Microstructure and Properties of Multi-Component Al_xCoCrFeNiTi_0.5 High-Entropy Alloys

Abstract:

The multi-component AlxCoCrFeNiTi0.5 (x=0, 0.2, 0.5, 0.8, 1.0) high-entropy alloys were prepared by vacuum arc melting. The microstructure and mechanical properties were studied. It was found that the structure transformed from FCC into FCC + BCC + Laves, and finally into BCC with the increase of Al content. The compress test results showed that with the addition of aluminium from 0 to 1.0, the fraction strength increased while plasticity reduced. In the stain rates of 5×10^-3/s and 1×10^-3/s, when x=0.8 the fraction strength achieved maximum and x=0 the plastic was best, the strength of 2879MPa and 2433MPa, the strain of 0.21 and 0.22, respectively. The hardness increased obviously (from Hv479.1 to Hv692.7) when Bcc phase and Laves phase appeared. The analysis revealed that the strengthen mechanism was mainly composed of solid solution strengthening and precipitation strengthening.

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 775-780
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.775
• Online since: February 2013
• Authors: Yong Dong, Yi Ping Lu, Jun Jia Zhang, Ting Ju Li
• Keywords: Fracture Strength, High Entropy Alloy, Microstructure, Multi-Component, Solid Solution

References

[1] T. M. Wang, Z.N. Chen, H.W. Fu, J. Xu, Y. Fu and T.J. Li, Grain refining potency of Al-B master alloy on pure aluminum, Scr Mater. 64 (2011) 1121-1124.

DOI: 10.1016/j.scriptamat.2011.03.001

[2] R.D. Noebe, R.R. Bowman, M.V. Nathal, Physical and Mechanical-properties of the B2 Compound NiAl, Int Mater Rev. 38-4 (1993) 193.

DOI: 10.1179/imr.1993.38.4.193

[3] K.H. Huang: Master's Thesis, National Tsing Hua University, Hsinchu, Taiwan, June (1996).

[4] J.W. Yeh, S.K. Chen, S.J. Lin, J.Y. Gan, T.S. Chin, T.T. Shun, et al. Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes, Adv Eng Mater. 31-6 (2004) 299-303.

DOI: 10.1002/adem.200300567

[5] Y.J. Zhou, Y. Zhang, Y.L. Wang and G.L. Chen, Solid solution alloys of AlCoCrFeNiTix with excellent room-temperature mechanical properties, Appl Phys Lett. 90 (2007) 181904.

DOI: 10.1063/1.2734517

[6] A.V. Kuznetsov, D.G. Shaysultanov, N.D. Stepanov, G.A. Salishchev, O.N. Senkov, Tensile properties of an AlCrCuNiFeCo high-entropy alloy in as-cast and wrought conditions, Mater Sci Eng A. 533 (2012) 107-118.

DOI: 10.1016/j.msea.2011.11.045

[7] M.H. Chuang, M.H. Tsai, W.R. Wang, S.J. Lin, J.W. Yeh. Microstructure and wear behavior of AlxCo1. 5CrFeNi1. 5Tiy high-entropy alloys, Acta Mater. 59 (2011) 6308-6317.

DOI: 10.1016/j.actamat.2011.06.041

[8] B. Ren, Z.X. Liu, D.M. Li, L. Shi, B. Cai and M. X. Wang. Corrosion behavior of CuCrFeNiMn high entropy alloy system in 1 M sulfuric acid solution, Mater Corros. 62 (2011) 9999.

DOI: 10.1002/maco.201106072

[9] C.J. Tong, M.R. Chen, S.K. Chen, J.W. Yeh, T.T. Shun, S.J. Lin, et al., Mechanical Performance of the AlxCoCrCuFeNi High-Entropy Alloy System with Multiprincipal Elements, Metall Mater Trans A. 36 (2005) 1263-1271.

DOI: 10.1007/s11661-005-0218-9

[10] O.N. Senkov, J.M. Scott, S.V. Senkova, F. Meisenkothen, D.B. Miracle, C.F. Woodward, Microstructure and elevated temperature properties of a refractory TaNbHfZrTi alloy, J Mater Sci. 47 (2012) 4062-4074.

DOI: 10.1007/s10853-012-6260-2

[11] Y. Zhang, Y.J. Zhou, J.P. Lin, G.L. Chen and P. K. Liaw. Solid-Solution Phase Formation Rules for Multi-component Alloys, Adv Eng Mater. 10 (2008) No. 6.

DOI: 10.1002/adem.200700240

[12] X. Yang, Y. Zhang. Prediction of high-entropy stabilized solid-solution in multi-component alloys, Mater Chem Phys. (2011), doi: 10. 1016/j. matchemphys. 2011. 11. 021.

[13] S. Guo, C.T. Liu. Phase stability in high entropy alloys: Formation of solid-solution phase or amorphous phase, Prog Nat Sci: Materials International. 21 (2011) 433-446.

DOI: 10.1016/s1002-0071(12)60080-x

[14] Y. Zhang, X. Yang and P. K. Liaw. Alloy Design and Properties Optimization of High-Entropy Alloys, JOM. 64 No. 7 (2012) 830-838.

DOI: 10.1007/s11837-012-0366-5

[15] J.T. Guo, Ordered Intermetallic Compound NiAl Alloy, www. sciencep. com, China, (2003).