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:

1966-12-01

Pagination or Media Count:

167.0

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 NiTi 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