Lattice swelling and modulus change in a helium-implanted tungsten alloy: X-ray micro-diffraction, surface acoustic wave measurements, and multiscale modelling F Hofmann, D Nguyen-Manh, MR Gilbert, CE Beck, JK Eliason, AA Maznev, W Liu, DEJ Armstrong, KA Nelson, SL Dudarev Acta Materialia 89 (2015) 352-363 Using X-ray micro-diffraction and surface acoustic wave spectroscopy, we measure latticeContinue reading “Helium: the gremlin in tungsten”
Last week Felix and Catherine travelled to ESRF, the European Synchrotron in Grenoble, to carry out diffraction measurements. They were joined by collaborator Professor John Huber. The experiment was among the last to be carried out on beamline ID15 as we know it: in 2015 this beamline will be completely rebuilt.
All of the parts for our new vacuum furnace have now arrived and we’re in the process of assembling it. Thanks to the Royal Society and EPSRC for providing the funding.
Isaure de Broglie, a former internship student in the group, has been awarded a prize at École Polytechnique, Paris, for the best research project in Mechanics. In Oxford she worked on “Helium Retention and Transport in Tungsten for Nuclear Fusion Applications”.
Nuclear fusion has the potential to provide a sustainable, environmentally friendly, reliable energy source. One of the main obstacles to commercial fusion energy is the availability of sufficiently resilient materials. Components in the first wall of a fusion reactor will be exposed to extreme temperatures, intense irradiation and ion bombardment. Tungsten and tungsten alloys areContinue reading “Fusion: Energy of the Future?”
Felix gives an invited talk on “Atomic Scale Crystal Defect Characterization using Micro Diffraction”. The talk concentrated on future opportunities for using metallic systems as proxies for defects in biocrystals. The X-ray Science workshop was hosted by the new Australian Research Council Centre of Excellence in Advanced Molecular Imaging.
Atomic scale defects play a key role in determining the mechanical and physical properties of material systems. In metals and alloys, defects such as dislocations control deformation and failure behaviour; in semiconductor devices they can be detrimental to electrical performance. Transmission electron microscopy (TEM) transformed our ability to understand and better control atomic scale defectsContinue reading “X-Ray Vision at the Atomic Scale”
Felix gives an invited talk at XRM 2014 on X-ray Measurements of Individual Dislocations. XRM is one of the major conferences on X-ray microscopy, bringing together the worldwide community. It’s an excellent opportunity to discover the most recent developments and challenges in the field.
High Energy Transmission Laue (HETL) is a new synchrotron X-ray diffraction technique we have recently developed. It allows the lattice distortion of individual grains within polycrystalline engineering components to be probed. Because it uses much higher photon energies than conventional micro-beam Laue diffraction, larger, real-life engineering components could be measured. Our research focuses on refiningContinue reading “High Energy Transmission Laue”
Lifetime of high-order thickness resonances of thin silicon membranes AA Maznev, F Hofmann, J Cuffe, JK Eliason, KA Nelson Ultrasonics DOI: 10.1016/j.ultras.2014.02.016 Femtosecond laser pulses are used to excite and probe high-order longitudinal thickness resonances at a frequency of ∼270 GHz in suspended Si membranes with thickness ranging from 0.4 to 15 μm. The measuredContinue reading “Phonon Lifetime in Silicone Membranes”