Abstract
The tensile properties of a metastable β alloy, Ti-15Mo*, in a number of different aged conditions have been correlated with the microstructures observed by TEM. Ageing at a temperature, which is approximately the upper limit of ω phase stability, allowed the α and ω phases to coexist, the a phase apparently having been nucleated on the ω particles. An extremely fine distribution of the α phase was achieved in this way, resulting in increased strength, limited ductility and good toughness. This method of precipitate refinement is then compared with the other treatments which have been applied to metastable β-titanium alloys. Changes in strength due to variations in heating rate to the ageing temperature, to simulate the effect of section size, are also reported and discussed in terms of the refinement in a precipitate size. It is shown that these refinements in precipitate size are reflected in higher values of the ratio 0.2% proof stress/Young's modulus.
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Bowen, A.W. Strength enhancement in a metastable β-titanium alloy: Ti-15Mo. J Mater Sci 12, 1355–1360 (1977). https://doi.org/10.1007/BF00540849
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DOI: https://doi.org/10.1007/BF00540849