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http://dx.doi.org/10.5228/KSPP.2008.17.8.558

Prediction of Creep Deformation and Short Time Rupture Life of AZ31 Magnesium Alloy below 0.5Tm  

Kang, D.M. (부경대학교 기계공학부)
An, J.O. (부경대학교 기계공학부)
Jeon, S.H. (부경대학교 기계공학부)
Koo, Y. (부경대학교 기계공학부)
Sim, S.B. (부경대학교 기계공학부)
Publication Information
Transactions of Materials Processing / v.17, no.8, 2008 , pp. 558-563 More about this Journal
Abstract
The initial strain, the applied stress exponent, the activation energy, and rupture time in AZ31 magnesium alloy have been measured in order to predict the deformation mechanism and rupture life of creep over the temperature range of 423-443K. Creep tests were carried out under constant applied stress and temperature, and the lever type tester and automatic temperature controller was used for it, respectively. The experimental results showed that the applied stress exponent was about 9.74, and the activation energy for creep, 113.6KJ/mol was less than that of the self diffusion of Mg alloy including aluminum. From the results, the mechanism for creep deformation seems to be controlled by cross slip at the temperature range of 423-443K. Also the higher the applied stress and temperature, the higher the initial strain. And the rupture time for creep decreased as quadratic function with increasing the initial strain in double logarithmic axis.
Keywords
Activation Energy; Stress Exponent; Deformation Mechanism; Rupture Life for Creep; Initial Strain Method;
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  • Reference
1 J. P. Eum, S. G. Lim, B. Y. Hur., 1999, Development of Mg-Zn-(Mn, Ca) Alloy, Korea Inst. of Casting, Vol. 19/1, pp. 7-14
2 W. Blum, et. al., 2003, Creep Resistance and Creep Kinetics of Mg-alloys, Proceedings of the 6th International Conference Magnesium Alloys and their Applications, pp. 62-67
3 C. Sheldon Roberts, 1958, Magnesium and Its Alloys, John and Sons, Inc., pp. 158-159
4 G. Schoek, A. Seeger, 1955, Defect in crystalline solids, London Physics Society of London, pp. 340-346
5 A. Seeger, 1954, The Temperature Dependence of the Critical Shear Stress and of Work Hardening of Metal Crystals, Phil.Mag., Vol.45, pp. 771-773   DOI
6 W. F. Sheerly, R. R. Nash, 1960, Trans Metall. Soc. AIME, Vol.218, p. 416
7 J. Polmear, 1991, Proceedings of International Conference on Recent Advances in Science and Engineering of Light Metal, Japan Inst. Light Metals, p. 201
8 O. D. Sherby, J. L. Lytton, J. E. Dorn, 1957, Activation Energies for Creep of high-Purity Aluminum, Acta Metallurgica, Vol.5, pp. 219-227   DOI   ScienceOn