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Avoiding cracks and inhomogeneities in billets processed by ECAP

  • Ultrafine Grained Materials
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Abstract

Although equal-channel angular pressing (ECAP) is now an established technique for producing bulk ultrafine-grained metallic materials, processing difficulties may arise because of the occurrence of cracking or inhomogeneities. This problem is examined with reference to experimental data for aluminum and magnesium alloys and a Pb–Sb alloy. It is shown that effective procedures are available for avoiding the development of inhomogeneities and the cracking of billets during ECAP: these procedures include introducing a pre-deformation of the as-cast material prior to ECAP, decreasing the strain produced in each ECAP pass by using dies with angles higher than 90°, and controlling the rotation of the billets between sequential passes.

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Acknowledgements

This study was supported by the National Science Foundation of the United States under Grant No. DMR-0855009. PRC and MTPA are grateful for the financial support of CNPq (Brazilian National Research Council), CAPES (Post-Graduate Commission of the Education Ministry of Brazil), and FAPEMIG (Foundation for the Support of Research in Minas Gerais State).

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, School of Engineering, Federal University of Minas Gerais, Belo Horizonte, MG, 30160-030, Brazil

    Paulo R. Cetlin & Roberto B. Figueiredo

  2. Department of Materials Engineering and Construction, School of Engineering, Federal University of Minas Gerais, Belo Horizonte, MG, 30160-030, Brazil

    Maria Teresa P. Aguilar

  3. Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, UK

    Roberto B. Figueiredo & Terence G. Langdon

  4. Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA

    Terence G. Langdon

Authors
  1. Paulo R. Cetlin
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  2. Maria Teresa P. Aguilar
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  3. Roberto B. Figueiredo
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  4. Terence G. Langdon
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Correspondence to Paulo R. Cetlin.

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Cetlin, P.R., Aguilar, M.T.P., Figueiredo, R.B. et al. Avoiding cracks and inhomogeneities in billets processed by ECAP. J Mater Sci 45, 4561–4570 (2010). https://doi.org/10.1007/s10853-010-4384-9

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  • DOI: https://doi.org/10.1007/s10853-010-4384-9

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