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The Fe-B-C ternary amorphous alloys

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4 Author(s)
Luborsky, F. ; General Electric Corporate Research and Development Center, Schenectady, N.Y. ; Becker, J. ; Walter, John L. ; Martin, D.L.

The properties of amorphous Fe-B-C alloys have been studied. The replacement of boron by carbon reduces the thermal stability of alloys containing more than approximately 80-percent iron, increases the Curie temperature slightly, and decreases the slope of the magnetization-temperature curve. Thus, although the low-temperature saturation magnetization decreases on replacement of B by C, as expected, the room-temperature magnetization exhibits a broad ridge of constant saturation magnetization per gram extending from approximately Fe80B20to approximately Fe83B11C6. This ridge follows one of the low-temperature magnetization contours. The density of the alloys in the series Fe84B16-xCxwas measured and compared to calculated densities. The increase in density agrees with the calculated values and results in a slight increase in saturation magnetization per unit volume with increase in carbon. The coercivity, both as-cast and after stress relief annealing, increases on replacement of B by C. This is not understood.

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Magnetics, IEEE Transactions on  (Volume:16 ,  Issue: 3 )