Investigation of Basic Creep Mechanisms of Titanium Alloys.
Final rept. 1 Aug 73-1 Aug 74,
ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CALIF SCIENCE CENTER
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Rate controlling creep mechanisms in Ti alloys were studied at 1000F as a function of stress, alloy composition, and heat treatment. Alloying additions of Si, Bi, Ge, Fe, Mo and Nb were added to a base alloy composition of Ti-5Zr-5Al and their effect on creep behavior established. The results of this model alloy study showed dislocation creep was the rate controlling creep mechanism in all alloys, with precipitation on mobile dislocations becoming important in limiting dislocation mobility in the alloys containing Si. In addition, the model alloy study resulted in the selection of two alloys that showed good creep resistance for further creep and mechanical properties evaluations. These were Ti-5Al-5Zr-0.5Si and Ti-5Al-5Zr-1Mo-0.5Si. Together with the two model alloys two Si bearing commercial alloys, Ti-11 and IMI-685, were also studied. Modified author abstract
- Metallurgy and Metallography