日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 2 (1976),
pp. 193-196

Propagation Characteristics of Ultrasonic Waves in Antiferromagnetic Cr-Fe-Mn Invar Alloy

Hideo Saito1, Kunio Wakaoka2 and Kazuaki Fukamichi1

1The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai
2Products Development Laboratory, Television Division, Matsushita Electric Industrial Co. Ltd., Osaka

Abstract:

Invar and Elinvar alloys have wide applications of electromagnetic and precision instrumentation engineering. Elinvar alloys are often used for delay lines.
We have studied the propagation characteristics of ultrasonic waves in an antiferromagnetic Cr-Fe-Mn Invar alloy which has also the Elinvar characteristics. The results show that both the temperature coefficient of the delay time and the attenuation coefficient of ultrasonic waves in the alloy are very small showing excellent propagation characteristics and sufficient responses of output can be obtained oven at the input of 20 MHz.
The mean value of the grain size of the alloy is 60.8 μ , and an intermediate scattering of ultrasonic waves between the Rayleigh scattering and the stochastic scattering occurs.
Mechanical working of the alloy such as grinding, polishing and lathing can relatively easily be done.
From the above-mentioned results, it is concluded that the antiferromagnetic Cr-Fe-Mn Invar alloy is an excellent delay medium for the propagation of ultrasonic waves.


(Received 1975/09/10)

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