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Differential superplasticity in a multi-phase multi-principal element alloy by initial annealing

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Abstract

Multi-phase structure alloys have been widely used in superplasticity deformation due to their ability to inhibit grain growth. However, the current study on multi-phase structure alloys has mainly indicated static grain growth than dynamic grain growth. Dynamic grain growth plays an important role in superplastic deformation because it leads to strain hardening, limiting superplastic elongation. In this research, the Al0.5CoCrFeMnNi high-entropy alloy (HEA) was annealed at 1473 K for 2 h to form a single-phase FCC microstructure, then subjected to high-pressure torsion (HPT) for grain refinement. This HEA achieved high-strain rate superplasticity with an impressive elongation of 1100% under a temperature of 1073 K at a strain rate of 10–1 s−1. Comparing the results of the present study with a previous work published on the same HEA reveals the impact of initial annealing on the superplastic response. It is suggested that the initial B2, formed during the annealing stage before the HPT process, effectually limits the dynamic grain growth, resulting in remarkably enhanced superplasticity. This investigation introduces the new microstructural evolution to uplift superplasticity in multi-phase structures with dynamic grain growth elimination.

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The data supporting this study's findings are available from the corresponding author upon reasonable request.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (NRF-2022R1A5A1030054). The authors acknowledge the technical support from Professor Chong Soo Lee, Mr. Geon Hyeong Kim, and Mr. Gyeong Hyeon Jang from Materials Reliability Laboratory, Graduate Institute of Ferrous & Energy Materials Technology (GIFT), Pohang University of Science and Technology, Pohang, South Korea.

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  1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea

    Nhung Thi-Cam Nguyen, Peyman Asghari-Rad, Hyojin Park & Hyoung Seop Kim

  2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea

    Hyoung Seop Kim

  3. Institute for Convergence Research and Education in Advanced Technology, Yonsei University, Seoul, 03722, South Korea

    Hyoung Seop Kim

  4. Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, 980-8577, Japan

    Hyoung Seop Kim

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Nguyen, N.TC., Asghari-Rad, P., Park, H. et al. Differential superplasticity in a multi-phase multi-principal element alloy by initial annealing. J Mater Sci 57, 18154–18167 (2022). https://doi.org/10.1007/s10853-022-07616-8

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