在700℃对DZX40M合金在不同的总应变幅控制下进行低周疲劳实验结果显示：起始硬化相对室温时变得非常显著，经过短暂的饱和阶段后出现明显的二次硬化现象。TEM分析表明：起始硬化是由于层错交割对层错运动的阻碍引起层错塞积所致；700℃的饱和阶段是由于层错交割处塞积的层错群引起的应力集中超过层错交割的阻碍作用，因此塞积层错能“自由”地通过层错交割；二次硬化现象是由于不同滑移系的位错发生交互作用形成位错缠绕引起的。
An investigation has been made on the low cycle fatigue behavior of a DZX40M Co-base directionally solidified superalloy at 700℃ in air under the control of different total strain amplitudes ranging from 3.0 × 10(-3) to 6.0 ×10(-3). The results show that the alloy exhibits a pronounced initial hardening, and secondary hardening after a short saturation. Examination by TEM reveals that the initial hardening is arising from the pile-up of the stacking faults at the intersection of stacking faults, while the stress saturation is due to the obstacle to the motion of the stacking faults at the intersection becomes weaker, arising from the thermal activation, and the stress concentration of the pile-up of the stacking faults at the intersection. The secondary hardening is contributed to the formation of the dislocation tangle.
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