Metal grain structure resolved with table-top micro-tomographic system

0368623 - ÚTAM 2012 RIV GB eng J - Journal Article
Vavřík, Daniel - Soukup, P.
Metal grain structure resolved with table-top micro-tomographic system.
Journal of Instrumentation. Roč. 6, č. 11 (2011), s. 1-7. ISSN 1748-0221. E-ISSN 1748-0221.
[International workshop on radiation imaging detectors /13./. Zurich, 03.07.2011-07.07.2011]
R&D Projects: GA ČR(CZ) GA103/09/2101
Grant - others:GA MŠk(CZ) LC06041
Program: LC
Institutional research plan: CEZ:AV0Z20710524
Keywords : inspection with X-rays * computerized tomography * detection of defects * ellipsoidal beam
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 1.869, year: 2011
http://iopscience.iop.org/1748-0221/6/11/C11034/

X-ray transmission radiograms of Aluminum alloy contain relatively low contrast features induced by variations of the material chemical composition. Generally, these variations are strongly connected with grains of the metal, where these differ from each to other. Although grains of the studied material have typically dimensions of tens of micrometers only, the material variations can enable the observation of geometry and orientations of grains in the specimen volume employing advanced X-ray micro tomographic method. Analysis of such tiny structures requires high dynamic range of acquired radiograms with high signal to noise ratio and appropriate geometrical magnification. These requirements can be fully satisfied by using the pixelated single photon counting device Medipix, a precise micro-tomographic setup and appropriate data processing. Results will be demonstrated with an Aluminum alloy bar specimen.
Permanent Link: http://hdl.handle.net/11104/0202918