Hot Deformation Behavior of As-Cast Mg-9Gd-2.5Y-Nd-0.5Zr Mg Alloy

Abstract:

The elevated temperature flow stress behavior of Mg-9Gd-2.5Y-1Nd-0.5Zr magnesium alloy was carried out by Gleeble-1500 thermal mechanical simulator in the temperature range of 460-520°C and in strain rates of 0.0005~1s-1 at a strain of 0.6. The optical microscopy was used for microstructure characterization. The results showed that the flow stress increases with increasing strain rates and decreasing temperature. All the deformed magnesium alloy specimens show a dynamic recovery characters in the temperature range from 460~500°C, and show dynamic recrystallization characters at 520°C. The flow stress of this alloy can be represented by Zener-Hollomon parameter function, and values of related parameters A, α and n, are 2.24×1013s-1、0.027MPa-1 and 2.93, respectively. Its activation energy for hot deformation Q is 212.6kJ/mol.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 45-51
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.45
• Online since: April 2014
• Authors: Yong Biao Yang*, Zhi Min Zhang, Feng Li Ren, Qiang Wang
• Keywords: Constitutive Equation, Dynamic Recovery, Dynamic Recrystallization (DRX), Flow Stress, Magnesium Alloy

References

[1] WILEY J. Magnesium and its alloys [M]. USA: Sons Inc.1960.

[2] Chang J. W., Guo X.W., Fu P.H, Peng L.M., and Ding W. J., [J].Electrochim. Acta, 2007, 52: 3160.

[3] Xu H., Liu J.A., and Xie S.S., [M]. Metallurgical Industry Press, Beijing, 2007: 2

[4] CAHN R W. Material science and technology: Structure and properties of nonferrous alloys (Vol.8) [M]. Beijing: Science press.

[5] ROKLIN L L. Magnesium alloy containing rare-earth metals: Structures and properties [M].Taylor & Francis, 2002: 118.

[6] YUCEL BIROL, [J] Journal of Materials Processing Technology, 2004, 148: 250-258.

[7] JIA Z H, HU G Q, FORBORDB, SOLBERG J K, [J].Mater Sci Eng A, 2007, 444(l/2): 284-290.

[8] ASTM E209. Standard practice for compression tests of metallic materials at elevated temperatures with conventional or rapid heating rates and strain rates. Annual book of ASTM standards, vol. 03.01; 2010.

DOI: 10.1520/e0209-18

[9] J. Luo, M.Q. Li, D.W. Ma, J. Mater.Proc. Technol 2012; 212(5):1039-1048

[10] C.M. Sellars, W.J. Tegart, [J]. Acta Metallurgica, 1996,63 : 731–745.

[11] SHEPPARD T, PARSON N C, ZAIDI M A, [J].Met Sci,1983,17(10):481-490.

[12] ZENER C, HOLLOMON J H., [J]. J Appl Phys, 1944,15(l):22-32.

[13] MA Ming-long, ZHANG Kui, Li Xing-gang, [J]. Trans.Nonfermus Met.Soc.China, 2008, 18: 132-139.