Particle shape effects on the fracture of discontinuously-reinforced 6061-A1 matrix composites

Conference · Wed May 01 04:00:00 EDT 1996

OSTI ID:236059

Shi, N; Song, S G; Gray, III, G T; Roberts, J A

Effects on fracture and ductility of a spherical and an angular particulate-reinforced 6061-Al composite containing 20(vol)% Al{sub 2}O{sub 3} were studied using SEM fractography and modeled using 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. SEM fractography 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. FEM results indicate that the distinction between the failure modes for these two composites can be attributed to differences in development of internal stresses and strains within the composites due to particle shape.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 236059
• Report Number(s): LA-UR--96-801; CONF-960202--26; ON: DE96009783
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
ALUMINIUM OXIDES
COMPOSITE MATERIALS
FAILURE MODE ANALYSIS
MECHANICAL PROPERTIES
REINFORCED MATERIALS