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Metals 2019, 9(2), 263; https://doi.org/10.3390/met9020263

Activation Volume and Energy for Dislocation Nucleation in Multi-Principal Element Alloys

Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA
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Received: 25 January 2019 / Revised: 19 February 2019 / Accepted: 21 February 2019 / Published: 23 February 2019
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Abstract

Incipient plasticity in multi-principal element alloys, CoCrNi, CoCrFeMnNi, and Al0.1CoCrFeNi was evaluated by nano-indentation and compared with pure Ni. The tests were performed at a loading rate of 70 μN/s in the temperature range of 298 K to 473 K. The activation energy and activation volume were determined using a statistical approach of analyzing the “pop-in” load marking incipient plasticity. The CoCrFeMnNi and Al0.1CoCrFeNi multi-principal element alloys showed two times higher activation volume and energy compared to CoCrNi and pure Ni, suggesting complex cooperative motion of atoms for deformation in the five component systems. The small calculated values of activation energy and activation volume indicate heterogeneous dislocation nucleation at point defects like vacancy and hot-spot. View Full-Text
Keywords: multi-principal element alloys; dislocation nucleation; activation volume; activation energy; nano-indentation; high/medium entropy alloys multi-principal element alloys; dislocation nucleation; activation volume; activation energy; nano-indentation; high/medium entropy alloys
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mridha, S.; Sadeghilaridjani, M.; Mukherjee, S. Activation Volume and Energy for Dislocation Nucleation in Multi-Principal Element Alloys. Metals 2019, 9, 263.

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