The effect of texture upon the low-cycle fatigue behavior of the rolled magnesium alloy was studied at room temperature. It was shown that the Coffin–Manson and Basquin relationships could be used to describe the fatigue resistance of the alloy. The alloy loaded along the rolling direction exhibited only slightly better low-cycle fatigue resistance than that loaded along the transverse direction, due to the in-plane texture symmetry. The in-plane cases exhibited better fatigue behavior than the through-thickness loading. Neutron diffraction and synchrotron diffraction were employed to assist in making mechanistic understandings for the findings. The fundamental difference in the low-cycle fatigue behaviors between the in-plane and through-thickness loadings was attributed to the different activation sequences of twinning and de-twinning mechanisms involved and, particularly, the greater requirement for c-axis compression of the grains during the through-thickness tests. The different activation sequences were essentially determined by the initial crystallographic texture, such that the inverted hysteresis-loop shapes were observed.

The Effects of Texture and Extension Twinning on the Low-Cycle Fatigue Behavior of a Rolled Magnesium Alloy, AZ31B. L.Wu, S.R.Agnew, Y.Ren, D.W.Brown, B.Clausen, G.M.Stoica, H.R.Wenk, P.K.Liaw: Materials Science and Engineering A, 2010, 527[26], 7057-67