[Back]

D. Tolnai, G. Requena, A. Stark, N. Hort:
"In situ characterization of solidification by synchrotron radiation";
Talk: MagNET Research Network Workshop - Solidification of Magnesium Alloys, Montreal - Canada; 11-05-2012 - 11-06-2012.

The macroscopic mechanical properties of multiphase materials depend strongly on the chemical composition, volume fraction and spatial
distribution of the internal phases which are determined during solidification. Therefore the understanding of the sequence of formation and
evolution of the internal phases during solidification is a prerequisite to achieve control of the microstructure of these alloys. The
thermodynamic databases and binary phase diagrams provide information on the presumed solidification path. The majority of the commercial
Mg alloys are not binary, but complex alloys with more, than one alloying addition. For these materials the information in the simulation
databases is limited.
The continuous development of the X-ray acquisition systems and the high brilliance of the beam at synchrotron sources provide a unique tool
to characterize the phase formation and evolution during the solidification in situ. Recording the diffraction patterns while cooling the system
down, allows to identify the internal phases, to determine their solidification sequence and to use these results as experimental validation of the
existing thermodynamic databases and in certain cases contribute to the completion of them.