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Mechanical Properties and Microstructure of the CoCrFeMnNi High Entropy Alloy Under High Strain Rate Compression

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Abstract

The equiatomic CoCrFeMnNi high entropy alloy, which crystallizes in the face-centered cubic (FCC) crystal structure, was prepared by the spark plasma sintering technique. Dynamic compressive tests of the CoCrFeMnNi high entropy alloy were deformed at varying strain rates ranging from 1 × 103 to 3 × 103 s−1 using a split-Hopkinson pressure bar (SHPB) system. The dynamic yield strength of the CoCrFeMnNi high entropy alloy increases with increasing strain rate. The Zerilli-Armstrong (Z-A) plastic model was applied to model the dynamic flow behavior of the CoCrFeMnNi high entropy alloy, and the constitutive relationship was obtained. Serration behavior during plastic deformation was observed in the stress-strain curves. The mechanism for serration behavior of the alloy deformed at high strain rate is proposed.

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Acknowledgments

This work was financially supported by State Key Laboratory of Powder Metallurgy, Central South University (No. 621020016), and by the Freedom Explore Program of Central South University (No. 2015zzts175). The authors would like to express their sincere thanks to Professor Marc. A. Meyers at University of California, San Diego, and Professor Yang Wang and Yu Wang at University of Science and Technology of China and for good suggestions and experimental works.

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Authors and Affiliations

  1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha, People’s Republic of China

    Bingfeng Wang, Bin Liu & Yong Liu

  2. School of Materials Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Bingfeng Wang, Ao Fu & Xiaoxia Huang

  3. Key Lab of Nonferrous Materials, Ministry of Education, Central South University, Changsha, 410083, People’s Republic of China

    Bingfeng Wang, Bin Liu & Yong Liu

  4. Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA, 92093, USA

    Zezhou Li

  5. School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, People’s Republic of China

    Xiang Zan

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  1. Bingfeng Wang
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  2. Ao Fu
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  3. Xiaoxia Huang
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  4. Bin Liu
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Correspondence to Bingfeng Wang.

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Wang, B., Fu, A., Huang, X. et al. Mechanical Properties and Microstructure of the CoCrFeMnNi High Entropy Alloy Under High Strain Rate Compression. J. of Materi Eng and Perform 25, 2985–2992 (2016). https://doi.org/10.1007/s11665-016-2105-5

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  • DOI: https://doi.org/10.1007/s11665-016-2105-5

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