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2 results on '"Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB)"'

1. Friedel-pair based indexing method for characterization of single grains with hard X-rays

Author

Ar Pyzalla, Thomas Lippmann, András Borbély, Peter Kenesei, M. Moscicki, Jonathan P. Wright, Haroldo Cavalcanti Pinto, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Gesellschaft, Inst Phys, Dept Mat Phys, Eötvös Lorand University, Eötvös Loránd University (ELTE)-Eötvös Loránd University (ELTE), European Synchrotron Radiation Facility (ESRF), GKSS Research Centre, GKSS Research Centre (GKSS), Helmholtz-Zentrum Geesthacht (GKSS)-Helmholtz-Zentrum Geesthacht (GKSS), Centre Science des Matériaux et des Structures (SMS-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), UMR 5146 - Laboratoire Claude Goux (LCG-ENSMSE), Département Microstructures et Propriétés Mécaniques (MPM-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SMS, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, France, GKSS Forschungszentrum Geesthacht GmbH, D-21502 Geesthacht, Helmholtz Zentrum Energie & Mat GmbH, D-14109 Berlin, Germany, Eotvos Lorand Univ, Inst Phys, Dept Mat Phys, H-1518 Budapest, Hungary, European Synchrotron Radiat Facil, and F-38043 Grenoble

Subjects
STRAIN, Materials science, 02 engineering and technology, Friedel-pair, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Optics, DEFORMATION, Position (vector), POLYCRYSTALS, Orientation (geometry), 0103 physical sciences, General Materials Science, Texture (crystalline), LATTICE ROTATIONS, Crystallographic orientation change INDIVIDUAL BULK GRAINS, 010302 applied physics, business.industry, Mechanical Engineering, 021001 nanoscience & nanotechnology, Condensed Matter Physics, In situ testing, X-ray diffraction, Computational physics, Characterization (materials science), Reflection (mathematics), Mechanics of Materials, GROWTH, METALS, Center of mass, Crystallite, Symmetry (geometry), 0210 nano-technology, business
Abstract

International audience; A new evaluation procedure is presented to characterize the orientation and position of single grains within the bulk of a polycrystalline sample. Considering the symmetry properties of Friedel-pairs the contributions to reflection spot positions arising from grain orientation and position could be clearly separated. The proposed method avoids simultaneous fitting of all grain parameters with the goal of a higher accuracy. Depending on the number of reflections considered the accuracy of grain orientation may be less than 0.1 degrees, and the position of the center of mass of the grains can be accurate within one-third of the pixel size.

Published
2009
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2. Crystal and magnetic structure temperature evolution in Ni–Mn–Ga magnetic shape memory martensite

Author

I. Urubkov, F. Bourdarot, I. Glavatskyy, J.-U. Hoffman, N. Glavatska, Institute of Physics of NAS of Ukraine, National Academy of Sciences of Ukraine (NASU), Hahn-Meitner Institut (HMI), Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), Magnétisme et Diffusion Neutronique (MDN), Modélisation et Exploration des Matériaux (MEM), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Recherche Fondamentale sur la Matière Condensée (DRFMC), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Magnetic shape memory, Materials science, Condensed matter physics, Magnetic structure, Mechanical Engineering, Alloy, Neutron diffraction, Crystal structure, Electronic structure, engineering.material, Condensed Matter Physics, Condensed Matter::Materials Science, Crystallography, Magnetic shape-memory alloy, Mechanics of Materials, Martensite, engineering, General Materials Science, Ni−Mn−Ga, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Anisotropy
Abstract

Proceedings of the 7th European Symposium on Martensitic Transformations, ESOMAT 2006; The current work presents the original results concerning the temperature evolution of the magnetic and crystal structure of Ni−Mn−Ga magnetic shape memory alloys within the entire temperature interval of the martensite phase. The atomic positions and the correct space group of the 5M martensite unit cell has been derived, which is crucial for the electronic structure calculations. Neutron diffraction studies of the Ni−Mn−Ga alloy, possessing a large magnetic shape memory effect (>5% shear strain), revealed that there are several magnetic transitions in the martensite phase due to the smooth strongly anisotropic temperature dependence of the martensite lattice parameters.

Published
2008
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