LAUSR

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.