Compatibility Studies for Viable Titanium Matrix Composites.
Final technical rept. 1 May 68-31 Jul 70,
SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
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Two titanium alloys have been developed with 100 and 600 times the compatibility for boron over that of unalloyed titanium. The compositions are Ti13-10 - Ti-13V-10Mo-5Zr-2.5Al, and Ti22-3 - Ti-22V-3W-5Zr-2.5Al. The annealed alloys are beta solid solutions that have been developed with desirable properties for a composite matrix. Ductilities are excellent, strengths are not less than 130,000 psi, proportional limits are high at room temperature, and alloy stability appears adequate for composite use. In addition, foils needed for composite fabrication can be made from these alloys, and these foils can be readily consolidated by diffusion bonding. Extensive compatibility data were generated showing the effects of alloying elements on the reaction constants at 1400F, and some data were developed for other temperatures. Vanadium was shown to have the most potent effect on reducing reaction constants. A special effect was noted for molybdenum when added in amounts greater than 5 percent. Supporting Research to this alloy development showed that the tolerance of longitudinal tensile properties for the interaction between boron and a titanium matrix increased with an increased matrix strength. The transverse strength is not affected by the Ti-B interaction because the filaments and the interface are too weak in transverse loading to contribute to strength. However, the filaments stiffen the composite elastically to an appreciable extent before failure. Unidirectional titanium-boron composites are, therefore, not highly anisotropic. Author
- Laminates and Composite Materials