Accession Number : ADA185200

Title :   Micromechanisms of Fatigue Crack Growth and Fracture Toughness in Metal Matrix Composites.

Descriptive Note : Technical rept. 29 Apr 86-31 Jul 87,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Davidson, David L

PDF Url : ADA185200

Report Date : Aug 1987

Pagination or Media Count : 29

Abstract : Fatigue crack growth and fracture toughness of seven combinations of aluminum matrix alloys reinforced with particulate silicon carbide have been measured. The matrix alloys used were of both the work hardening and heat treatable varieties. Two of the alloys were made by mechanical alloying--powder metallurgy fabrication methods and the remainder were made by ingot metallurgy. Composites were tested in both as-received (extruded) and peakaged conditions. Fractography was done for all the composites, as were cross sections to examine surface roughness.

Descriptors :   *METAL MATRIX COMPOSITES, *ALUMINUM ALLOYS, *CARBON REINFORCED COMPOSITES, *CRACK PROPAGATION, *TOUGHNESS, POWDER METALLURGY, FRACTURE(MECHANICS), SILICON CARBIDES, FRACTOGRAPHY, STRENGTH(MECHANICS), MICROCRACKING, FATIGUE(MECHANICS), PARTICULATES, MODULUS OF ELASTICITY

Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE