Production of an Amorphous Fe_<75>Si_<10>B_<15> Sheet by a Metallic Mold Casting Method and its Properties

概要

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The application of a metallic mold casting method to an Fe_<75>Si_<10>B_<15> alloy with the largest glass-forming ability in (Fe, Co, Ni)-Si-B system was found to cause the formation of a mostly single amorphous phase in a sheet form with a thickness of 0.1 mm. No distinct difference in thermal stability (crystallization temperature and heat of crystallization), hardness, Curie temperature and magnetization is detected between the as-cast sheet and the melt-spun amorphous ribbon with a thickness of 0.02 mm. On the other hand, bending ductility, heat of relaxation (ΔH_r) and coercivity (H_c) which can be regarded as structure sensitive properties are significantly different from those for the amorphous ribbon. That is, the sheet sample fractures during bending deformation and has a smaller ΔH_r and a larger H_c. The difference is induced presumably because the sheet sample has a more relaxed atomic configuration on a short-range scale as compared with that for the amorphous ribbon sample.
東北大学の論文
1993-03-29