Accession Number : ADA188981

Title :   Processing, Microstructure, and Mechanical Properties of Silicon Carbide Particulate Reinforced Aluminum Alloys.

Descriptive Note : Final rept. 10 Sep 84-31 Oct 87,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : Fujiwara, Chikara ; Blucher, Joseph ; Cornie, James A

PDF Url : ADA188981

Report Date : 14 Jan 1988

Pagination or Media Count : 67

Abstract : SiC particulate reinforced A1-2%Mg composites were produced at volume fractions 0.1, 0.2, and 0.3 by inert atmosphere ball milling followed by Hot Isostatic Pressing consolidation and extrusion. The SiC particulate sizes evaluated were 5 microns, 1 micron, and 0.2 microns. The processing sequences were carefully controlled to minimize oxygen contamination. The resulting microstructures of the as-extruded materials showed a very uniform distribution of particulates within the matrix. Ultimate strength, 0.2% yield strength, and modulus of elasticity increased with decreasing SiC particulate size: 1 micron SiC-A1 matrix showed the highest elongation. Fractures originated at inclusions rich in iron, chromium, and nickel. These contaminants seemed to come from the mill chamber and/or the hardened steel balls during ball milling. Keywords: Silicon carbide, Composites, Ball milling, Microstructure.

Descriptors :   *ALUMINUM ALLOYS, *METAL MATRIX COMPOSITES, *FIBER REINFORCED COMPOSITES, BALL MILLS, CHROMIUM, CONTAMINATION, DISTRIBUTION, ELONGATION, EXTRUSION, HOT PRESSING, IRON, ISOSTATIC PRESSING, MECHANICAL PROPERTIES, MICROSTRUCTURE, MODULUS OF ELASTICITY, NICKEL, OXYGEN, PARTICULATES, PROCESSING, SEQUENCES, PARTICLE SIZE, POWDER ALLOYS, SILICON CARBIDES

Subject Categories : Fabrication Metallurgy
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE