- Conference date: 25-30 July 2004
- Location: Golden, Colorado (USA)
Laser‐ultrasonics is used to assess the metallurgical bond between Mg/Al materials in die‐cast Magnesium/Aluminum composite. The acoustic impedances of Mg, Al and air are such that the amplitude of ultrasonic echoes reflected back from a void is many times larger than the amplitude of those reflected back from a well‐bonded interface. In addition, the polarity of echoes from a void is inverted compared to that from a well‐bonded interface. Laser‐ultrasonic F‐SAFT is also used for imaging tilted Mg/Al interfaces. Experimental setup, signal processing and results for detecting voids in the Mg/Al interface of cast parts are presented.
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