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

Abstract:

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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

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Periodical:

Edited by:

V.A. Chernenko

Pages:

197-212

DOI:

10.4028/www.scientific.net/MSF.583.197

Citation:

J. Feuchtwanger et al., "Stress-Induced Twin Boundary Motion in Particulate Ni-Mn-Ga /Polymer Composites ", Materials Science Forum, Vol. 583, pp. 197-212, 2008

Online since:

May 2008

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