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Mechanism of high-pressure torsion-induced shear banding and lamellar thickness saturation in Co–Cr–Fe–Ni–Nb high-entropy composites

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Abstract

High-entropy composites (HECs) were subjected to severe straining by high-pressure torsion (HPT) to evaluate their influence on the evolution of microstructure and deformation behavior. Severe straining leads to a homogeneously strained microstructure and inhomogeneous micro-shear bands in these HECs. Nb addition in HECs varies the microstructure from single phase to eutectic, and the Vickers microhardness in HPT HECs increases to 7.45 GPa. Nb addition up to x = 0.80 in as-cast HECs improves the strength of these materials at the expense of its plasticity. Nevertheless, severe straining provides a better combination of strength and ductility without sacrificing its plasticity. Such improvement in properties is attributed to the evolved microstructural features, formation of “transformation-shear bands (T-SBs)” and “deformation-shear bands (D-SBs)” at severe straining. This assures the homogeneous deformation by shear banding and suggests that shear banding is the dominant deformation mechanism when the lamellar spacing becomes saturated upon severe straining.

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Acknowledgments

The authors would like to thank Prof. R. Pippan, T. Hohenwarter, P. Kutlesa, and S. Modritsch for their help with high-pressure torsion experiments and metallographic sample preparation, respectively. Financial support was provided through the European Research Council under the ERC Advanced Grant INTELHYB (grant ERC-2013-ADG-340025) and Estonian Research Council under the structural funds MOBERC15.

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Authors and Affiliations

  1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, 8700, Austria

    Tapabrata Maity, Konda Gokuldoss Prashanth, Jeong Tae Kim & Jürgen Eckert

  2. Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Tallinn, 19086, Estonia

    Konda Gokuldoss Prashanth

  3. Department Materials Physics, Montanuniversitat Leoben, Leoben, 8700, Austria

    Tapabrata Maity, Alexander Janda, Florian Spieckermann & Jürgen Eckert

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  1. Tapabrata Maity
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Correspondence to Konda Gokuldoss Prashanth.

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Maity, T., Prashanth, K.G., Janda, A. et al. Mechanism of high-pressure torsion-induced shear banding and lamellar thickness saturation in Co–Cr–Fe–Ni–Nb high-entropy composites. Journal of Materials Research 34, 2672–2682 (2019). https://doi.org/10.1557/jmr.2019.149

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