Prof. Tamas UNGAR (Professor Emeritus at the Department of Materials Physics, Eötvös University Budapest, Hungary): Invited professor


Prof. Tamas Ungar is a world class expert in the use of diffraction line broadening for defect structure analysis in crystalline materials. He established a school around him in this topic from about 1982. He is now with us for a period of three months from the beginning of September until the end of November, 2015. He is located in the LEM3 component of the Labex DAMAS, in Metz. Contact: ungar@ludens.elte.hu.

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Professor T. Ungar obtained his PhD in 1980 at the Eötvös University Budapest in Hungary. After that he was a postdoctoral fellow as Humboldt stipend holder at the Max-Planck-Institute of Metallforschung in Stuttgart Germany in the group of Dr M. Wilkens and Prof. A. Seeger. In 1988 he obtained the Dr of Science (DSc) title issued by the Hungarian Academy of Science. Since then he is full professor at the Materials Science Department of the Eötvös University Budapest in Hungary. In his PhD he studied the GP zone formation in Al-base alloys and worked out the model for the interaction between GP zones and more stable precipitates in this alloy system. In Stuttgart he discovered the characteristically asymmetric X-ray line broadening and gave direct evidence for the long-range internal stresses prevailing in heterogeneous dislocation structures. Together with H. Mughrabi and M. Wilkens he substantiated the composite model of heterogeneous dislocation structures. Since 1980 he is working on high-resolution diffraction line broadening, a powerful method for characterizing the substructure of crystalline materials in terms of different types of lattice defects, especially dislocations, crystallite size and planar faults. In 2007 he obtained the Hanawalt award from ICDD for the dislocation model of strain anisotropy. In 2008/2009 he was awarded by the Humboldt Research Prize to work at different institutes in Germany. He published over 240 research papers and has more than 7000 citations with H=42.