The effect of ageing on the microstructure and hardness of Al10Co25Cr8Fe15Ni36Ti6 high entropy alloys

Document Type : Original Article

Authors

• ebrahim yousefi ¹
• Masumeh Seifollahi ²
• seyed mahdi Abbasi ³

¹ Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology.

² Faculty of materials and manufacturing, malek ashtar university of technology

³ Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology

10.22067/jmme.2023.80793.1101

Abstract

The effect of ageing time and temperature on the microstructure and hardness of Al₁₀Co₂₅Cr₈Fe₁₅Ni₃₆Ti₆ high entropy alloys is investigated in this article. The alloy melted in vacuum induction melting furnace and purified using vaccum arc remelting process. Then homogenized at 1220°C for 17 hours. Then sample aged at 850, 900 and 950°C for 1-16 hours and assessed using XRD and SEM. The microstructure is involved ′γand NiAl precipitates and γ matrix. With increasing ageing temperature, the volume fraction and size of ′γ decreased from 60 Vol% and 338 nm at 850°C to 31 Vol% and 123 nm at 950°C, respectively. The ′γprimary morphology is cubic which changed to square and semi-square like. The hardness of alloy is 314, 329 and 327 Hv at 850, 900 and 950 °C, respectively. According to these results, 850°C for 8 hours is the best ageing conditions. The best high temperature tensile properties of 840.9 MPa ultimate tensile strength and 17.9 elongation obtained at 850 °C.

Keywords

• high entropy alloys
• Al10Co25Cr8Fe15Ni36Ti6
• gamma prime
• microstructure
• hardness

Main Subjects

• Advanced Materials

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References

[1] B.S. Murty and J.W.Yeh, High Entropy Alloys”, 1st ed. Elsevier, 2019. ‏

[2] Sh. Kumar, M. Mangish, S. Kumar, A. Sharma, B. Ahn, V. Kumar, “A review on High-Temperature Applicability: A milestone for high entropy alloys”, Engineering Science and Technology, an International Journal, vol. 35, pp. 101211, 2022.

[3] H. M. Daoud, A. M. Manzoni, N. Wanderka, U. Glatzel, “High-temperature tensile strength of Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy (high-entropy alloy)”, Journal of materials, vol. 67, pp. 2271-2277, 2015.

[4] J. Y. He, H. Wang, Y. Wu, X. J. Liu, H. H. Mao, T. G. Nieh, Z. P. Lu, “Precipitation behavior and its effects on tensile properties of FeCoNiCr high-entropy alloys”, Intermetallics, vol. 79, pp. 41-52, 2016.

[5] A. M. Manzoni, S. Haas, H. Daoud, U. Glatzel, C. Förster, N. Wanderka, “Tensile behavior and evolution of the phases in the Al10Co25Cr8Fe15Ni36Ti6 compositionally complex/high entropy alloy”, Entropy, vol. 20, pp. 646-665, 2018.‏

[6] L. Jiang, H. Jiang, Y. Lu, T. Wang, Z. Cao, T. Li, “Mechanical properties improvement of AlCrFeNi2Ti0. 5 high entropy alloy through annealing design and its relationship with its particle-reinforced microstructures”, Journal of Materials Science & Technology, vol. 31, pp. 397-402, 2015.

[7] A. Munitz, S. Salhov, G. Guttmann, N. Derimow, M. Nahmany, “Heat treatment influence on the microstructure and mechanical properties of AlCrFeNiTi0. 5 high entropy alloys”, Materials Science and Engineering: A, vol. 742, pp. 1-14, 2019.‏

[8] Q. Guo, X. Xu, X. Pei, Z. Duan, P. K. Liaw, H. Hou, Y. Zhao, “Predict the phase formation of high-entropy alloys by compositions”, Journal of Materials Research and Technology, vol. 22, pp. 3331-3339, 2022.

[9] A. Semenyuk, S. Zherebtsov, N. Stepanov, “The as-cast precipitation-strengthened N-doped Fe40Mn40Co10Cr10 high-entropy alloys”, Materials Letters, vol. 335, pp.133756, 2023.

[10] A. Munitz, S. Salhov, S. Hayun, N. Frage, “Heat treatment impacts the micro-structure and mechanical properties of AlCoCrFeNi high entropy alloy”, Journal of Alloys and Compounds,vol. 683, pp. 221-230, 2016.

[11] T.M. Butler, and M. L. Weaver, “Investigation of the phase stabilities in AlNiCoCrFe high entropy alloys”, Journal of Alloys and Compounds, vol. 691, pp. 119-129, 2017.

[12] J. Yuan, H. Zhang, Z. Wang, P. Han, J. Qiao, “Contribution of coherent precipitates on mechanical properties of CoCrFeNiTi0.2 high-entropy alloy at room and cryogenic temperatures”, Intermetallics,vol. 154, pp. 107820, 2023.

[13] L. Ma, J. Wang, Z. Lai, Z. Wu, B. Yang, P. Zhao, “Microstructure and mechanical property of Al56-xCo24Cr20Nix eutectic high-entropy alloys with an ordered FCC/BCT phase structure”, Journal of Alloys and Compounds, vol. 936, pp. 168194, 2023.

[14] X. Zeng, F. Li, X. Zhou, W. Yan, J. Li, D. Dongye Yang, Q. Shen, X. Wang, M. Liu, “The phase stability at intermediate-temperature and mechanical behavior of the dual-phase AlCoCr0.5FexNi2.5 high entropy alloys”, Materials Chemistry and Physics, vol. 297, pp. 127314, 2023.

[15] Q. Shen, D. Huang, F. Li, M. Liu, X. Wang, “Microstructures and mechanical properties of the precipitation strengthened Al0.4Cr0.7FexNi2V0.2 high entropy alloys”, Materials Science and Engineering: A, vol. 864, pp. 144606, 2023.

[16] M. Asgarkhani, M. Seifollahi, S. M. Abbasi, A. Akhondzadeh, “The effects of Homogenization on microstructure and mechanical properties of AlCoCrFeNi high entropy alloys”, 8th International Conference on Mechanical Engineering, Materials and Metallurg, Tehran, pp. October 7-8,  2019. (In Persian)

 [17] M. Asgarkhani, M. Seifollahi, S. M. Abbasi, “Effect of ageing on the microstructure and mechanical properties of Al0.7CoCrFeNi high entropy alloy”, International Journal of Engineering, vol. 36, pp. 1-7, 2023.

[18] A. M. Manzoni, S. Haas, J. M. Yu, H. M. Daoud, U. Glatzel, H. Aboulfadl, N. Wanderka, “Evolution of γ/γ'phases, their misfit and volume fractions in Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy”, Materials Characterization, vol. 154, pp. 363-376. 2019.

[19] T. K. Tsao, A. C. Yeh, C. M. Kuo, K. Kakehi, H. Murakami, J. W. Yeh, S. R. Jian, “The high temperature tensile and creep behaviors of high entropy superalloy”, Scientific reports, vol. 7, pp. 1-9, 2017.

[20] R. Völkl, U. Glatzel, M. Feller-Kniepmeier, “Measurement of the lattice misfit in the single crystal nickel based superalloys CMSX-4, SRR99 and SC16 by convergent beam electron diffraction”, Acta materialia, vol. 46, pp. 4395-4404, 1998.

[21] H. Biermann, M. Strehler, H. Mughrabi, “High-temperature measurements of lattice parameters and internal stresses of a creep-deformed monocrystalline nickel-base superalloy”, Metallurgical and Materials Transactions A, vol. 27, pp. 1003-1014, 1996.‏

[22] M. Shamsian, H. Arabi, M. A. Boutorabi, “Investigation of Morphology and Particle Size of γ' in Nickel Base Superalloy X-750 under Different Aging Temperatures”, Journal of Advanced Materials and Technologies, Vol.9, 43-51, 2020. In Persian

[23] A. Baldan, A. “Review progress in Ostwald ripening theories and their applications to nickel-base superalloys Part I: Ostwald ripening theories”, Journal of materials science, vol. 37, pp. 2171-2202, 2002.