Tensile and Compressive Creep Behavior of Coarse-Grained Mg-Al-Sr Castings
Tensile and compressive creep properties of Mg-5wt.%Al-1wt.%Sr alloy produced by gravity casting were investigated in this paper. Creep tests were carried out in the temperature range from 125 °C to 200 °C and stress range from 35 to 85MPa. The second creep rate in tension is significant different from that in compression, indicating that coarse-grained Mg-Al-Sr alloy exhibits tension/compression asymmetric behavior. Moreover, the activation energies and stress exponent in tension and compression are not the same, which suggest that creep mechanisms in tension and compression are different.
Yafang Han et al.
P. Zhao et al., "Tensile and Compressive Creep Behavior of Coarse-Grained Mg-Al-Sr Castings", Materials Science Forum, Vols. 546-549, pp. 171-174, 2007