Guest Speaker: Domonkos Tolnai, MagIC – Magnesium Innovation Centre, Germany
Thursday, October 9 – 1:00 PM
Frank Foward 303
The development of the detector systems and the high brilliance of the X-ray beam at synchrotron sources allow to perform in situ solidification and deformation studies of engineering materials.
Mg-RE (Rare Earth) alloys are attractive for structural as well as for biomedical applications due to the combination of good mechanical and corrosion properties. These macroscopical properties of multiphase materials depend strongly on the chemical composition, volume fraction and spatial distribution of the intermetallic phases. Although the thermodynamic databases and binary phase diagrams provide information on the presumed solidification paths of the simple alloy systems, for complex phases the information in the simulation databases is limited. Recording the diffraction patterns while cooling the alloy system down, allows identifying 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 their further development.
ZK alloys are one of the high strength cast alloys earlier available, however, they possess poor ductility. The addition of RE metals to these alloys improves castability and elevated temperature strength. Furthermore they weaken the anisotropy thus improve the ductility of Mg alloys. In situ diffraction is a unique method to investigate the dynamic microstructural processes during elevated temperature mechanical loading. It gives information about the size and orientation of the grains, twinning and recrystallization. The post mortem SEM-EBSD investigation of the samples completes the information on the deformation behavior of these materials.
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