MAVI Success Story -
Dr. Alexander Rack, ESRF

Fraunhofer Institute for Industrial Mathematics ITWM

Synchrotron-based microtomography and quantitative image analysis for the characterisation of heterogeneous multi-constituent specimens

The usage of intensive and hard synchrotron radiation for three dimensional imaging by means of microtomography permits the acquisition of low-noise volume images with additionally a high level of contrast. These tomographical images are an ideal basis for applying a quantitative, three dimensional image analysis. In particular, the strength of the combination of image analysis with synchrotron microtomography is outlined by examining the foaming behavior of commercial aluminium alloys in an early state of pore development. To enable the required reproducibility of the foam quality for a subsequent industrial utilization, it is necessary to understand the correlations which are predominant during the development of the first pores of a foaming metal.

MAVI was used to determine spatial cross-correlations in the volume images between the pore space and other material phases. Here, the location of the first pore development in an aluminium foam appeared to be influenceable by the composition of the precursor material. Hence, an easy realizable and robust method for optimizing the pore development in metal foam arose out of it.

Publications

  • C. Redenbach, A. Rack, K. Schladitz, O. Wirjadi, M. Godehardt
    Beyond imaging: on the quantitative analysis of tomographic volume data
    Int J Mater Res 2 (2012), pages 217–227
  • A. Rack, H.-M. Helwig, A. Bütow, A. Rueda, B. Matijasevic-Lux,
    L. Helfen, J. Goebbels, J. Banhart
    Early pore formation in aluminium foams studied by synchrotron-based
    microtomography and 3-D image analysis
    Acta Materialia 57 (2009) 4809–4821
  • A. Rack, L. Helfen, T. Baumbach, S. Kirste, J. Banhart, K. Schladitz, J.
    Ohser
    Analysis of spatial cross-correlations in multi-constituent volume data
    Journal of Microscopy vol. 232, issue 2, in print (2008)
  • L. Helfen, T. Baumbach, P. Pernot, P. Cloetens, H. Stanzick
    Investigation of pore initiation in metal foams by synchrotron-radiation
    tomography
    Applied Physics Lettre vol. 86, issue 23, 231907 (2005)