Abstract
Single crystals of magnesium oriented for (001) [1̄21̄0] slip were fatigued in axial push-pull at constant plastic strain amplitude at 78 K and at room temperature. The room temperature hardening curve of magnesium can be divided into three stages based on the hardening rate. The 78 K hardening curve has only two stages. The prominent dislocation structure in the fatigued specimens observed by transmission electron microscopy and etching is a wall form. The average wall spacing depends markedly on temperature, and is 8 and 2 μm at room temperature and 78 K respectively. Basal loops with stacking fault as well as rows of loops paralled to the primary Burgers vector were observed in all specimens fatigued beyond a cumulative strain of 100 at room temperature. These loops were not observed at 78 K, and are thought to be responsible for the third stage of the room temperature hardening curve.
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