Berlin 2005 – scientific programme
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M: Metallphysik
M 46: Symposium Tomographic Methods in Materials Research
M 46.1: Talk
Tuesday, March 8, 2005, 17:00–17:20, TU H1058
Detection of texture alteration in Al parts using Neutron Computed Tomography — •Burkhard Schillinger1, Johannes Brunner1, Roland Gähler2, Martin Mühlbauer1 und Michael Schulz1 — 1TU München - FRM-II, 85747 Garching — 2Institut Laue-Langevin, F-38042 Grenoble
Neutron Computed Tomography has been developed to higher and higher sensitivity during the past years. At the research reactor FRM II of Technische Universitaet Muenchen, texture alterations caused by stress in Aluminium parts have been detected for the first time in a large measuring volume using Neutron Computed Tomography. By mechanical deformation, local stress and texture alterations were introduced into Aluminium plates. The altered texture lead to increased small angle scattering, which causes more beam attenuation in large distance between sample and detector. The new method can be used as large-volume pre-examination for quantitative measurements with the Neutron Stress Spectrometer in order to predetermine the areas which should be examined more closely. A Neutron Tomography of a sample of 20 cm size can be measured in about two hours, while a blind scan of the volume on the stress spectrometer may take several days. By preselection of the volumes to be measured, the efficiency of the stress spectrometer can be increased by orders of magnitude.