Microstructure Characterisation of Advanced Materials via 2D and 3D X-Ray Refraction Techniques

Abstract:

3D imaging techniques have an enormous potential to understand the microstructure, its evolution, and its link to mechanical, thermal, and transport properties. In this conference paper we report the use of a powerful, yet not so wide-spread, set of X-ray techniques based on refraction effects. X-ray refraction allows determining internal specific surface (surface per unit volume) in a non-destructive fashion, position and orientation sensitive, and with a nanometric detectability. We demonstrate showcases of ceramics and composite materials, where microstructural parameters could be achieved in a way unrivalled even by high-resolution techniques such as electron microscopy or computed tomography. We present in situ analysis of the damage evolution in an Al/Al₂O₃ metal matrix composite during tensile load and the identification of void formation (different kinds of defects, particularly unsintered powder hidden in pores, and small inhomogeneity’s like cracks) in Ti64 parts produced by selective laser melting using synchrotron X-ray refraction radiography and tomography.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 2401-2406
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.2401
• Online since: December 2018
• Authors: Bernd R. Müller*, Andreas Kupsch, René Laquai, Jens Nellesen, Wolfgang Tillmann, Galina Kapserovich, Giovanni Bruno
• Keywords: Additive Manufacturing (AM), Creep, CT, Damage Evolution, Metal Matrix Composites, Microscopy, Porosity, Radiography, Synchrotron X-Ray Refraction Radiography, Tomography, X-Ray Refraction

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