The 7th International Congress on 3D Materials Science (3DMS 2025): 3D Imaging at the Nano-Scale
Program Organizers: Henry Proudhon, Mines Paris Centre Des Materiaux; Can Yildirim, European Synchrotron Radiation Facility

Wednesday 3:30 PM
June 18, 2025
Room: Platinum Ballroom 2
Location: Anaheim Marriott

Session Chair: William Chen, Nswc Carderock

3:30 PM  Invited
Characterizing Nanoscale Ordering Using Bragg Coherent Diffraction Imaging: Nathan Warren1; Chloe Skidmore1; Wonsuk Cha2; Katherine Harmon2; Jon-Paul Maria1; Stephan Hruszkewycz2; Darren Pagan1; 1Pennsylvania State University; 2Argonne National Laboratory
    The amount of local ordering in many metallic alloys is sensitive to the thermal processing route that they have undergone. Of current importance for alloy design is controlling this ordering to optimize an alloy’s mechanical properties for a desired application. However, before ordering can be controlled, new means to quantitatively characterize its presence are needed as this remains an on-going challenge. In this study, we use Bragg coherent diffraction imaging to reconstruct morphology and lattice displacement in model Cu3Au nanocrystals (~10 nm spatial resolution) that have been heat-treated at temperatures below, within, and above the order-disorder transition temperature range. The magnitudes and distributions of the scattering amplitudes (proportional to electron density) and lattice strains within these crystals are then analyzed to correlate them to the expected amount of short-range ordering present.

4:00 PM  
Application of a Multilayer Laue Lens for Full-Field Tomography and DFXM: Nis Gellert1; Steffen Staeck1; Henning Friis Poulsen1; Carsten Detlefs2; Can Yildirim2; Innokenty Kantor3; Rajmund Mokso1; 1DTU; 2ESRF; 3MAX IV
     Multilayer Laue lenses (MLL) are diffraction-based X-ray optics that are especially suitable for the hard X-ray range. They exhibit a larger numerical aperture, NA, than compound refractive lenses and conventional Fresnel zone plates. In this work, we first present the implementation and characterization of an MLL at the DanMAX tomography beamline at MAX IV. Here the MLL is used for tomography via phase-contrast projection holography for materials science and bio-imaging. Coupled with a 150 Mpixel camera in the so-called Xtreme-CT setup, a large field-of-view (2 mm) is coupled with high spatial resolution (100 nm).Next, we present the plans and status for implementing an MLL as an objective at the dedicated DFXM beamline ID03 at ESRF. Here the aim is to improve the spatial resolution to 30 nm. In addition, the larger NA will also improve data acquisition speed.

4:20 PM  
Synchrotron X-Ray Nanotomography Uncovers Microstructure of a Three-Phase Eutectic Solidified in Microgravity: Soumyadeep Dasgupta1; Xianghui Xiao2; Melis Serefoglu3; Ulrike Hecht4; Ashwin Shahani1; 1University of Michigan; 2Brookhaven National Laboratory; 3Marmara University; 4Access e.V.
    Microstructure selection of two-phase eutectics is reasonably well understood, but the same cannot be said about three-phase eutectics. Our study aims to advance fundamental understanding of pattern formation in the Al-Ag-Cu system during invariant eutectic solidification. Using synchroton x-ray nanotomography with high spatial resolution (~50 nm), we investigate in 3D the microstructural arrangement of α(Al), Ag₂Al, and Al₂Cu eutectic phases following directional solidification (DS) under diffusive conditions in a microgravity environment aboard the International Space Station. With the wealth of 3D data, we quantify various attributes of the three-phase pattern during a velocity jump in DS: the phase fractions, eutectic length scales, phase connectivities, and interfacial shapes. Our research offers new insights into the selection of eutectic morphology and topology under DS, with implications to a wide array of multi-phase systems.

4:40 PM  
Microstructural Influences on Crystal Plasticity Model Predictions Using High Energy X-Ray Diffraction Microscopy and TriBeam Tomography: Justine Schulte1; Dalton Shadle2; James Lamb1; McLean Echlin1; Kelly Nygren2; Matthew Miller2; Tresa Pollock1; Irene Beyerlein1; 1University of California, Santa Barbara; 2Cornell University
    High energy x-ray diffraction microscopy (HEDM) is a valuable technique to study deformation in polycrystals as it provides 3D microstructure reconstructions and time-resolved micromechanical data. In the literature, this technique has been paired with full field models by providing initial microstructures and fine-scale validation. However, it is known that HEDM cannot consistently resolve small grains and twins, which arises as a consideration when interpreting results and a possible source of discrepancy in validation efforts when paired with microstructure-sensitive models in FCC materials. To quantify how missing features affect predicted values, a SEM-based TriBeam tomography dataset was collected on an IN718 sample that was monitored during a loading experiment using near-field and far-field HEDM. These overlapping reconstructions will be used to quantify differences in the captured grains. Additionally, crystal plasticity finite element (CPFE) simulations will be run with both reconstructions to observe any deviations in predicted values due to microstructural differences.

5:00 PM  
3D-EBSD Characterization of the Microstructure Around a Crack Initiation on an Inconel 718DA Fatigue Sample: Frederic Adamski1; Florent Coudon1; Ditoma Satera2; Henry Proudhon2; 1Safran; 2Centre des Matériaux - Mines de Paris - PSL
     Inconel 718DA is an alloy widely used in the aerospace industry for manufacturing high-pressure turbine discs, for which damage results from fatigue stresses. Fatigue crack initiation remains a mechanism that needs to be studied to improve our understanding. To this end, an interrupted fatigue test was carried out on a specimen with a flat surface in order to initiate a large number of short cracks with a length of a few tens of micrometers. One of these cracks was then selected for full EBSD-3D FIB-SEM characterization of the microstructural volume in its vicinity. This talk will first focus on the protocol for generating, identifying and preparing the crack to be characterized. Next, the steps involved in reconstructing the volume from the 2D slices will be explained. Finally, the analysis of the microstructure and the crack path will provide further insight into the fatigue damage mechanisms of this alloy.