Compressive Creep Behavior of Mg-4Al-1RE-1Ca-0.2Sr Alloy

Abstract:

The compressive creep behavior of Mg-4Al-1RE-1Ca-0.2Sr (AECJ411002) alloy was investigated at temperatures in the range of 125~175°C and different compressive stress in the range of 88~112MPa with special apparatus. The results show that the creep deformation increases with the increasing of temperature and compressive stress. There is linear logarithmic relationship between the steady creep rate and all the temperature and stress used. The steady creep rate obeys an empirical equation. The stress exponents are similar at different temperatures and the appearance activation energies are not greatly different under different stresses. Their average value is respectively 6.19 and 39.05kJ/mol. Material constant A is 4.18×10-14. The steady creep rate is controlled by a dislocation climb led by grain boundary sliding. The creep resistance enhances because of the heat-resistant phases Al2Ca and Al4Sr distributing at grain boundary.

• Periodical: Applied Mechanics and Materials (Volumes 190-191)
• Pages: 431-434
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.190-191.431
• Online since: July 2012
• Authors: Dao Fen Xu, Chun Ping Du, Dong Ye
• Keywords: Activation Energy, AECJ411002 Alloy, Compressive Creep, Stress Exponent

References

[1] Poltmear I J. Materials Transaction,1996,37(1):12~31.

[2] Hajo Dieringa, Yuanding Huang, Petra Maier, et al. Materials Science and Engineering A 410–411 (2005) 85–88.

[3] A. Arunachaleswaran, I.M. Pereira, H. Dieringa, et al. Materials Science and Engineering A 460–461 (2007) 268–276.

[4] Lihong Han, Henry Hu, Derek O. et al. Materials Letters, 2007.

[5] Bai Jing, Sun Yangshan, Xue Feng, et al. Scripta Materialia 55 (2006) 1163-1166.

[6] Chen Zhenhua. Heat Resistance Magnesium Alloy[M]. Beijing:Chemical Industry Press,2006.

[7] Von Bush F, Mordike B L. Materials Science Forum,2004:107~129.

[8] WEI Xiao-wei, HUANG Qing-min. Trans. Nonferrous Met. Soc. China 16(2006)432-437.

[9] Bai Jing, Sun Yangshan, Xun Shan, et al. Materials Science and Engineering A 419 (2006) 181–188.

[10] ZHANG Yao-cheng，ZENG Ming，GUO Ping, et al. The Chinese Journal of Nonferrous Metals, 2009,19(7):1169~1175.

[11] Luo A A. International materials reviews, 2004, 49(1):13~30.

[12] Shi L, Northwood D O. Acta Metallurgica et Materialla, 1994, 42(3):871~877.

[13] Ha Kuanfu. Beijing:Science Press，1983:531.

[14] Bob R.Powell, Vadim Rezhets, Michael P. Balogh, et al. JOM 2002, 8: 34~41.