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Deformation structure in a Ti-24Al-11Nb alloy

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Abstract

A Ti-24Al-11Nb alloy has been heat-treated so as to obtain a microstructure of coarse α2 particles (D019 structure based on Ti3Al) in a matrix of the ordered βo phase (B2 structure based on Ti2AlNb). Dislocation structures generated by tensile strains of ∼2 pct at room temperature have been analyzed by transmission electron microscopy The βo phase is shown to deform inhomogeneously on {110}, {112}, and {123} planes by α/〈211〉 slip. The slipband structure is complex, consisting of segments of heavily pinned edge dislocations with periodic cross slip of screw components on to secondary slip planes. Incompatibility stresses at α2/βo interfaces can generate fine α[100] slip as well. The α2 phase deforms independently by α dislocation slip. Slipbands in the βo phase can shear the α2 phase by activatingc +a/2 slip on\(\left\{ {2\overline 2 01} \right\}\) and\(\left\{ {22\overline 4 2} \right\}\) slip planes, as well asa slip on higher order pyramidal planes, where the parallelism of the specific slip system is permitted by the Burgers relationship between the two phases.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Kanchanbagh P.O., 500 258, Hyderabad, India

    D. Banerjee (Scientist), A. K. Gogia (Scientist) & T. K. Nandy (Scientist)

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  1. D. Banerjee
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  2. A. K. Gogia
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  3. T. K. Nandy
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Banerjee, D., Gogia, A.K. & Nandy, T.K. Deformation structure in a Ti-24Al-11Nb alloy. Metall Trans A 21, 627–639 (1990). https://doi.org/10.1007/BF02671934

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