Composite strengthening. Annual report

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6085204

Arsenault, R J

It has been demonstrated that a strong interfacial bond is required to produce the observed strengthening in discontinuous SiC/Al composites. Dislocation generation (which is the strengthening mechanism) is dependent upon a good bond existing between the SiC and the Al matrix. Although it has been shown that the stresses developed in the matrix as a result of the differences in the coefficients of thermal expansion between SiC and Al are greatly reduced by the motion and generation of dislocations, an elastic residual stress can still remain. An investigation was undertaken and it was determined that, in the discontinuous SiC/Al composites, a tensile-elastic-residual stress remains in the matrix. It has been observed that as the strength of the matrix increases, e.g., due to alloying or age hardening, the percentage increase in yield or ultimate tensile strength decreases for a given volume per cent SiC/al composite.

• Research Organization: Maryland Univ., College Park (USA). Engineering Materials Group
• OSTI ID: 6085204
• Report Number(s): AD-A-162423/8/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360301* -- Composite Materials-- Preparation & Fabrication-- (-1987)
AGE HARDENING
ALLOYS
ALUMINIUM
BONDING
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELEMENTS
EXPANSION
FABRICATION
HARDENING
INTERFACES
JOINING
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
METALS
MOTION
REDUCTION
SILICON CARBIDES
SILICON COMPOUNDS
STRESSES
TENSILE PROPERTIES
THERMAL EXPANSION