Neutron tomography technique reveals phase fractions of crystalline materials in 3-dimensions

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The method overcomes limitations of existing techniques which are limited to the surface or small-sized specimens, and allows a 3-D representation of the phase fractions within the sample volume. The work has just been published in the journal “Advanced Materials“. Reconstructed energy-selective neutron tomography: This is a visualization of austenite and martensite distribution in torsion (two images to left) and tensile (image to the right) loading. “For many engineering applications it is of major importance to characterize the bulk of materials spatially, instead of only probing selected locations. The new method provides exactly that capability, and the HZB-UTK team has demonstrated it by using samples made from stainless steel that undergo a phase transformation after being subjected to tensile and torsional deformation.”, said Prof. Dayakar Penumadu from UTK. He and UTK Ph.D. student Robin Woracek collaborated with the researchers Ingo Manke, Nikolay Kardjilov and André Hilger from the Imaging Group at the Institute of Applied Materials (F-IAM) at HZB on establishing new quantitative imaging methods by making use of diffraction contrast due to Bragg scattering in polycrystalline materials. Since the measurement method uses neutrons of selected wavelengths, the current work will also pave the way to implement such methods at

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