Effect of Omega Phase on Selected Properties of Beta III Titanium Alloy.
Final rept. Feb 71-Nov 74,
COLT INDUSTRIES INC PITTSBURGH PA CRUCIBLE MATERIALS RESEARCH CENTER
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The program objective is to increase the elastic modulus, or modulus-density ratio, of heat treatable beta titanium alloys, while maintaining adequate levels of strength, ductility and toughness by suitable thermomechanical processing and thermal treatments. Material from production and laboratory heats, centering on the Beta III alloy Ti-11.5Mo-6Zr-4.5Sn, was evaluated by correlating microstructural features with mechanical properties for material subjected to various thermal-mechanical process sequences and thermal treatments. The results show that the elastic modulus can be increased by 1 an increase in the proportion of the high modulus alpha phase, 2 judicious increase in the amount of omega, and 3 an increase in the molybdenum content of the beta phase. Transformation kinetics within the omega formation temperature range and the nature of the omega to alpha transformation are discussed.
- Properties of Metals and Alloys