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A modified ultrasonic interferometer for sound velocity measurements in molten metals and alloys

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3 Author(s)
Nasch, Ph.M. ; Mineral Physics Group, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822 ; Manghnani, M.H. ; Secco, R.A.

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An ultrasonic interferometer has been developed for measuring compressional wave velocity (VP) and attenuation (or conversely, quality factor QP) in molten Fe, Fe‐Ni, Fe‐Ni‐S, and Fe‐Ni‐Si alloys. Results for pure molten Fe are presented. A radio frequency (rf) induction technique is used for heating that allows a ±1 K temperature stability at 1973 K. The effects of the electromagnetic field interaction with the molten conductive metal are discussed in terms of applicability to VP and QP measurements. Considerations of acoustic impedance and thermal absorption are presented to discuss the high‐temperature use of polycrystalline Al2O3 buffer rods for velocity and attenuation measurements. Viscoelastic theories, when applied to pure molten Fe, predict an extremely small acoustic coefficient of attenuation. Suggestions are made to circumvent the experimental difficulties encountered in attenuation measurements.

Published in:

Review of Scientific Instruments  (Volume:65 ,  Issue: 3 )

Date of Publication:

Mar 1994

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