Abstract
The measurements of internal friction Q−1 under tensile loading and mechanical properties have been carried out on open-melted Fe-Co alloys containing 5∼25%Co subjected to annealing at 900∼1200°C. The value of Q−1 at a frequency of 0.3∼1.1 Hz first increases sharply to a maximum with an increase in maximum shear strain amplitude and then decreases gradually. The higher the annealing temperature and the Co content, the greater becomes Q−1. An Fe-25%Co alloy exhibits the highest Q−1 value of 75×10−3 when annealed at 1200°C for 1 h. When the measuring temperature becomes higher, the Q−1 value at first decreases from about 400°C and sharply increases after reaching a minimum in the vicinity of 550°C. Moreover, the Q−1 value decreases rapidly with an increase in external d.c. magnetic field. The mechanical strength of Fe-Co alloys increases considerably with Co content.
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