Speaker
Mr
Henry Kirkwood
(ARC COE Advanced Molecular Imaging - La Trobe University)
Description
Recent advances in neutron detection technology are enabling collection of neutron transmission data with unprecedented spatial and time resolution [1,2]. Microchannel plates coupled with TimePix area detectors are now being used to perform time-of-flight neutron radiography experiments at 55 micron2 spatial resolution and 1 &mus temporal resolution. These sensors are suited to a diverse range of neutron studies such as microtomography of material composition or phase and strain tomography [2,3,4].
In neutron time-of-flight transmission experiments each neutron arriving at the detector is tagged with its arrival time, this allows the determination of the energy-resolved transmission spectrum from the known time structure of the incident pulse. Variation of these transmission spectra can be used to obtain spatially-resolved maps of projected crystallographic properties within polycrystalline materials; such as average elastic strain, plastic strain, texture and grain size distributions.
Here, we present results from a recent experiment at the Engin-X beamline, ISIS, UK. The transmission spectrum of an additively manufactured jet engine turbine blade was measured and used to determine spatially-resolved maps of the average elastic strain in the transmission direction. This is a sample of intrinsic scientific interest due to questions that remain about the residual strains imparted during fabrication compared to those manufactured conventionally.
[1] Tremsin et al. Nuc. Instr. Meth. Phys. A 2012
[2] Zhang et al. Mat. Today 2009
[3] Abbey et al. Procedia Engineering 2009
[4] Kirkwood et al. Trans. American Crystallographic Association 2013
| Keywords or phrases (comma separated) | Strain mapping, Neutron tomography, Neutron Bragg-edge transmission, Residual strain |
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Primary author
Mr
Henry Kirkwood
(ARC COE Advanced Molecular Imaging - La Trobe University)
Co-authors
Prof.
Alexander Korsunsky
(Oxford University, Oxford, UK)
Dr
Anton Tremsin
(Space Sciences Laboratory, University of California, Berkely, USA)
Dr
Brian Abbey
(ARC COE Advanced Molecular Imaging)
Dr
Shu Yan Zhang
(Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell, Oxfordshire, UK)
