アルミ基複合材料鋳物のハイブリッド砂型鋳造法の開発
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概要
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The ultrasonic measurement was carried out to detect porosities in aluminum alloy base composite castings (MMC-Casts) produced by hybrid method of the sand-mold casting and the low pressure casting. Irradiation of the ultrasonic wave with a frequency of 5 MHz and 20 MHz showed that the ultrasonic wave propagated to the bottom of the specimen of 10 mm in thickness with large scatter from SiC particles distributed in MMC-Casts. By using the Al-Cu alloy castings with a thickness of 19 mm, artificial holes of different diameter were measured from the other side, and a hole of 1 mm in diameter was detected with theultrasonic wave of a frequency of 5 MHz.
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