The High Temperature Creep Behavior of Mg-5Li-3Al-2Zn-2Cu Alloy

Abstract:

The room-temperature mechanical properties of the extruded Mg-5Li-3Al-2Zn-2Cu alloy (LAZ532-2Cu) were researched previously. In this paper, the creep behavior of the extruded LAZ532-2Cu alloy was studied at the temperature range from 398K to 448K, with the stress 60MPa, 80MPa and 100MPa. The microstructure of the alloy consists of the matrix α-Mg solid solution and the intermetallic compounds on the grain boundary or in the grain. The microstructural analysis of the alloy reveals the correlation between microstructure and creep properties. The stress exponent n 3.72, 4.8, 6.1, the activation energy Qc 94.8kJ/mol, 123.9kJ/mol, 128 kJ/mol were calculated at the test condition. The creep test samples were combined with detailed transmission electron microscopy and X-ray diffractometry in order to characterize the precipitated AlLi phase, which contributes to the creep resistance by obstructing the dislocation movement in dislocation creep.

• Periodical: Advanced Materials Research (Volumes 760-762)
• Pages: 759-762
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.760-762.759
• Online since: September 2013
• Authors: Ting Qu Li, Xiang Ling Liu, Zhan Yi Cao
• Keywords: Aging Strengthening, Creep Property, Mg-Li Alloys, Microstructure

References

[1] Z. Drozd, Z. Trojanová, S. Kúdela. J. Alloys Compd. 378 (2004), 192–195.

[2] T.Q. Li, Y.B. Liu, Z.Y. Cao, et al. J. Alloys Compd. 509 (2011) 7607–7610.

[3] R.Z. Wu, Y.S. Deng, M.L. Zhang, J. Mater. Sci. 44 (2009) 4132–4139.

[4] J.H. Zhang, Z. Leng, M.L. Zhang, et al. J. Alloys Compd. 509 (2011) 1069–1078.

[5] T.Q. Li, Y.B. Liu, Z.Y. Cao, et al. Mater. Sci. Eng. A 527 (2010) 7808–7811.

[6] W.J. Kim, M.J. Kim, J.Y. Wang, Mater. Sci. Eng. A 516 (2009) 17–22.

[7] J.Q. Li, Z.K. Qu, R.Z. Wu, et al. Mater. Sci. Eng. A 528 (2011)3915–3920.

[8] R. Fernandez, G. Gonzalez-Doncel. Acta Mater. 56(2008), 2549.

[9] K.T. Park, F.A. Mohamed. Metall Mater Trans A, 12 (1995), 3119−3129.

[10] T.Q. Li, Y.B. Liu, Z.Y. Cao, et al. Advanced Materials Research Vol. 213 (2011) pp.492-496.

[11] P. Zhang. Scripta Mater. 52, (2005), 277−282.

[12] S. Spigareli, M. Cabibbo, E. Evangelista, et al. Mater Sci. Eng. A 289(2000), 172–181.

[13] S. Kobayashi, T. Yoshimura, S. Tsurekawa, et al. Mater. Trans. 44(2003), 1469-1479.

[14] H.J. Frost, M.F. Ashby. Oxford: Pergamon Press, 1982: 44.