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Mechanical Properties of Spray Atomized SiC Particle Reinforced Aluminum-Titanium Alloys
Final rept. Oct 1989-Oct 1990
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHNOLOGY DEPT
Pagination or Media Count:
In the present study, the elevated temperature mechanical behavior and microstructure of Al-Ti-Silicon carbide particulates SiCp metal matrix composites MMCs processed by spray atomization and co deposition were investigated. The elevated temperature mechanical properties of the spray deposited and hot extruded materials were studied following a 100 hour exposure at 250, 350, 450 C the mechanical properties at room temperature were also determined. The results of the present study show that the elevated temperature yield strength of the spray deposited and extruded materials compared favorably to those of an equivalent alloy made by powder metallurgical materials, were superior to those of the ingot material, but were inferior to those of mechanically alloyed Al-Ti materials. The evolution of the microstructure as a result of the thermal annealing was investigated using X-ray diffraction, TEM, and optical microscopy. The results from X-ray diffractometry studies showed extensive precipitation of the equilibrium Al3Ti phase during thermal exposure. In addition, no interfacial reactions were observed.
APPROVED FOR PUBLIC RELEASE