Microstructure and Mechanistic Study of Creep in Titanium Alloys
Final rept. 1 Aug 2001-31 Jul 2002
OHIO STATE UNIV COLUMBUS DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Titanium alloys are attractive structural materials because of their high strength to weight ratio and excellent corrosion resistance. Alloys such as Ti-6242 and Ti-6A1-4V are used extensively in aero-engine and aerospace applications, as well as in the biomedical field due to their relatively good bio-compatibility. In spite of their high strength, it has been recognized for some time that Ti alloys must be employed conservatively because their tendency to creep significantly at room temperature, even at stresses well below the macroscopic yield strength. In this AFOSR funded program, we have developed an improved phenomenological and mechanistic understanding of room temperature creep. Primary creep is the dominant mode of deformation for titanium alloys at lower temperatures under most service conditions. Significant levels of creep strain may occur at stresses, which are well below the yield strength of these alloys. The goals of this research program have been to ascertain the mechanisms, which contribute to primary creep at lower temperatures, and t determine the influence of the prominent microstructural elements on primary creep in these alloys.
- Metallurgy and Metallography