Acoustic Energy Absorption in Ferromagnetic Ni-Mn-Ga Shape Memory Alloy Polymer Composites

Mahendran Manickam; Jorge Feuchtwanger; Robert C. O'Handley

doi:10.4028/www.scientific.net/AMR.52.87

Paper Titles

Martensite Transformation and Magnetic Property Dependence on the Annealing Temperature in Ni-Rich Ni-Mn-Ga Alloy
p.57

Influence of Annealing Temperature on the Properties of Co-Ni-Ga Ferromagnetic Shape Memory Alloy
p.63

Textural Ordering in NiTi, Ni-Fe-Ti, and Ni-Mn-Ga Shape Memory Alloys - Kinetics of Intra- and Inter-Domain Processes
p.69

Effect of Site Disorder on Martensitic Transformation in Ferromagnetic Ni₅₅Fe₂₀Al₂₅ Alloy as Inferred from Magnetic and Magneto-Transport Measurements
p.77

Acoustic Energy Absorption in Ferromagnetic Ni-Mn-Ga Shape Memory Alloy Polymer Composites
p.87

Co-Ni-Ga Alloys with Room Temperature Ferromagnetic Martensite Phase
p.95

Structural Characterization of Co_70-xNi_xGa₃₀ Ferromagnetic Shape Memory Alloys
p.103

Structural Studies on Mn Excess and Ga Deficient Ni-Mn-Ga
p.109

Mapping of Magnetic Domains by MFM in Ni₂MnGa
p.115

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Acoustic Energy Absorption in Ferromagnetic Ni-Mn-Ga Shape Memory Alloy Polymer Composites

Abstract:

The single crystal Ni-Mn-Ga and Ni-Mn-Ga particulate composites have responded to mechanical stress up to 1 kHz frequencies with significant acoustic attenuation. It has been observed that in Ni-Mn-Ga polymer composites, a heavy static load on both the ends of the system increases the acoustic stress amplitude and appears to have acoustic loss drops. The attenuation, as a function of frequency shows resonances in the displacement of the vibrating particle indicating the twin boundary motions. It is inferred that the resonances beyond the principal mode are highly damped in the Ni-Mn-Ga composite samples.