SC9 Boris Straumal

Short Course on

“Interfacial Structure, Phase Transformations and Diffusion”
by Boris Straumal

10:00 – 10:30 Registration
10:30 – 11:30 Session 1. Grain boundary structure and faceting/roughening. Coincidence site lattice. Displacement shift lattice. Elementary units approach. Special and general boundaries (GBs). Areas of existence for the special and general boundaries. GB faceting/roughening as a reason for the special-to-general GB transformations. GB faceting in cubic and hexagonal lattices. GB roughening of first and second order. Influence on the GB mobility. GB ridges and critical points.
11:30 – 11:45 Coffee break
11:45 – 12:45 Session 2. Grain boundary wetting/devetting. Transition from incomplete to complete GB wetting by a liquid phase. GB wetting of first and second order. Transition from incomplete to complete GB wetting by a second solid phase. GB prewetting and premelting. Formation of GB prewetting and premelting phases. GB wetting by an amorphous phase. Wetting of an amorphous phase by the second amorphous phase.
12:45 – 14:00 Lunch break (lunch not included)
14:00 – 15:00 Session 3. Grain boundary adsorption and GB phases. Thin GB phases as a multilayer GB adsorption. GB adsorption and GB thin layers as reason for the accelerated diffusion, migration, electrical conductivity. Non-equilibrium GBs during deformation. GB cracks as “wetting by an emptiness”. GB ferromagnetic foam in ZnO and GaN. Shift of solubility lines in the bulk phase diagrams due to the GB adsorption in nanograined materials.
15:00 – 15:15 Coffee break
15:15 – 16:15 Session 4. Phase transformations and accelerated diffusion driven by the severe plastic deformation (SPD). Methods of SPD. Nanograined structure of alloys after SPD. Accelerated diffusion during SPD. Phase transformations during SPD: decomposition of a supersaturated solid solution, dissolution of phases, amorphization of crystalline phases, synthesis of the low-temperature allotropic modifications, and nanocrystallization in the amorphous matrix. Physical reason of these transformations. G. Martin’s idea of effective temperature.

Handouts

Copies and CD of all slides in the PowerPoint format will be provided at the beginning of the SC.

Speaker

Prof. Boris Straumal (55) is a head of Laboratory of Interfaces in Metals of the Institute of Solid State Physics, Russian Academy in Sciences (ISSP RAS) in Chernogolovka near Moscow. He is also part-time professor at the National University of Research and Technology “MISiS”, Moscow Lomonosov University (Faculty of Physical Chemistry) and at the Moscow Institute of Physics and Technology (State University).

Prof. Boris Straumal holds PhD degree in physics and mathematics at the Moscow Institute of Steel and Alloys (MISiS, Russia) and a DSc in physics and mathematics in ISSP RAS, Chernogolovka. His research interests include interfacial phenomena, nanograined materials, phase transformations driven by the severe plastic deformatio. He has authored more than 240 papers, received more than 1600 citations, his H-factor is 23. He served as visiting professor at the Comahue University (Neuquen, Argentina), TECHNION – Israel University of Technology (Haifa, Israel), University of Valencia (Valencia, Spain), Institute of Metallurgy and Materials Science (Cracow, Poland), Chalmers University of Technology (Gothenburg, Sweden), Tohoku University (Sendai, Japan), Masaryk University (Brno, Czech Republik), Kumamoto University (Kumamoto, Japan). Earlier versions of a similar course were presented by him in Cracow (1999), Sendai (2003), Brno (2006) and Kumamoto (2009).