EVALUATION OF SAPPHIRE WOOL AND ITS INCORPORATION INTO COMPOSITES OF HIGH STRENGTH.
Final summary technical rept. May 65-Jun 66,
GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV
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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.
- COMPOSITE MATERIALS)
- (*COMPOSITE MATERIALS
- ALUMINUM COMPOUNDS
- CRYSTAL GROWTH
- TENSILE PROPERTIES
- ELECTRON MICROSCOPY
- X RAY DIFFRACTION
- ALUMINUM ALLOYS
- TITANIUM ALLOYS
- Laminates and Composite Materials