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Analysis of microstructure and microhardness of Zr-2.5Nb processed by High-Pressure Torsion (HPT)

  • Ultrafine Grained Materials
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Abstract

Nanostructured materials have been widely studied due to the improvement of their mechanical properties comparing to those of coarse grain materials. The present work intended to analyze the microstructure and microhardness of Zr-2.5Nb processed by high-pressure torsion (HPT), one of the severe plastic deformation techniques. The deformations were carried out at room temperature using a pressure of 5 GPa and 5 anvil turns. Vickers indentation was used to evaluate the microhardness of the samples. Transmission electron microscopy and X-ray diffraction were used to analyze the microstructure. The results showed a significant refinement from the initial microstructure achieving nanometric grain size around 50 nm and phase transformation α → ω + βI induced by shear. The Vickers microhardness values of the material submitted to HPT technique were significantly higher than those of non-deformed material. Also, HPT procedure resulted in a huge grain refinement of the material and in phase transformation.

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Acknowledgements

This research was supported by CNPq (Brazil) and we thank Profs. D.S. Silva and L.H. de Almeida from Universidade Federal do Rio de Janeiro (UFRJ) for providing the research material, and Prof. W. Botta from Universidade Federal de São Carlos (UFSCar), and also Prof. Ramirez from Laboratorio Nacional de Luz Síncronton (LNNano), Prof. E. Radovanovic, and C. Nakamura from Universidade Estadual de Maringá (UEM) and J. Buarque and R. M. Santana from Centro de Pesquisas da Eletrobras (CEPEL) for access to laboratory facilities. The electron microscopy work has been performed using JSM 6490-LV and JEM 2100F microscopes from LabNano/CBPF, Rio de Janeiro.

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Authors and Affiliations

  1. Instituto Militar de Engenharia (IME), Praça General Tibúrcio, 80, Urca, Rio de Janeiro, RJ, 22290-270, Brazil

    Mychelle Vianna Pereira Companhoni, Jose Ricardo Gomes Matheus & Andre Luiz Pinto

  2. Centro Brasileiro de Pesquisas Físicas (CBPF), Rua Xavier Sigaud, 150, Urca, Rio de Janeiro, RJ, 22290-180, Brazil

    Tatiana Lisboa Marcondes & Andre Luiz Pinto

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  1. Mychelle Vianna Pereira Companhoni
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  2. Jose Ricardo Gomes Matheus
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  3. Tatiana Lisboa Marcondes
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  4. Andre Luiz Pinto
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Correspondence to Andre Luiz Pinto.

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Companhoni, M.V.P., Matheus, J.R.G., Marcondes, T.L. et al. Analysis of microstructure and microhardness of Zr-2.5Nb processed by High-Pressure Torsion (HPT). J Mater Sci 47, 7835–7840 (2012). https://doi.org/10.1007/s10853-012-6454-7

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  • DOI: https://doi.org/10.1007/s10853-012-6454-7

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