Modulus, Strength and Thermal Exposure Studies of FP-Al2O3/Aluminum and FP-Al2O3/Magnesium Composites.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1981
- Accession Number
- ADA118325
Entities
People
- R. T. Bhatt
Organizations
- National Aeronautics and Space Administration