Accession Number : AD0805285

Title :   EVALUATION OF SAPPHIRE WOOL AND ITS INCORPORATION INTO COMPOSITES OF HIGH STRENGTH.

Descriptive Note : Final summary technical rept. May 65-Jun 66,

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : Mehan, R. L. ; Bruch, C. A. ; Feingold, E.

Report Date : DEC 1966

Pagination or Media Count : 167

Abstract : This program was concerned with (1) the fabrication of alpha-Al2O3 wool whisker-aluminum composites of high strength, (2) the characterization of the resulting composites and (3) the determination of the strength of alpha-Al2O3 wool whiskers as affected by various fabrication processes. The results of this program over the past contract year are summarized as follows: (1) Composite strengths as high as 54,900 psi at 532 C were obtained. This represents about a hundred-fold strength increase over pure aluminum and, on a strength to density ratio, is competitive with titanium alloys at the same temperature. A total of 62 specimens were fabricated and tested during the contract period. (2) Tests on individual whiskers revealed (a) metal coatings have no deleterious effects on whisker strength after a high temperature heat-treatment, (b) high temperature properties of Ni/Ti coated whiskers are the same as uncoated whiskers, and (c) no strength degradation was detected in whiskers which had been extracted from an infiltrated composite.

Descriptors :   *ALUMINUM), (*SAPPHIRE, COMPOSITE MATERIALS), (*COMPOSITE MATERIALS, WHISKERS(CRYSTALS), ALUMINUM COMPOUNDS, OXIDES, COATINGS, NICKEL, TITANIUM, CRYSTAL GROWTH, SPUTTERING, IMPREGNATION, LATHES, MACHINING, GLASS, METALLOGRAPHY, TENSILE PROPERTIES, BENDING, ELECTRON MICROSCOPY, X RAY DIFFRACTION, STRAIN(MECHANICS), ALUMINUM ALLOYS, TITANIUM ALLOYS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE