A comparison of high damping shape memory alloys with Cu-Mn-based and Fe-Cr-based alloys.
Cronauer, Joseph T.
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The strain dependence and temperature dependence of damping in the thermoelastic martensitic (shape memory) alloys titanium-nickel and copper-zinc-aluminum was compared to predetermined optimum damping behavior in the "quiet" alloys copper-manganese-aluminum and iron-chromiummolybdenum. Damping measurements were taken using a modified resonant dwell technique, in which cantilever beams were evaluated for damping at their first three resonant modes at temperatures between ambient and 110°C. Differential scanning calorimetry was used to correlate microstructural changes with damping capacity. All alloys that were conditioned for high damping showed a trend of low damping at low strains, a strain threshold, and increased damping with strains above the threshold. Damping was directly related to the progress of martensitic transformation in the Ti-Ni alloy. The Cu-Zn-Al alloy was examined in a condition which did not develop high damping. Damping in the Fe-Cr-Mo alloy was insensitive to temperature change. The damping of the Fe-Cr-Mo alloy was sensitive to temperature and time at temperature.
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