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Microscopy, Materials and Energy
When: 4.00pm Friday 11 November 2016
Where: L3, Andrew Wiles Building, University of Oxford
4.00pm Nick Schryvers (University of Antwerp)
Applications of novel electron microscopy techniques for the understanding of solid mechanics The lecture will cover a variety of examples in which novel transmission electron microscopy (TEM) techniques have been used to provide better understanding of the behaviour of solid materials, with the emphasis on mechanics. The effect of cyclic compression on single grain Ni micropillars is investigated with orientation imaging microscopy, showing the creation of dislocation walls and reorientation of subgrains. Short range ordering in a Ni-Ti shape memory alloy is quantified by the observation of diffuse diffraction intensity and related to the change in martensitic transformation temperature during low temperature cycling. The effect of hydrogen on the mechanical behaviour of nanocrystalline Pd is investigated by atomic resolution TEM and in-situ nanomechanical testing. Atomic shifts at interfaces in oxides are quantified by aberration corrected TEM in combination with statistical parameter estimation and the response
of polymer capsules in self-healing composite materials is described.
5.00pm Richard D James (University of Minnesota)
Materials and methods for the direct conversion of heat to electricity*
There are enormous reservoirs of energy stored on earth at small temperature difference, including natural sources such as the temperature difference between ocean (~0 C) and ambient (-40 to -20 C) in the arctic, focused sources such as solar-thermal arrays, and man-made sources like the waste heat from power plants, air conditioners, computers and hand-held electronic devices. The conversion of this heat to useable forms of energy challenges basic thermodynamic concepts. Any such conversion device is necessarily of low efficiency, but is efficiency relevant when one is not paying for the heat? Some heat engines are highly efficient, but their ability to absorb significant amounts of heat is limited. We present a new family of methods for the direct conversion of heat to electricity using phase transformations in multiferroic materials. The lecture will focus on the basic theory of energy conversion by phase transformation and mathematical questions that arise from the analysis of these methods.
*Part of a set of lectures provided by Prof James “Leverhulme Lectures on Mathematical Problems in Materials Science” with lecture 2 on Monday 14 November; lecture 3 Tuesday 15 November. See http://www.maths.ox.ac.uk/r/0 for full details
6.00pm Drinks Reception
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