This study primarily investigates the internal friction (IF) behaviour of Ti50Ni48Cu2 (TNC2) shape memory alloy (SMA) through temperature, frequency, isothermal, and strain sweep analysis using a Dynamic mechanical analyser (DMA). The total internal friction (IFTotal) value of TNC2 alloy is 0.0686 at 323.4 K. The frequency sweep analysis reveals that increasing the frequency reduces the IFTotal by 15.97% due to restricted martensitic interface movement. Isothermal analysis shows a significant drop in IFTotal during the B2-B19′ transformation peak, with reductions of 79.02%, stabilising as intrinsic damping dominates. Strain sweep tests demonstrate that higher strain at isothermal temperature (323.4K) increases inherent internal friction (IFPT + IFInt)B2–B19′, with a frequency-dependent trend. The secondary focus is decomposing the IFTotal into its intrinsic (IFInt) and inherent internal friction (IFPT + IFInt)B2–B19′, components using an iterative method. The iterative method effectively separates IFTotal, allowing precise calculation of the transformed volume fraction n(T). After eight iterations, convergence is achieved with a minimal error rate. The predicted IF spectrum closely matches experimental data, highlighting the method’s reliability for decomposing IFTotal into its contributions.
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