Abstract
The high strength-to-weight ratios and high elevated-temperature strength of dispersion strengthened titanium and titanium aluminides make them attractive materials for aerospace applications. A fine dispersion of hard particles is introduced into these alloys to increase their strength through an Orowan hardening mechanism. In addition to strengthening the material, dispersoids with whisker morphologies can produce toughening. Titanium alloys containing boride dispersions are currently being investigated at McDonnell Douglas Research Laboratories, and the microstructure of the dispersoids will be reported in this paper. Fine boride dispersions were produced in alloys with the compositions Ti-6B, Ti-25A1-4B and Ti-48A1-5B (at.%) using rapid solidification processing. The alloys were then annealed at ∼800°C/1 h, TEM specimens produced by electropolishing, and the structure of the borides examined in detail with a JEOL 2000FX TEM.
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