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The influence of microstructure on mechanical properties in Ti-3AI-8V-6Cr-4Mo-4Zr (Beta-C)

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Abstract

The effect of microstructure on mechanical properties of a metastable beta titanium alloy has been investigated, with emphasis on the influence of α-phase precipitation on tensile strength and ductility. A commercial alloy, Ti-3Al-8V-6Cr-4Mo-4Zr (Beta-C) has been aged to produce both Type la (obeying the Burgers orientation relation) and Type 2α (not obeying the Burgers relation) as hardening precipitates in the beta matrix. Although a direct comparison of Types 1 and 2α could not be made, there did not seem to be any direct correlation between precipitate type and mechanical properties. Rather, it has been found that overaging to produce a coarse distribution of relatively large (>1000Å) noncoherent α precipitates provides the best combination of strength and duc-tility. The same strength can be achieved with a much finer distribution of small (∼100-200A) coherent α precipitates, but with much reduced ductility.

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Authors and Affiliations

  1. Structural Materials Department, Science Center, Rockwell International, 91360, Thousand Oaks, CA

    C. G. Rhodes (Member Technical Staff) & N. E. Paton (Associate Director)

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  1. C. G. Rhodes
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  2. N. E. Paton
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Rhodes, C.G., Paton, N.E. The influence of microstructure on mechanical properties in Ti-3AI-8V-6Cr-4Mo-4Zr (Beta-C). Metall Trans A 8, 1749–1761 (1977). https://doi.org/10.1007/BF02646879

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