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Condensed Matter Physics Seminar


Grains, Strains and Plasticity

Mark Daymond
Canada Research Chair, Department of Mechanical and Materials Engineering, Queen's

Time
 
Wed. March 9, 2005     10:30 AM     Stirling 501

Abstract
 
Conventional x-ray or electron diffraction studies are typically limited to the study of near surface conditions. In contrast, neutron and high energy synchrotron x-rays are capable of penetrating significant distances into most materials, probing bulk material conditions. These tools have historically seen considerable use in studies on the influence of processing and fabrication routes on material properties, internal stress and phase fraction. More recently, there has been a sustained interest in the use of in situ studies within the diffracting beam to provide a direct insight into the micromechanical deformation mechanisms contributing to the bulk response of the sample, under user imposed environmental conditions. Combined with micromechanical modelling a great deal can be learnt regarding the way that the various mechanisms operate and interact, for example different slip modes, phase transformations, or domain re-orientation. While both neutrons and synchrotron x-rays probe bulk rather than surface properties, the two techniques provide different opportunities and different challenges for such experiments. The techniques and capabilities will be explored via examples of studies of the deformation of metal and ceramic polycrystals.

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