Constitutive Equation of Mg-3.5Zn-0.6Y-0.5Zr Alloy under Hot Compression Deformation

Abstract:

The hot deformation behavior of Mg-3.5Zn-0.6Y-0.5Zr alloy was investigated by compressive tests of strain rate ranges of 0.002~1 s^-1 and deformation temperature ranges of 300~450 °C using a Gleeble 1500D thermal simulator. The flow stresses in different deformation conditions are measured. The results show that flow stress is significantly affected by both deformation temperature and strain rate, the flow stress increases with increase in strain rate and decreases in deformation temperature during the hot compression process. The constitutive equation established on the basis of data of activation energy and stress exponent is a hyperbolic sine function.

• Periodical: Advanced Materials Research (Volume 800)
• Pages: 271-275
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.800.271
• Online since: September 2013
• Authors: Feng Zhang Ren, Jun Tao Zhang, Qiu Ran Gao, Yao Min Zhu, Juan Hua Su
• Keywords: Constitutive Equation, Flow Stress, True Stress-Strain Curves, Wrought Magnesium Alloy

References

[1] K. Liu, J.H. Zhang, L.L. Rokhlin, F.M. Elkin, D.X. Tang, J. Meng, Microstructures and mechanical properties of extruded Mg-8Gd-0. 4Zr alloys containing Zn, Mater. Sci. Eng. A 505 (2009) 13-19.

DOI: 10.1016/j.msea.2008.12.023

[2] Y.B. He, Q.L. Pan, Q. Chen, Z.Y. Zhang, X.Y. Liu, W.B. Li, Modelling of strain hardening and dynamic recrystallization of ZK60 magnesium alloy during hot deformation, T. Nonferr. Metal. Soc. 22 (2012) 246-254.

DOI: 10.1016/s1003-6326(11)61167-9

[3] X.Y. Yang, H. Miura, T. Sakai, Recrystallization behavior of fine-grained magnesium alloy after hot deformation, T. Nonferr. Metal. Soc. 17 (2007) 1139-1142.

DOI: 10.1016/s1003-6326(07)60239-8

[4] E. Cerri, P. Leo, P.P. De Marco, Hot compression behavior of the AZ91 magnesium alloy produced by high pressure die casting, J. Mater. Process. Tech. 189 (2007) 97-106.

DOI: 10.1016/j.jmatprotec.2007.01.010

[5] W.N. Tang, R.S. Chen, E. H. Han, Superplastic behaviors of a Mg-Zn-Y-Zr alloy processed by extrusion and equal channel angular extrusion, J. Alloy Compd. 477 (2009) 636-643.

DOI: 10.1016/j.jallcom.2008.10.089

[6] A. Sing, M. Nakamura, M. Watanabe, A. Kato, A.P. Tsai, Quasicrystal strengthened Mg-Zn-Y alloys by extrusion, Scripta Mater. 49 (2003) 417-422.

DOI: 10.1016/s1359-6462(03)00305-1

[7] B.S. Wang, R.L. Xin, G.J. Huang, X.P. Chen, Q. Liu, Hot-deformation behaviors of AZ31 alloys with different initial states, T. Nonferr. Metal. Soc. 18 (2008) s145-s149.

DOI: 10.1016/s1003-6326(10)60191-4

[8] X. Zhao, K. Zhang, X.G. Li, Y.J. Li, Q.B. He, J.F. Sun, Deformation behavior and dynamic recrystallization of Mg-Y-Nd-Gd-Zr alloy, J. Rare earth. 26 (2008) 846-850.

DOI: 10.1016/s1002-0721(09)60019-3

[9] C.M. Sellars, W.J. Tegart, G. Mc, La relation enter la resistance structure Dans le deformation a Chaud, Mem. Sci. Rev. Metall. 63 (1966) 731-746.

[10] H. Takuda, Modelling on flow stress of Mg-Al-Zn alloys at elevated temperatures, J. Mater. Process. Tech. 80-81 (1998) 513-516.

DOI: 10.1016/s0924-0136(98)00154-x