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Microstructure and mechanical properties of Ti-40 Wt Pct Ta (Ti-15 At. Pct Ta)

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Abstract

Of the β-isomorphous Ti-X alloy systems, Ti-Ta is one of the least studied. In the current work, the microstructure and mechanical properties of Ti-40 wt pct Ta (Ti-15 at. pct Ta) are investigated. Annealing at 810 °C produces a two-phase microstructure consisting of Ti-richa idiomorphs in a continuous Ta-rich β matrix; this suggests the β-transus temperature is higher than indicated by the most recently published phase diagram. Water quenching from 810 °C causes the β phase to partially transform to orthorhombic martensite (α), while furnace cooling yields secondarya The primary α formed isothermally remains unchanged in both cases. Subsequent aging causes transformation of the martensite to type 1a plus residual β, with a corresponding increase in strength and decrease in ductility. The maximum ductility (20 pct elongation) occurs in the water-quenched condition in which metastable β is retained. Analysis of the true stresstrue strain data suggests that transformation-induced plasticity may contribute to the enhanced ductility of the water-quenched material.

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Authors and Affiliations

  1. Los Alamos National Laboratory, 87545, Los Alamos, NM

    J. D. Cotton (Staff Member), J. F. Bingert (Staff Member), P. S. Dunn (Staff Member) & R. A. Patterson (Program Manager)

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  1. J. D. Cotton
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  2. J. F. Bingert
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  3. P. S. Dunn
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  4. R. A. Patterson
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Cotton, J.D., Bingert, J.F., Dunn, P.S. et al. Microstructure and mechanical properties of Ti-40 Wt Pct Ta (Ti-15 At. Pct Ta). Metall Mater Trans A 25, 461–472 (1994). https://doi.org/10.1007/BF02651588

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  • DOI: https://doi.org/10.1007/BF02651588

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