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Lecture

Materials Characterization by Diffraction Techniques. X-rays, Neutrons, Synchrotron Radiation and EBSD: A Critical Assessment of their Capabilities and Relative Advantages.

Thursday (27.09.2018)
09:15 - 09:30 S1/01 - A02
Part of:


Large neutron and synchrotron radiation facilities have been available in Germany for many years. Neutron source availability is much older and more recently the bright synchrotron sources have been developed and are available for the international scientific community. Both kinds of sources have common as well as differential characteristics allowing to obtain complementary results. The current work describes a series of experiments and results obtained in a long history of collaboration between the Clausthal Technical University, Germany, and Rosario National University, Argentina, starting in 1996. The main neutron source was the already decommissioned Geesthacht Nuclear Reactor. Such reactor provided several neutron lines from which the main results for the collaboration came from Tex-2, a goniometer designed mainly for texture determinations. The superb penetration of neutrons allowed the inspection of large samples with averaging capabilities far superior to laboratory x-ray machines. Metals, rocks and composite materials were investigated and resulted in several publications combining experiments and simulations.

Later on the synchrotron source at DESY, Petra III, provided the opportunity of starting in-situ texture and microstructure analysis of deformed materials. Highly collimated and penetrating beams give the opportunity to inspect with high accuracy materials during tensile tests as well as under heat treatment.

Both sources provided results that, compared with laboratory x-ray results and, recently, EBSD experiments and incorporating computer modelling were quite profitable for materials science research in metals, alloys, composites, rocks, etc.

A few case studies, investigated along more than 20 years will show the capabilities of the different techniques for evaluating textures, microstructures and their interrelationship. Correlation between the methods will be shown, including the application of models and simulations to help on the understanding of the results.

Speaker:
Prof. Dr. Raúl Bolmaro
Universidad Nacional de Rosario - UNR
Additional Authors:
  • Dr. Martina Avalos
    Instituto de Física Rosario (IFIR) - CONICET - UNR
  • Prof. Dr. Heinz-Gunter Brokmeier
    Clausthal University of Technology; Helmholtz-Zentrum Geesthacht