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A1-Si closed-cell aluminum foam bare boards of 1 240 mm×1 100 mm with different densities and thicknesses were prepared by molten body transitional foaming process. The sound reduction index(R) of AI-Si closed-cell aluminum foam bare boards was investigated experimentally under different frequencies (100-4 000 Hz). It is found that sound reduction index(R) is small under low frequencies, large under...
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