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AC and dc magnetic properties and related losses of FeCo alloy sheet samples have been determined under applied tensile stress. Heat-treated strips of alloys Hiperco 50 Hiperco 50-HS and Hiperco 27 with three different orientations (0°-45°-90°) with respect to the rolling direction were tested under tensile stresses up to 200 MPa. In our earlier work, we reported the effect of the compressive stress on the same alloy compositions . Unlike compressive stress, tensile stress decreased the coercivity and increased remanence of the alloys. For the 90°-oriented Hiperco 50 alloy with a coercivity of 1.12 Oe under no applied stress, the minimum coercivity of 0.29 Oe occurred at about 100 MPa. The effect of tensile stress on the remanence was most pronounced in the Hiperco 50 HS samples. A gradual decrease in the coercive field of the three Hiperco 50 HS samples was observed up to 200 MPa. On the other hand, a minimum at 25 MPa is observed for the coercivity of Hiperco 27 samples. At the same tensile stress, the remanence ratio had a maximum. The 0°-oriented sample exhibited the lowest core loss value of the Hiperco 27 samples.
Date of Publication: July 2004