Low frequency damping properties of a NiMnTi shape memory alloy
2011
Chang, Shih-Hang
The present study investigated the low frequency damping properties of a NiMnTi shape memory alloy (SMA) for the first time. The NiMnTi SMA had a high β⟶θ′ internal friction peak at approximately 125°C and a low relaxation peak at approximately −45°C in the dynamic mechanical analysis cooling tan δ curve. The relaxation peak possessed an activation energy of 0.64±0.03eV and its damping capacity gradually decreased with the increase of thermal cycling. The NiMnTi SMA also had a good inherent internal friction with tan δ=0.009 at approximately 140°C and is a promising high damping alloy for high temperature applications.
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