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Phase Stability of Sigma + Beta Microstructures in the Ternary Nb-Ti-Al System
Published online by Cambridge University Press: 21 February 2011
Abstract
An alloy with the nominal composition 42Nb-28Ti-30Al (at.%) was heat treated in the sigma + beta phase region. The evolution of σ phase from the metastable β phase and the stability of the two-phase microstructure at various aging temperatures were evaluated using TEM techniques. The results indicate that the β phase in equilibrium with the σ phase at high temperatures decomposes to the orthorhombic phase at temperatures below 1200°C.
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