Mechanical properties of Fe-Si-B amorphous wires produced by in-rotating-water spinning method
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INTRODUCTION
MELT-quenching techniques such as melt-extrusion, 1'2'3 chill-block melt spinning,l'4'5 pendant drop melt extraction,t'5 melt drag, 1crucible melt extraction, 6'7 and glass-coated melt spinning 8 have been described for the production of metallic wires having a nearly circular cross section. It is generally difficult to produce uniform, continuous wires of metals and alloys directly from the melt because of the combination of low viscosity and high surface tension of metallic melts. Hence, only two methods of melt-quenching (glass-coated melt spinning and the melt-extrusion through a small orifice into flowing water) 9'1~have been reported to be used in the production of amorphous wires. Recently, Ohnaka 11 has described a modified meltspinning apparatus in which the melt is ejected through a small crucible orifice into rotating water. This technique has been demonstrated to be useful for the production of continuous Pd-Cu-Si amorphous wires having a circular cross section (0.05 to 0.2 mm in diameter). ~2 In the subsequent investigations, we have also succeeded in producing continuous amorphous wires of Fe-Si-B ternary and Fe-MSi-B (M = transition metals of Ti, V, Nb, Ta, Cr, Mo, and W) quaternary alloys which are important alloy systems for high strength and soft magnetic material applications. The aim of this paper is to present the procedures for the production of the iron-based amorphous wires and to report their shape, size, mechanical properties, and thermal stability.
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EXPERIMENTAL METHODS
The specimens used in the present work are Feloo_x_ySixBy ternary and (Fe10o.xMx)75Si10B15(M = Ti, Zr, V, Nb, Ta, Cr, M. HAGIWARA is with Research Staff, Unitika Research Center, Unitika Ltd., Uji 611, Japan. A. INOUE, Research Assistant, and T. MASUMOTO, Professor, are both with The Research Institute for Iron, Steel, and Other Metals, Tohoku University, Sendai 980, Japan. Manuscript submitted June 12, 1981. METALLURGICAL TRANSACTIONS A
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Mo, W, Mn, Co, Ni, Pd, or A1) quaternary alloys. Mixtures of electrolytic iron, pure metalloids (silicon and boron), and pure transition metal were melted under an argon atmosphere in an induction furnace. The melt was sucked up into a quartz tube of about 3 mm inner diameter and allowed to solidify. Since the difference between weighed and chemically analyzed compositions was less than 0.05 wt pct for silicon and 0.10 wt pct for boron, alloy compositions were expressed by the weighed values in at. pct. Continuous amorphous wires with various diameters between 0.07 and 0.27 mm were prepared from the master alloys by a modified melt spinning apparatus in which the melt is ejected through an orifice into the rotating water. The details of the apparatus are described in References 12 and 13. Typically, the amount of alloy melted in one run was about 1 g, the rotation speed of the drum (50 cm in diameter) was about 340 rpm, and the depth of the cooling water was about 2.5 cm. The details of spinning conditions will be represented in section III-B of this paper. Identifi
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