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Measurement and Analysis of Sound Absorption of Porous Magnesium

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Abstract:

Lotus-type porous magnesium whose long cylindrical pores were aligned in one direction was fabricated by unidirectional solidification of the melt dissolving hydrogen in a pressurized hydrogen atmosphere. The sound absorption coefficient of porous magnesium whose specimen face has many open pores was measured by standing-wave method in the range up to the frequency of sound of 4 kHz. The relationship between absorption coefficient and pore structure of porous magnesium was studied. The absorption coefficient increases with decrease of the pore size, while it increases with increase of the porosity. Moreover, the peak value with high absorption coefficient is shifted toward higher frequency of sound when the thickness of the porous magnesium specimen decreases.

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Periodical:

Materials Science Forum (Volumes 449-452)

Pages:

661-664

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.449-452.661

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Online since:

March 2004

Authors:

Zhen Kai Xie, Teruyuki Ikeda, Yosiyuki Okuda, Hideo Nakajima

Keywords:

Absorption Coefficient, Hydrogen, Magnesium, Pore Size, Porosity

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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