Reinforcement shape effects on the fracture behavior and ductility of particulate-reinforced 6061-Al matrix composites

Journal Article · Fri Nov 01 00:00:00 EST 1996 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/BF02595465· OSTI ID:413303

Song, S G; Shi, N; Gray, III, G T; Roberts, J A ^[1]

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1. Los Alamos National Lab., NM (United States)

Particle shape effects on the fracture and ductility of a spherical and an angular particulate-reinforced 6061-Al composite containing 20 pct vol Al{sub 2}O{sub 3} were studied using scanning electron microscopy (SEM) fractography and modeled using the finite element method (FEM). The spherical particulate composite exhibited a slightly lower yield strength and work hardening rate but a considerably higher ductility than the angular counterpart. The SEM fractographic examination showed that during tensile deformation, the spherical composite failed through void nucleation and linking in the matrix near the reinforcement/matrix interface, whereas the angular composite failed through particle fracture and matrix ligament rupture. The FEM results indicate that the distinction between the failure modes for these two composites can be attributed to the differences in the development of internal stresses and strains within the composites due to particle shape.

• Sponsoring Organization: USDOE
• OSTI ID: 413303
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 27, Issue 11; Other Information: PBD: Nov 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
FRACTURE PROPERTIES
DUCTILITY
MICROSTRUCTURE
ALUMINIUM BASE ALLOYS
MAGNESIUM ALLOYS
ALUMINIUM OXIDES
SILICON ADDITIONS
IRON ADDITIONS
COPPER ADDITIONS
MANGANESE ADDITIONS
CHROMIUM ADDITIONS
STRESSES
STRAINS
CONCENTRATION RATIO
SCANNING ELECTRON MICROSCOPY
FRACTOGRAPHY
MATHEMATICAL MODELS
FINITE ELEMENT METHOD
YIELD STRENGTH
STRAIN HARDENING
POROSITY
INTERFACES