The Effect of Heat Treatment on Microstructure and Mechanical Properties of FeCoNiAl_0.25Mn_0.75 High Entropy Alloy

Abstract:

The effect of heat treatment on the microstructure and mechanical properties of FeCoNiAl_0.25Mn_0.75 high-entropy alloy was investigated. In the as-cast sample, the dendritic microstructure was observed with the FCC lattice, according to XRD analysis. After annealing at 700 °C within 24 hours, the needle-shaped precipitated phase (BCC phase) in the form of clusters along the grain boundaries and in the FCC matrix phase occurs, the fraction of this phase increases significantly and the distribution becomes more uniform when the temperature is increased to 800 °C, the average size of this phase is only about 1-2 µm. However, as the temperature reaches 1000 °C, the BCC phase disappeared and the grain boundary is remelted and looks like cracks. At an annealing temperature below 800 °C, the HV3 hardness of the alloy increases and reaches its highest value of approximately 194 HV3. The yield and tensile strength can reach 373 and 762 MPa, respectively. However, these values decrease significantly when the annealing temperature reaches 1000 °C because of the plastic flow at near-boundary zones. The best relative elongation is 51.2 % at the as-cast state.

• Periodical: Materials Science Forum (Volume 1140)
• Pages: 3-11
• DOI: https://doi.org/10.4028/p-0GQx2z
• Online since: December 2024
• Authors: Le Minh Duc, Nguyen Hong Hai, Nguyen Van Duong, Nguyen Thanh Hung, Nguyen Kien Giang, Hoang Van Vuong, Pham Mai Khanh*
• Keywords: FeCoNiAl_0.25Mn_0.75 Alloy, Heat Treatment, High Entropy Alloy, Mechanical Properties, Microstructure

References

[1] Ming-Hung Tsai and Jien-Wei Yeh, High-Entropy Alloys: A Critical Review. Materials Research letters, 2014. 2: pp.107-123.

[2] George, E.P., D. Raabe, and R.O. Ritchie, High-entropy alloys. Nature Reviews Materials, 2019. 4(8): pp.515-534.

DOI: 10.1038/s41578-019-0121-4

[3] Li, Z., et al., Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys. Progress in Materials Science, 2019. 102: pp.296-345.

DOI: 10.1016/j.pmatsci.2018.12.003

[4] Zhou, Y., et al., Solid solution alloys of AlCoCrFeNiTix with excellent room-temperature mechanical properties. Applied Physics Letters, 2007. 90: pp.181904-181904.

DOI: 10.1063/1.2734517

[5] Senkov, O.N., et al., Mechanical properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 refractory high entropy alloys. Intermetallics, 2011. 19(5): pp.698-706.

DOI: 10.1016/j.intermet.2011.01.004

[6] Otto, F., et al., The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy. Acta Materialia, 2013. 61(15): pp.5743-5755.

DOI: 10.1016/j.actamat.2013.06.018

[7] Gludovatz, B., et al., A Fracture-Resistant High-Entropy Alloy for Cryogenic Applications. Science, 2014. 345: pp.1153-1158.

DOI: 10.1126/science.1254581

[8] Zhang, Y., et al., Microstructures and properties of high-entropy alloys. Progress in Materials Science, 2014. 61: pp.1-93.

[9] Lu, Z.P., et al., An assessment on the future development of high-entropy alloys: Summary from a recent workshop. Intermetallics, 2015. 66: pp.67-76.

DOI: 10.1016/j.intermet.2015.06.021

[10] Ye, Y.F., et al., High-entropy alloy: challenges and prospects. Materials Today, 2016. 19(6): pp.349-362.

[11] Yeh, J.W., et al., Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes. Advanced Engineering Materials, 2004. 6(5): pp.299-303.

DOI: 10.1002/adem.200300567

[12] Chen, M.-R., et al., Effect of vanadium addition on the microstructure, hardness, and wear resistance of Al0.5CoCrCuFeNi high-entropy alloy. Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science - METALL MATER TRANS A, 2006. 37: pp.1363-1369.

DOI: 10.1007/s11661-006-0081-3

[13] Wang, Y., B. Li, and H. Fu, Solid Solution or Intermetallics in a High‐Entropy Alloy. Advanced Engineering Materials, 2009. 11: pp.641-644.

DOI: 10.1002/adem.200900057

[14] Chou, Y.L., J.W. Yeh, and H.C. Shih, The effect of molybdenum on the corrosion behaviour of the high-entropy alloys Co1.5CrFeNi1.5Ti0.5Mox in aqueous environments. Corrosion Science, 2010. 52(8): pp.2571-2581.

DOI: 10.1016/j.corsci.2010.04.004

[15] Chuang, M.-H., et al., Microstructure and wear behavior of AlxCo1.5CrFeNi1.5Tiy high-entropy alloys. Acta Materialia, 2011. 59(16): pp.6308-6317.

DOI: 10.1016/j.actamat.2011.06.041

[16] Singh, S., et al., Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy. Acta Materialia, 2011. 59(1): pp.182-190.

DOI: 10.1016/j.actamat.2010.09.023

[17] Wang, W.-R., et al., Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys. Intermetallics, 2012. 26: pp.44-51.

DOI: 10.1016/j.intermet.2012.03.005

[18] Otto, F., et al., Relative effects of enthalpy and entropy on the phase stability of equiatomic high-entropy alloys. Acta Materialia, 2013. 61(7): pp.2628-2638.

DOI: 10.1016/j.actamat.2013.01.042

[19] Shaysultanov, D.G., et al., Phase Composition and Superplastic Behavior of a Wrought AlCoCrCuFeNi High-Entropy Alloy. JOM, 2013. 65.

DOI: 10.1007/s11837-013-0754-5

[20] Yeh, J.-W., Alloy Design Strategies and Future Trends in High-Entropy Alloys. JOM, 2013. 65.

DOI: 10.1007/s11837-013-0761-6

[21] He, J.Y., et al., Effects of Al addition on structural evolution and tensile properties of the FeCoNiCrMn high-entropy alloy system. Acta Materialia, 2014. 62: pp.105-113.

DOI: 10.1016/j.actamat.2013.09.037

[22] Salishchev, G.A., et al., Effect of Mn and V on structure and mechanical properties of high-entropy alloys based on CoCrFeNi system. Journal of Alloys and Compounds, 2014. 591: pp.11-21.

DOI: 10.1016/j.jallcom.2013.12.210

[23] Suryanarayana, C., Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials. Research (Wash D C), 2019. 2019: p.4219812.

DOI: 10.34133/2019/4219812

[24] Li, P., A. Wang, and C.T. Liu, Composition dependence of structure, physical and mechanical properties of FeCoNi(MnAl)x high entropy alloys. Intermetallics, 2017. 87: pp.21-26.

DOI: 10.1016/j.intermet.2017.04.007

[25] Bazioti, C., et al., Probing the structural evolution and its impact on magnetic properties of FeCoNi(AlMn)x high-entropy alloy at the nanoscale. Journal of Alloys and Compounds, 2022. 910: p.164724.

DOI: 10.1016/j.jallcom.2022.164724

[26] Hariharan, V.S., et al., Effect of Al addition and homogenization treatment on the magnetic properties of CoFeMnNi high-entropy alloy. Journal of Materials Science, 2020. 55: pp.1-14.

DOI: 10.1007/s10853-020-05171-8

[27] Li, Z., et al., Tuning phase constitution and magnetic properties by composition in FeCoNiAlMn high-entropy alloys. Journal of Alloys and Compounds, 2020. 845: p.156204.

DOI: 10.1016/j.jallcom.2020.156204

[28] Chen, C., et al., Effects of Al and Mn on microstructure, magnetic and mechanical properties of Fe40Co40Ni10M10 (M=Al, Mn) medium entropy alloys. Journal of Alloys and Compounds, 2022. 890: p.161779.

DOI: 10.1016/j.jallcom.2021.161779

[29] Yang, X. and Y. Zhang, Prediction of high-entropy stabilized solid-solution in multi-component alloys. Materials Chemistry and Physics, 2012. 132(2): pp.233-238.

DOI: 10.1016/j.matchemphys.2011.11.021

[30] Guo, S., et al., Effect of valence electron concentration on stability of fcc or bcc phase in high entropy alloys. Journal of Applied Physics, 2011. 109.

DOI: 10.1063/1.3587228

[31] Poletti, M.G., et al., Search for high entropy alloys in the X-NbTaTiZr systems (X=Al, Cr, V, Sn). Journal of Alloys and Compounds, 2015. 620: pp.283-288.

DOI: 10.1016/j.jallcom.2014.09.145