The Relationship between the Microstructure and Age Hardening Response in the Metastable Beta Titanium Alloy Ti-11.5Mo-6Zr-4.5Sn (Beta III).
CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF METALLURGY AND MATERIALS SCIENCE
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The effect of solution treatment temperature and oxygen content on the microstructure and age hardening response of the metastable beta alloy Ti-11.5Mo-6Zr-4.5Sn have been studied. Kinetics of formation of the equilibrium alpha-phase and the metastable omega-phase have been followed using Vickers hardness measurements. These kinetics have been examined as a function of solution treatment temperature above or below the beta-transus and initial oxygen of the material. It has been found that the kinetics of formation of omega-phase are relatively insensitive to these variables whereas alpha-phase is quite sensitive. The effect of these variables on microstructure has been evaluated using light microscopy, replica electron microscopy and thin foil transmission electron microscopy. Several duplex aging treatments starting in the omega-phase temperature range and finishing in the alpha-phase temperature range were also examined. TEM of these samples has provided some inside into the mechanism of the omega-approach alpha in-situ transformation. Author
- Properties of Metals and Alloys