Stress-Induced Twin Boundary Motion in Particulate Ni-Mn-Ga /Polymer Composites

Abstract:

Composites of Ni–Mn–Ga particles in a polyurethane matrix can be made by mixing the particles with the polymer, and allowing them to cure under a magnetic field to texture the composites. These composites show large hysteresis and mechanical losses, when subjected to a cyclic stress, that were far larger than the matrix polymer ones. The additional losses are attributed to the motion of twin boundaries in the filler particles and provide a way for obtaining mechanical energy absorption in a wide frequency range. By means of X-ray and neutron diffraction we present evidence that confirms that twins are present in the particles and that they do move when mechanically loading the composite

• Periodical: Materials Science Forum (Volume 583)
• Pages: 197-212
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.583.197
• Online since: May 2008
• Authors: Jorge Feuchtwanger, Marc L. Richard, Patricia Lázpita, Jon Gutiérrez, José M. Barandiarán, Samuel M. Allen, Robert C. O'Handley
• Keywords: Composite, Ferromagnetic Shape Memory Alloys (FSMAs), Mechanical Energy Absorption, Neutron Diffraction, X-Ray Diffraction (XRD)

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