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A comparison study of microstructure and mechanical properties of Ti-24Al-14Nb-3V-0.5Mo with and without Si

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Abstract

A comparative study has been made of the room- and elevated-temperature properties, room-temperature fracture toughness, fatigue-crack propagation rates, and 650 °C creep properties of Ti-24Al-14Nb-3V-0.5Mo with and without 0.9 at. pct Si. Both alloys have microstructures consisting of the α 2, B2, and the orthorhombic O phase, with different proportions of the α 2 phase relative to the (O + B2) mixtures, depending on solution-treatment temperature. The alloy with a Si addition contains additional primary ζ-Ti5Si3 particles distributed in the (O + B2) matrix. Tests of mechanical properties showed that the incorporation of a small fraction (about 0.03 by volume) of the Ti5Si3 phase leads to greater room-temperature and elevated-temperature strengths, but lower room-temperature elongations and fracture toughness as compared with the base alloy. Alloys containing greater volume fractions of the α 2 phase exhibited better tensile ductility, and this was attributed to the concurrent stabilization of the B2 phase. Examination of tensile-tested and fatigued specimens indicates that the primary failure mode of the alloys, regardless of Si addition, was due to the brittleness of the α 2 phase; the silicide particles that debonded from the matrix also contribute to cracking in the monotonic loading mode. Up to a 20 pct improvement in creep-rupture life was observed in the Si-containing alloys, and this was interpreted in terms of the solute-strengthening effect of Si. While the incorporated Ti5Si3 phase has an unfavorable effect on ductility and room-temperature fracture toughness, the difference in fatigue-crack propagation rates between the alloys with and without Si is minimal. It is concluded that the controlling factor for the fatigue failure in orthorhombic alloys is related to the (α 2 + O + B2) microstructure, instead of the Ti5Si3 particles.

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Authors and Affiliations

  1. the Titanium Alloy Laboratory, Institute of Metal Research, Chinese Academy of Sciences, 110015, Shenyang, People’s Republic of China

    B. Lu (Postdoctoral Student), R. Yang (Professor and Head of Laboratory), Y. Y. Cui (Associate Professor) & D. Li (Professor Emeritus)

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  1. B. Lu
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  2. R. Yang
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  3. Y. Y. Cui
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  4. D. Li
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Lu, B., Yang, R., Cui, Y.Y. et al. A comparison study of microstructure and mechanical properties of Ti-24Al-14Nb-3V-0.5Mo with and without Si. Metall Mater Trans A 31, 2205–2217 (2000). https://doi.org/10.1007/s11661-000-0138-7

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  • DOI: https://doi.org/10.1007/s11661-000-0138-7

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