日本金属学会誌

J. Japan Inst. Metals, Vol. 54, No. 4 (1990),
pp. 485-492

Magnetic Properties of Fe-Mo-W Semihard Magnetic Alloys

Naoji Nakamura1, Yuetsu Murakami1, Nobukiyo Kobayashi1 and Seishi Abe1

1The Research Institute of Electric and Magnetic Materials, 2-1-1, Yagiyama-minami, Sendai, 982

Abstract:

Magnetic properties of Fe-Mo-W alloys containing equivalent amounts of less than 6 mass%Mo and less than 6 mass%W were studied. The specimens of fine wires 0.5 mm in diameter used were prepared by cold-drawing to 50~99% reduction in area after melting in vacuum and subsequent water-quenching from 1173-1373 K. Subsequently, all the fine specimens were reheated at 673-1273 K for the durations less than 18 ks.
It is found that the workability of Fe-Mo-W alloys depends largely on the [Mo+W] content and the reduction in area by cold-drawing. The magnetic properties also depend largely on the [Mo+W] content, water-quenching temperature, reduction in area and reheating treatment. The magnetic behavior of Fe-Mo-W alloys are generally similar to that of Fe-Mo and Fe-W alloys. Moreover, at the composition of less than 8 mass%[Mo+W], both the magnetic induction B8 at 8 kA•m-1 and the residual induction Br were higher than those of the Fe-Mo and Fe-W alloys. The coercive force Hc shows an intermediate value between those of the Fe-Mo and Fe-W alloys. The thermal expansion coefficient near room temperature, αT, were lower than those of the Fe-Mo and Fe-W alloys.
The Fe-3%massMo-3%massW alloy reheated at 873 K for 18 ks after water-quenching from 1273 K and subsequent cold-drawing to 99% reduction exhibited B8 = 1.91 T, Br = 1.88 T, Hc = 1.55 kA•m-1, the squareness ratio Br/B8 = 0.93, the squareness factor \sqrt(BH)max/BrHc = 0.86 and αT (273-673\ K) = 11.7 × 10-6 K-1.


(Received 1989/11/2)

Keywords:

semihard magnetic alloy, iron-molybdenum-tungsten alloy, rectangular magnetic hysteresis, thermal expansion coefficient, precipitation, fiber texture, workability


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