The underlying low-stress cyclic deformation and associated dislocation activities within the slip bands (SBs) in a rare earth-containing magnesium (RE-Mg) alloy were characterized. The results show that basal slip is the predominant deformation at grain scale, but the gliding of 〈c + a〉 dislocation is also visible near grain boundaries to accommodate localized inhomogeneous deformation. The interaction between basal 〈a〉 dislocations and non-basal 〈c + a〉 dislocations results in the nucleation of dislocation intensity zones (DIZs), which subsequently hinders the development of the basal slip bands. Therefore, it is suggested that the DIZs contributed to the enhanced high cycle fatigue resistance of RE-Mg alloys.

表征了含稀土镁（RE-Mg）合金在滑带（SBs）内潜在的低应力循环变形和相关的位错活性。结果表明，基层滑移是晶粒尺度上的主要变形，但在晶界附近也可以看到<c + a>位错的滑动，以适应局部的不均匀变形。基底<a>位错和非基底<c + a>位错之间的相互作用导致位错强度带（DIZs）成核，从而阻碍了基底滑带的发展。因此，建议DIZ有助于增强RE-Mg合金的高循环疲劳强度。