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Inhomogeneity Through Warm Equal Channel Angular Pressing

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Abstract

In this study, the hardness inhomogeneity of billets during multi-passes of equal channel angular pressing (ECAP) at elevated temperatures is investigated and the effect of large strain deformation during ECAP on the hardness inhomogeneity characteristics due to dynamic aging of aluminum 6061 under a variety of temperatures and ram speed was studied by TEM and hardness measurements. The hardness results showed that the hardness distribution is more homogenous after four passes using the pressing route Bc. However, when the deformation temperature was considered, performing ECAP at 100 °C may provide the most homogeneous microstructure after multi-pressing as long as the total number of pressing passes is four. This indicates that a lower temperature (in the range of warm working) is favorable for achieving an ultrafine-grained/nanomaterial with a more homogenous microstructure. In order to quantify the inhomogeneity in the cross section of the as-pressed sample, an inhomogeneity index has been defined. The results show an increase in the hardness in the first pass with significant inhomogeneous deformation and a transition toward a more homogeneous structure with subsequent passes.

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Acknowledgments

MV and AKT would like to thank the Sharif University of Technology and the Iran National Science Foundation (INSF) for the provision of research facilities and financial support of this work. HSK acknowledges the support by a grant from the Fundamental R&D Program for Core Technology of Materials (100372751-55551) funded by the Ministry of Knowledge Economy, Korea.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Hamedan University of Technology, 65155-579, Hamedan, Iran

    Majid Vaseghi & Amir Momeni

  2. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Majid Vaseghi & Hyoung Seop Kim

  3. Department of Materials Science and Engineering, Sharif University of Technology, 11155-9466, Tehran, Iran

    Ali Karimi Taheri

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  1. Majid Vaseghi
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  2. Hyoung Seop Kim
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  4. Amir Momeni
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Correspondence to Majid Vaseghi.

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Vaseghi, M., Kim, H.S., Karimi Taheri, A. et al. Inhomogeneity Through Warm Equal Channel Angular Pressing. J. of Materi Eng and Perform 22, 1666–1671 (2013). https://doi.org/10.1007/s11665-012-0436-4

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  • DOI: https://doi.org/10.1007/s11665-012-0436-4

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