Abstract
The effect of the precipitation of the metastable ω phase on the tensile properties of β-phase titanium alloys has been studied. The volume fraction of ω phase was varied by controlling the heat treatment temperature and the alloy content. It is shown that provided the volume of ω phase is less than 0.6, significant increases in yield strength can be obtained while retaining reasonable ductility. Higher volume fractions results in complete macroscopic embrittlement, but fracture still occurs by microvoid coalescence. Thin film microscopy of deformed samples shows that dislocations bypass the omega particles. The results are discussed in relation to current theories of deformation and fracture of two-phase alloys.
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B. S. HICKMAN, formerly with North American Rockwell Science Center.
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Williams, J.C., Hickman, B.S. & Marcus, H.L. The effect of omega phase on the mechanical properties of titanium alloys. Metall Trans 2, 1913–1919 (1971). https://doi.org/10.1007/BF02913423
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DOI: https://doi.org/10.1007/BF02913423