The texture and local orientation after compression of a NiMnGa polycrystal and a bicrystal with 5M modulated structure were measured with synchrotron radiation and electron back-scattering diffraction, respectively. Compression of both samples leads to motion of those twin boundaries changing the volume fraction of particular martensitic variants in such a way that the shortest axis (c-axis) becomes preferentially aligned parallel to the compression axis. Electron back-scattering diffraction directly confirmed the motion of twin boundaries within individual grains.

Deformation Twinning in Polycrystalline NiMnGa Alloys. R.Chulist, M.Pötschke, T.Lippmann, C.G.Oertel, W.Skrotzki: Journal of Physics - Conference Series, 2010, 240[1], 012024