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Temperature dependent damping studies of Ni-Mn-Ga polymer composites

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Abstract

Mechanical properties of ferromagnetic shape memory alloy (FSMA) polyurethane (PU) polymer composites are studied using dynamic mechanical analysis (DMA) at different temperatures. The sample used in the study is Ni-Mn-Ga/PU polymer composite. DMA studies reveal that the mechanical modulus decreases, when the temperature increases. The peak in internal friction (tanδ) appears twice due to martensite transformation of the reinforced particles and glass transition of the polymer matrix. The strain is due to the motion of twin boundaries rather than the phase transformations. Twin boundary motion is found to be the root cause for the martensite-austenite transformation and vice versa, and leads to enhanced damping mechanism. Speculations on twin boundaries of this sample to show concrete evidence on change in internal friction (tanδ) are still underway. This paper proposes that Ni-Mn-Ga/PU polymer composites can be used as efficient dampers.

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Correspondence to M. Mahendran.

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Senthur Pandi, R., Mahendran, M., Chokkalingam, R. et al. Temperature dependent damping studies of Ni-Mn-Ga polymer composites. Bull Mater Sci 34, 739–743 (2011). https://doi.org/10.1007/s12034-011-0189-y

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  • DOI: https://doi.org/10.1007/s12034-011-0189-y

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