ABSTRACT

The effects of different thermal–mechanical treatments on defect configurations and damping capacity were investigated in a cold-drawn Fe–17.5Mn–0.022C alloy to further clarify the main damping sources and thus to enhance the damping capacity in high strength Fe–Mn based alloys, especially at low strain amplitudes. The results showed that the damping capacity at the low strain amplitude of 4 × 10⁻⁴ in the quenched alloy increased by 176% after ageing and deformation. The amount of the stacking faults and the mobility of associated Shockley partial dislocations control the damping capacity in high strength Fe–Mn based alloys. Atoms segregation to the stacking faults pins the movement of partial dislocations more strongly than vacancies did. Both increasing the amount of the stacking faults and reducing the pinning of Shockley partial dislocations are direction for designing the high strength Fe–Mn alloys with high damping capacity.

摘要

在冷拔 Fe-17.5Mn-0.022C 合金中研究了不同热机械处理对缺陷配置和阻尼能力的影响，以进一步明确主要阻尼源，从而提高高强度 Fe-Mn 基合金的阻尼能力合金，特别是在低应变幅度下。结果表明，在 4 × 10 ^-4在时效和变形后，淬火合金增加了 176%。堆垛层错的数量和相关的肖克利部分位错的迁移率控制着高强度 Fe-Mn 基合金的阻尼能力。原子偏析到堆垛层错比空位更强烈地固定部分位错的运动。增加堆垛层错数量和减少肖克利部分位错的钉扎是设计高强度高阻尼铁锰合金的方向。