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Nanomechanical Behavior of CoCrFeMnNi High-Entropy Alloy

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Abstract

The nanomechanical behavior of the Co20Cr20Fe20Mn20Ni20 high-entropy alloy was investigated in as-cast, rolled, annealed, and thin-film forms. Dislocation nucleation was studied by repeated indents at a low load for each of the different processing conditions. Distinct displacement bursts (pop in) were observed in the loading curve marked by incipient plasticity for all the samples. The as-cast and annealed samples showed pop ins for 100% of the indents, whereas the rolled and thin-film samples showed a much lower fraction of displacement bursts. This was explained by the high density of dislocations for the cold-worked and thin-film conditions. The strong depth dependence of hardness was explained by geometrically necessary dislocations. The nanomechanical behavior and twinned microstructure indicate low stacking-fault energy for this high-entropy alloy.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

    Sanghita Mridha, Santanu Das, Samir Aouadi, Sundeep Mukherjee & Rajiv S. Mishra

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  1. Sanghita Mridha
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  2. Santanu Das
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Correspondence to Sundeep Mukherjee.

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Mridha, S., Das, S., Aouadi, S. et al. Nanomechanical Behavior of CoCrFeMnNi High-Entropy Alloy. JOM 67, 2296–2302 (2015). https://doi.org/10.1007/s11837-015-1566-6

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