aluminum alloys reinforced with continuous graphite fibers are light weight, high stiffness materials with potentially superior mechanical properties and stability in a hostile environment. such metal matrix composites have certain advantages over the more common polymer based composites by virtue of their good electrical and thermal conductivities and high melting point. our research addresses the measurement of ultrasonic wave velocity along the direction of the reinforcing fibers as a function of temperature in graphite/ aluminum composite plates. since the physical properties of the matrix and the fibers are very different, particularly in regard to the coefficients of thermal expansion, it is anticipated that irreversible changes may occur in the composite as a result of the internal stresses generated during thermal cycling. (author)
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