| Purpose of this study was to develop non-destructive material evaluation method of aluminum alloy base metal matrix composite(MMC) by ultrasonics. Five aluminum base MMC specimen were fubricated in which the fractional ratios of fiber were changed from 0% to 31%. Relation between acoustic properties, microstructural features, and elastic constant were compared. Ultrasonic velocity method was, then, useful for nondestructive elastic constant measurement of composite materials, since the method had as same measurement accuracy as conventional strain measurement method. Furthermore, velocity and attenuation parameter also related to the fractional ratio of fiber and these relation could utilize ultrasonic non-destructive evaluation of fiber structure in MMC. |
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