Anelastic and Elastic Measurements in Aluminum Metal Matrix Composites

    Published: Jan 1988

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    The piezoelectric ultrasonic composite oscillator technique (PUCOT) has been used at temperatures up to 638 K and at 80 kHz to measure dynamic Young's modulus E, mechanical damping or internal friction Q−1 and strain amplitude ϵ in Al/SiCw and Al/Sicp. For four adjacent specimens from one sheet of 6061 Al/SiCp E-values varied in the range 114–119 GPa at room temperature. The composition dependence of the modulus followed E = 68.6 + 2.2X with R = 0.95 (E is in GPa and X in volume percent SiC). The temperature dependence of the dynamic modulus followed E = 138.7 − 0.11T with R = 0.98 (E is in GPa and T in Kelvin). The amplitude dependence of Q−1 for 6061 Al/SiCw revealed a damping peak at ϵ = 10−6. An analysis of the internal friction data in terms of a damping theory yielded values for the minor pinning length of dislocation lines and the density of mobile dislocations. The results are discussed in terms of the microstructure.


    dynamic modulus, damping, internal friction, temperature, composition, aluminum, silicon carbide, metal matrix composites, composites, dislocations, whiskers, particles, mechanical properties, anelasticity, elasticity

    Author Information:

    Wolfenden, A
    Professor and lecturer, Texas A&M University, College Station, TX

    Harmouche, MR
    Professor and lecturer, Texas A&M University, College Station, TX

    Hayes, SV
    Lead engineer, LTV Aerospace and Defense Company, Dallas, TX

    Committee/Subcommittee: D30.07

    DOI: 10.1520/STP25954S

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