Abstract
The damping behavior of a model ferroelastic-reinforced–metal matrix composite (FR-MMC) system was examined through the incorporation of barium titanate (BaTiO3) particles into a Cu-10 wt pct Sn (bearing bronze) matrix. The damping properties of the resulting FR-MMC were investigated vs frequency, temperature (above and below the Curie temperature of the ferroelastic reinforcement), and number of strain cycles. Dynamic mechanical analysis (DMA) indicates that the incorporation of the ferroelastic-capable reinforcement significantly augments the damping capability relative to the matrix alone, and also with respect to the damping that would result from the presence of passive composite reinforcements. Neutron diffraction data demonstrate a strong correlation of domain reorientation activity to imposed stress level and demonstrate a degree of reversibility important to the potential practical application of this mechanism of damping.
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