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Metal Science and Metallography
ArticleName Effect of electron beam treatment on the structure and properties of AlCoCrFeNi high-entropy alloy
DOI 10.17580/cisisr.2021.02.13
ArticleAuthor V. E. Gromov, Yu. F. Ivanov, S. V. Konovalov, K. A. Osintsev

Siberian State Industrial University, Novokuznetsk, Russia:

V. E. Gromov, Dr. Phys.-Math., Prof., Head of Dept. of Natural Sciences, e-mail:


Institute of High-Current Electronics SB RAS, Tomsk, Russia:
Yu. F. Ivanov, Dr. Phys.-Math., Prof., Chief Researcher, e-mail:


Samara National Research University, Samara, Russia:
S. V. Konovalov, Dr. Eng., Prof., Head of Dept. of Metals Technology and Aviation Materials, e-mail:
K. A. Osintsev, Post-Graduate Student, Dept. of Metals Technology and Aviation Materials, e-mail:


In the last decade the attention of scientists in the field of physical material science has been drawn to the study of high entropy alloys. Using wire arc additive manufacturing (WAAM) technology the high-entropy alloy (HEA) AlCoCrFeNi of nonequiatomic composition has been produced (wt. %: 15.64 Al; 7.78 Co; 8.87 Cr; 22.31 Fe; 44.57 Ni). It is shown by methods of modern material science that the HEA is a polycrystalline material with a grain size 4–15 μm along whose grain boundaries the second-phase particles are detected. It is shown by the mapping methods that bulks of grains are enriched in aluminium and nickel while grain boundaries contain chromium and iron. Cobalt is quasi-uniformly distributed in crystal lattice of the manufactured HEA. The material ultimate strength in testing for compression depends on production mode and varies within the interval from 1300 to 1800 MPa. The HEA wear parameter amounts to 1.4∙10−4 mm3/N⋅m, friction coefficient — 0.65. In testings for tension the material failure occurred by the mechanism of intragrain cleavage. The formation of brittle cracks along boundaries and in grain boundary junctions i.e. in sites containing the inclusions of second phases is revealed. One of the reasons of HEA increased brittleness is the revealed nonuniform distribution of elements in alloy structure. The HEA’s irradiation by pulsed electron beam with energy density of 10–30 J/cm2 (pulse duration 200 μs, number of pulses 3) results in material homogenization. High-velocity crystallization of molten surface layer of HEA samples is accompanied by the formation of columnar structure having a submicro-nanocrystalline structure. The HEA irradiation results in the increase in hardness and plasticity of the material. The largest increase (1.6 times) in ultimate strength is obtained in the alloy after electron beam processing with energy density of 30 J/cm2. Electron beam processing leads to decrease in microhardness of alloy surface layer up to 90 μm thick.

The research was supported by Russian Research Foundation grant (RSF) (project № 20-19-00452).

keywords Wire-arc additive manufacturing, high-entropy alloy, AlCoCrFeNi, structure, properties, atom distribution, friction coefficient, electron-beam treatment

1. George E. P., Curtin W. A., Tasan C. C. High entropy alloys: A focused review of mechanical properties and deformation mechanisms. Acta Materialia. 2020. Vol. 188. pp. 435–474.
2. Shivam V., Basu J., Pandey V. K., Shadangi Y., Mukhopadhyay N. K. Alloying behaviour, thermal stability and phase evolution in quinary AlCoCrFeNi high entropy alloy. Advanced Powder Technology. 2018. Vol. 29. pp. 2221–2230.
3. Ganesh U. L., Raghavendra H. Review on the transition from conventional to multi-component-based nano-high-entropy alloys-NHEAs. Journal of Thermal Analysis and Calorimetry. 2020. Vol. 139. pp. 207–216.
4. Alshataif Y. A., Sivasankaran S., Al-Mufadi F. A., Alaboodi A. S., Ammar H. R. Manufacturing methods, microstructural and mechanical properties evolutions of high-entropy alloy: a review. Metals and Materials International. 2019. Vol. 26. pp. 1099–1133.
5. Cheng K. C., Chen J. H., Stadler S., Chen S. H. Properties of atomized AlCoCrFeNi high-entropy alloy powders and their phase-adjustable coatings prepared via plasma spray process. Applied Surface Science. 2019. Vol. 478. pp. 478–486.
6. Joseph J., Hodgson P., Jarvis T., Wu X., Stanford N., Fabijanic D. M. Effect of hot isostatic pressing on the microstructure and mechanical properties of additive manufactured AlxCoCrFeNi high entropy alloys. Materials Science and Engineering A. 2018. Vol. 733. pp. 59–70.
7. Jian R., Wang L., Zhou S., Zhu Y., Liang Y.J., Wang B., Xue Y. Achieving fine-grain tungsten heavy alloys by selecting a high entropy alloy matrix with low W grain growth rate. Materials Letters. 2020. Vol. 278. p. 128405.
8. Hou L., Hui J., Yao Y., Chen J., Liu J. Effects of Boron Content on microstructure and mechanical properties of AlFeCoNiBx High Entropy Alloy Prepared by vacuum arc melting. Vacuum. 2019. Vol. 164. pp. 212–218.
9. Wu H., Huang S., Zhao C., Zhu H., Xie Z., Tu C., Li X. Microstructures and mechanical properties of in-situ FeCrNiCu high entropy alloy matrix composites reinforced with NbC particles. Intermetallics. 2020. Vol. 127. Pp. 106983.
10. Xu Y., Li C., Huang Z., Chen Y., Zhu L. Microstructure evolution and mechanical properties of FeCoCrNiCuTi0.8 high-entropy alloy prepared by directional solidification. Entropy. 2020. Vol. 22. pp. 1–12.
11. Miracle D. B., Senkov O. N. A critical review of high entropy alloys and related concepts. Acta Materialia. 2017. Vol. 122. pp. 448–511.
12. Zhang W., Liaw P. K., Zhang Y. Science and technology in highentropy alloys. Science China Materials. 2018. Vol. 61. No. 1. pp. 2–22.
13. Osintsev K. A., Gromov V. E., Konovalov S. V., Ivanov Yu. F., Panchenko I. A. HEA: structure, mechanical properties, mechanisms of deformation and application. Izvestiya. Ferrous Metallurgy. 2021. No. 4. pp. 1–10.
14. Rogachev A. S. Structure, stability and properties of high-entropy alloys. Physics of metals and materials science. 2020. Vol. 121. No. 8. pp. 807–841.
15. Ivanov Yu. F., Gromov V. Е., Zagulyaev D. V., Konovalov S. V., Rubannikova Yu. A., Semin A. P. Prospects for the application of surface treatment of alloys by electron beams in state-of-the-art technologies. Progress in Physics of Metals. 2020. Vol. 21. No. 3. pp. 345–362.
16. Gromov V. E., Ivanov Yu. F., Vorobiev S. E., Konovalov S. V. Fatigue of steels modified by high intensity electron beams. Cambridge, 2015. 272 p.
17. Osintsev K. A., Konovalov S. V., Glezer A. M., Gromov V. E., Ivanov Yu. F., Panchenko I. A., Sundeev R. V. Research on the structure of Al2.1Co0.3Cr0.5FeNi2.1 high-entropy alloy at submicro-and nano-scale levels. Materials Letters. 2021. Vol. 294. p. 129717.

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