Accession Number : ADA118325

Title :   Modulus, Strength and Thermal Exposure Studies of FP-Al2O3/Aluminum and FP-Al2O3/Magnesium Composites.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Personal Author(s) : Bhatt,R T

PDF Url : ADA118325

Report Date : Jan 1981

Pagination or Media Count : 18

Abstract : Several approaches were used to improve the mechanical properties of FP-Al2O3 fiber reinforced composites prepared by liquid metal infiltration techniques. The first approach was the incorporation of a strengthening addition, magnesium, to the aluminum-lithium matrix alloy usually selected for these composites because of its good wetting characteristics. This ternary composite FP-Al2O3/Al-(2-3)Li(3-5)Mg, showed improved transverse strength compared with FP-Al2O3/Al-(2-3)Li composites. The lower axial strengths found for the FP-A12O3/A1-(2-3)Li-(3-5)Mg composites were attributed to fabrication-related defects. The second approach was the use of Ti/B coated FP-A12O3 fibers in the composites. This coating is readily wet by molten aluminum and permitted the use of more conventional aluminum alloys in the composites. However, the anticipated improvements in the axial and transverse strengths were not obtained due to poor bonding between the fiber coating and the matrix.

Descriptors :   *FIBER REINFORCED COMPOSITES, *MODULUS OF ELASTICITY, *STRENGTH(GENERAL), *THERMAL PROPERTIES, TERNARY COMPOUNDS, ALUMINUM ALLOYS, LITHIUM ALLOYS, MAGNESIUM ALLOYS, MATRIX MATERIALS, ALUMINUM OXIDES, FIBER REINFORCEMENT, WETTING, THERMAL STRESSES, ISOTHERMS, THERMAL STABILITY

Subject Categories : Laminates and Composite Materials
      Metallurgy and Metallography
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE