Lotus-type porous magnesium with many unidirectional cylindrical pores was fabricated by unidirectional solidification of a 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 the standing-wave method in the sound frequency range up to 4 kHz. The absorption coefficient increases with decreasing pore size, while it increases with porosity. Moreover, the peak value with a high absorption coefficient is shifted toward a higher sound frequency when the thickness of the porous magnesium specimen decreases. It is suggested that lotus-type porous magnesium exhibits excellent sound absorption characteristics.
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Xie et al. (2004) studied this question.