The relationship between the microstructure and age hardening response in the metastable beta titanium alloy Ti--11. 5Mo--6Zr--4. 5Sn (beta III). Technical report
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 Vicker's 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 is 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 insight into the mechanism of the omega ..-->.. alpha in-situ transformation.
- Research Organization:
- Carnegie-Mellon Univ., Pittsburgh, Pa. (USA). Dept. of Metallurgy and Materials Science
- DOE Contract Number:
- N00014-76-C-0409
- OSTI ID:
- 6942024
- Report Number(s):
- AD-A-048773; JWTR-3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MOLYBDENUM ALLOYS
AGE HARDENING
MICROSTRUCTURE
TIN ALLOYS
TITANIUM BASE ALLOYS
ZIRCONIUM ALLOYS
HEAT TREATMENTS
OXYGEN
PHASE STUDIES
QUATERNARY ALLOY SYSTEMS
REACTION KINETICS
ALLOY SYSTEMS
ALLOYS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELEMENTS
FLUIDS
HARDENING
KINETICS
NONMETALS
TITANIUM ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies
360101 - Metals & Alloys- Preparation & Fabrication