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Mechanical Behavior of W-Y2O3 and W-Ti Alloys from 25 °C to 1000 °C

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Abstract

The mechanical behavior of pure W, W-0.5 wt pct Y2O3, and W-4 wt pct Ti manufactured by powder metallurgy was studied from ambient temperature to 1000 °C. Y2O3 nanoparticles were added to inhibit grain growth and improve oxidation resistance, while Ti is a sintering activator. Strength and toughness were measured from the three-point bend tests in smooth and notched prismatic bars. The dominant deformation and failure micromechanisms were assessed as a function of temperature for each material through the analysis of the fracture surfaces and transverse cross sections in the scanning electron microscope. In particular, the role played by microstructure, dominant failure mechanisms, and oxidation rates in mechanical behavior were elucidated for each material in the entire temperature range. It was found that Y2O3 improved the high-temperature properties by inhibiting oxidation. The Ti acted as a sintering activator, and the W-Ti alloy was fully dense and presented smaller grain size. Both factors enhanced the mechanical properties at ambient and intermediate temperatures, but the ductile-to-brittle transition temperature (DBTT) of this material was higher, leading to brittle behavior up to very high temperature.

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Acknowledgments

This investigation was supported by the EURATOM/CIEMAT association through Contract No. TW6-TTMA-002-EFDA, by the Comunidad de Madrid (Program No. ESTRUMAT-CM S0505/MAT/0077), and by the Spanish Ministry of Science and Innovation (Grant Nos. CSD00C-06-14102, MAT2006-13005-C03-02, and MAT2007-29278-E).

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Authors and Affiliations

  1. Departamento de Tecnologías Especiales Aplicadas a la Aeronáutica, Universidad Politécnica de Madrid, E.U.T. de Aeronáutica, 28040, Madrid, Spain

    M. V. Aguirre (Associate Professor)

  2. Departamento de Ciencia de Materiales, Universidad Politécnica de Madrid, E.T.S. de Ingenieros de Caminos, 28040, Madrid, Spain

    A. Martín (Professor), J. Y. Pastor (Professor) & J. Llorca (Professor, Director)

  3. Instituto Madrileño de Estudios Avanzados en Materiales (IMDEA-materiales), E.T.S. de Ingenieros de Caminos, Madrid, Spain

    J. Llorca (Professor, Director)

  4. Departmento de Física, Universidad Carlos III de Madrid, 28911, Leganés, Spain

    M. A. Monge (Associate Professor) & R. Pareja (Professor)

Authors
  1. M. V. Aguirre
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  2. A. Martín
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  3. J. Y. Pastor
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  4. J. Llorca
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  5. M. A. Monge
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  6. R. Pareja
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Corresponding author

Correspondence to J. Llorca.

Additional information

Manuscript submitted March 24, 2009.

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Aguirre, M.V., Martín, A., Pastor, J.Y. et al. Mechanical Behavior of W-Y2O3 and W-Ti Alloys from 25 °C to 1000 °C. Metall Mater Trans A 40, 2283–2290 (2009). https://doi.org/10.1007/s11661-009-9956-4

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  • DOI: https://doi.org/10.1007/s11661-009-9956-4

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