Center Line Segregation in Twin-Roll Cast AZ31 Magnesium Alloy
M. Ziminaa, M. Šlapákováb, J. Bohlenc, D. Letzigc, G. Kurzc, S. Zaunschirmd, J. Kastnerd, M. Cieslarb
aResearch Center Rez., Hlavní 130, 25068, Husinec-Řež, Czech Republic
bCharles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 12116, Prague, Czech Republic
cMagnesium Innovation Centre (MagIC) Helmholz Zentrum Geesthacht, D21502 Max-Planck Str. 1, Geesthacht, Germany
dUniversity of Applied Sciences Upper Austria, Stelzhamerstr. 23, 4600 Wels, Austria
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A three-dimensional approach to microstructural investigations was for the first time applied to a continuous cast material in order to understand solidification processes and liquid flow during casting. A twin-roll cast AZ31 magnesium alloy strip was subjected to observations by light optical microscopy, electron microscopy, and X-ray microtomography. The last one is found to be the only suitable for the 3D characteristic of the segregation channels containing Mn and Al-rich primary phases located in the central zone of the strip. It was shown that a reliable three-dimensional image of the volume containing central line segregation cannot be obtained using conventional metallographic methods, whereas X-ray microtomography allows the complete reconstruction of major features of the central segregation in the alloy.

DOI:10.12693/APhysPolA.134.774
PACS numbers: 61.72.Dd, 61.72.Ff, 61.72.Qq, 61.66.Dk, 81.05.Zx