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        COLLOQUIUM OF THE COMPUTATIONAL MATERIALS SCIENCE CENTER
                   School of Computational Sciences
                           (CSI 898-Sec 001)
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  Motion of individual grain boundaries and triple junctions in metals

                          Vladimir Ivanov
  School of Computational Sciences, George Mason University, Fairfax, VA

The motion of grain boundaries determines microstructure evolution during 
annealing in metals. The contiguous arrangement of grains in polycrystals 
requires that their interfaces are connected, i.e. form junctions. So far all 
peculiarities of the behavior of polycrystals were traditionally attributed 
to the motion of grain boundaries and the role of triple junctions was 
neglected. Recent studies revealed that triple junctions can change the 
course of microstructure evolution. Experiments on polycrystals can only 
yield averaged data on grain boundary and triple junction mobility. The 
specific problems of grain structure evolution ­ structural, impuriity, 
pressure and driving force dependence of grain boundary and triple junction 
mobilities can, therefore, be addressed only in experiments on individual 
grain boundaries and triple junctions. Some recent developments in 
experimental research on grain boundary and triple junction migration are 
reviewed. An experimental technique (X-Ray Interface Continuous Tracking and 
Back-Scattered Electron Diffraction) for in-situ study of the motion of 
interfaces is introduce.
                         
                        April 3, 4:30 pm
               Room 206, Science & Tech. I, Fairfax Campus

Refreshments will be served at 4:15 PM.
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Find the schedule at http://www.cmasc.gmu.edu/seminar/schedule.html
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