all cases of discontinuous silicon carbide/aluminum metal matrix it was previously shown that classical composite strengthening mechanisms could not be used to explain the data. A high-dislocation-density model was proposed to account for the strengthening, but other factors such as residual stress and texture could contribute. These were investigated and it was shown that texture had no effect and residual stress reduced the tensile yield stress. The fracture process is matrix-controlled up to SiC particle sizes of 20 micrometers and above where fracture of SiC begins to dominate. The matrix is influenced by residual hydrostatic tension and high density of dislocations generated at SiC/Al interfaces. Crack-initiation fracture toughness does not depend on SiC particle size. Crack growth fracture toughness increases as the size of the SiC particles increases.

• Research Organization: Maryland Univ., College Park (USA). Metallurgical Materials Lab.
• OSTI ID: 5184779
• Report Number(s): AD-A-189258/7/XAB; MML-1987-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALUMINIUM
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRACK PROPAGATION
DENSITY
DOCUMENT TYPES
ELECTRON MICROSCOPY
ELEMENTS
FRACTURE PROPERTIES
HYDROSTATICS
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSCOPY
PARTICLE SIZE
PHYSICAL PROPERTIES
PROGRESS REPORT
SILICON CARBIDES
SILICON COMPOUNDS
SIZE