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TT4.02 - Four Dimensional X-Ray Microscopy of Domain Boundaries in NiMnGa Crystals 
December 2, 2014   2:15pm - 2:30pm
  Synced Audio / Video / Slides

Four Dimensional (4D) X-ray Microscopy with a submicron beam size was used to follow the evolution of strains in off-stoichiometric NiMnGa twinned crystals near a type I (hard) twin boundaries under a magnetic field. A laminate A/B microstructure was revealed near the twin boundaries in the "A" variant. Large strain gradients were observed in the "C" variant in the immediate vicinity of the type I twin boundary: the lattice is under large tensile strains ~0.4% along the c- axes within the first micron. Distinct "a"and "b" lattice parameter evolution with temperature and magnetic field was demonstrated. In an applied magnetic field, the strain field was observed at larger distances from the twin boundary and became more complex. Stochastic twin boundary motion was observed after the magnetic field reaches a certain critical value. Research sponsored by the LDRD Program of Oak Ridge National Laboratory, U. S. Department of Energy.

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