Speaker
Description
Polarised neutron imaging is a well-established powerful technique for investigating magnetic properties of samples [1-3]. By making use of the intrinsic magnetic moment of the neutrons, a magnetic field in and around a sample can be visualised as alterations on the transmitted neutron beam. This method is based on the spatially resolved measurement of cumulative precession angles of a collimated, polarised, monochromatic neutron beam going through a magnetic field. The very high neutron flux at NeXT@ILL is employed to achieve high resolution and a good signal-to-noise ratio with reduced acquisition time. This allows for investigation of phase transitions in bulky materials and provides sensitivity to current density changes in renewable power sources and energy storage systems like fuel cells, batteries and capacitators. In this contribution, we present a tomography done with polarised neutrons on an additive manufacturing sample which has previously been transformed mechanically, inducing a plastic deformation [4,5]. The aim of the study is the quantification of the proportion of austenitic to martensitic steel derived from the different magnetic behaviour of the two metallic phases.
| Abstract Topic | Development of experimental techniques and new principles |
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