Microstructure and Phase Relations for Ti-Mo-Al Alloys.
Technical rept. 1 Oct 70-30 Sep 71,
RUTGERS - THE STATE UNIV NEW BRUNSWICK N J MATERIALS RESEARCH LAB
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The influence of aluminum additions to a titanium-7 at molybdenum alloy on the phase equilibria was investigated. The microstructures of the alloys, Ti-7 Mo-7 Al, and Ti-7 Mo-16 Al, were determined by light and electron microscopy. It was found that with increasing aluminum concentration the formation of the metastable omega phase was suppressed. In the Ti-7 Mo-16 Al alloy the beta phase decomposed upon quenching by precipitating coherent, ordered particles having a CsCl type of crystal structure beta sub 2. At low temperatures the equilibrium phases for this alloy were beta alpha beta sub 2, whereas at high temperature 850C-950C the Ti3Al phase was in two-phase equilibrium with the beta phase. The four-phase equilibrium which exists at a temperature of about 550C involves the reaction beta Ti3Al reversibly yield alpha beta sub 2. Author
- Properties of Metals and Alloys