Fe-Mo合金の減衰能について

抄録

The measurements of internal friction Q⁻¹ and mechanical properties have been carried out for open-melted Fe-Mo alloys containing 0∼16%Mo. The Q⁻¹ values linearly increase with the maximum shear strain amplitude ε_m and decrease after reaching a peak at ε_m=about 1.2×10⁻⁴. This peak heights gradually diminish with increasing tensile load. The Q⁻¹ values are as small as 0.5×10⁻³ in the cold-worked state, while they are considerably large in the annealed state and increase with annealing temperature. The highest Q⁻¹ value of 58×10⁻³ is obtained with an Fe-6%Mo alloy annealed at 1200°C for 1 h.
The results obtained indicate that Q⁻¹ increases with measuring temperature and decreases rapidly with external magnetic field. The fairly large value of Q⁻¹ in these alloys are mainly due to the effect of magnetomechanical hysteresis. The mechanical strengths of Fe-Mo alloys increase with Mo content, for example, an Fe-6%Mo alloy shows a tensile strength of 390 MPa and a yield strength of 200 MPa, an elongation of 29% and Vickers hardness 135, when subjected to annealing at 1000°C for 1 h.