Bragg-edge Imaging with Neutrons: Prof. Dr. rer. nat. Manfred Hentschel to his 65th birthday

Nikolay Kardjilov; André Hilger; Ingo Manke; Francisco Garcia-Moreno; John Banhart

doi:10.3139/120.100922

Artikel

Bragg-edge Imaging with Neutrons

Prof. Dr. rer. nat. Manfred Hentschel to his 65^th birthday

Nikolay Kardjilov , André Hilger , Ingo Manke , Francisco Garcia-Moreno und John Banhart

Veröffentlicht/Copyright: 26. Mai 2013

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Abstract

Cold neutrons have a wavelength that is in the same range as the d_hkl spaces for polycrystalline metal materials. Therefore imaging of polycrystalline materials with monochromatic cold neutrons provides a unique contrast due to coherent Bragg scattering. Here, we present investigations of metallic materials with energy-selective neutron radiography around the Bragg-edges for polycrystalline materials. Polychromatic and monochromatic radiographic measurements of welded composite materials are shown. The results give interesting insights into the manufacturing process.

Kurzfassung

Die Wellenlänge kalter Neutronen liegt typischerweise zwischen 0,1 bis 1 nm, und damit auch im Bereich der Atom- bzw. Netzebenen-Abstände in Festkörpern. Radiographie und Tomographie mit kalten, monochromatischen Neutronen ermöglicht daher eine einzigartige Kontrastgebung, indem Messungen vor, hinter und an der Bragg-Kante eines Materials durchgeführt werden. Sobald die Wellenlänge der Neutronen eine der Bragg-Kanten des untersuchten Materials unterschreitet, findet aufgrund der Bragg-Streuung ein schlagartiger Einbruch in dem transmittierten Signal statt und gibt so Hinweise auf die kristalline Struktur des Materials. In diesem Beitrag werden die Möglichkeiten dieser Methode erläutert und einige Messbeispiele gezeigt.

Dr. rer. nat. Nikolay Kardjilov is responsible for the neutron tomography instrument CONRAD at Helmholtz Centre Berlin for Materials and Energy. Dr. N. Kardjilov studied Physics at Sofia University, Bulgaria, where he received his MSc degree. Thereafter he successfully completed his PhD work in the field of neutron tomography at the department of physical science at TU-Munich. In 2003 he moved to HZB, where he set up a new neutron tomography instrument. His research topics are the development and application of radiographic and tomographic techniques with neutrons.

Dipl. Ing. André Hilger is a PhD student with the research topic ‟Tomography with spin-polarised neutrons” and he is also responsible for the technical development of neutron tomography at HZB. He studied technical physics at the University of Applied Science (TFH) Berlin. After receiving his Bachelor degree he worked as a technician between 2001 and 2006 at HZB as well as at TFH. In 2006 he obtained his MSc degree at TFH.

Dr. rer. nat. Ingo Manke is a head of the imaging group in the materials department and a coordinator of the centre of industrial application at HZB. Dr. Manke studied physics at the Freie Universität Berlin. He finished his PhD at TU Berlin in 2002 in the field of scanning electron microscopy. Afterward he worked at Fraunhofer Institute for Reliability and Microintegration. Since 2003 he has worked at HZB with research interests in the development and application of radiographic and tomographic techniques with neutrons and x-rays.

Dr. rer. nat. Francisco Garcia-Moreno studied pysics at Georg-August-Universität, Göttingen, where he obtained his MSc in 1995. Afterward he worked as a researcher at the Zentrum für Funktionswerkstoffe GmbH in Göttingen. In 1999 he received his PhD at the Institut für Material Physik, Götingen in the field of high-temperature superconducting bands. Since 2002 he has been working as head of the metal foam group at HZB.

Prof. Dr. rer. nat. John Banhart has been head of the department materials since 2002, and head of the division of structural research since 2006 at HZB. He is a professor at the Institut für Werkstoffwissenschaften und -technologien at the Technischen Universität Berlin. Prof. Banhart studied Physics at the Ludwig-Maximilian-Universität München, and completed his PhD there in the field of physical chemistry. He worked at the Fraunhofer Institut für Fertigungstechnik und Materialforschung Bremen between 1991 and 2001, and was promoted to professor in solid state physics at the University of Bremen in 1998. In 2002 he moved to the HZB. His research topics are methods for the investigation of the structure and dynamics of materials, especially tomography, small-angle scattering with synchrotron, and neutron radiation.

References

1 S.Vogel: PhD. Thesis, available online at http://eldiss.uni-kiel.de/macau/receive/dissertation_diss_00000330 (2000).Suche in Google Scholar

2 See for more details: http://www-nds.iaea.org/exfor/exfor00.htmSuche in Google Scholar

3 W.Kockelmann, G.Frei, E. H.Lehmann, P.Vontobel, J. R.Santisteban: Energy-selective neutron transmission imaging at a pulsed source. Nucl. Instr. and Meth. A578 (2007), S. 421–434.Suche in Google Scholar

4 N.Kardjilov, S.Baechler, M.Basturk, M.Dierick, J.Jolie, E.Lehmann, T.Materna, B.Schillinger, P.Vontobel: New features in cold neutron radiography and tomography – Part II: applied energy-selective neutron radiography and tomography. Nucl. Inst and Meth. A501 (2003), S. 536–546Suche in Google Scholar

5 J. R.Santisteban, L.Edwards, A.Steuwer, P. J.Withers: Time-of-flight neutron transmission diffraction. J. Appl. Crystall.34 (2001), S. 289–297.10.1107/S0021889801003260Suche in Google Scholar

6 A.Steuwer et al: Bragg edge determination for accurate lattice parameter and elastic strain measurement. Phys. Stat. Solidi (A)185 (2001), S. 221–230.10.1002/1521-396X(200106)185:2<221::AID-PSSA221>3.0.CO;2-CSuche in Google Scholar

Published Online: 2013-05-26

Published in Print: 2008-10-01

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https://doi.org/10.3139/120.100922