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   COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS        
                   School of Computational Sciences	
                           (CSI 898-Sec 001) 
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     Microstructural Observations and Thermodynamic Evaluation 
                 of Interfacial Reaction Products
                         Altaf H. Carim
            Dept. Materials Science & Engineering, The 
         Pennsylvania STate University, University Park, PA

At high temperatures, interfacial reactions are critical to materials
behavior and performance in a wide variety of circumstances.  In this
seminar, two types of systems will be discussed: the joining of ceramic
components by active metal brazing, and the effects of cyclic oxidation on
thermal barrier coatings.  The compositions and morphologies of the
interfacial regions in each case can most readily be assessed by
examination of cross-sections using scanning electron microscopy, electron
microprobe, and transmission electron microscopy.  New techniques, such as
focused ion beam milling, have substantially enhanced our capabilities to
perform such studies.  The appplicability and limitations of equilibrium
thermodynamics in explaining the observed structures will also be discussed.

                         Monday , October 29, 2001
                                  4:30 pm
                        Room 206, Science & Tech. I

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