TY - JOUR
T1 - Quantifying microscale drivers for fatigue failure via coupled synchrotron X-ray characterization and simulations
AU - Gustafson, Sven
AU - Ludwig, Wolfgang
AU - Shade, Paul
AU - Naragani, Diwakar
AU - Pagan, Darren
AU - Cook, Phil
AU - Yildirim, Can
AU - Detlefs, Carsten
AU - Sangid, Michael D.
N1 - Funding Information:
This work was supported by the National Science Foundation under CMMI 16-51956. Travel support for S.G., D.N., and M.S. was provided by the Defense Advanced Research Projects Agency under N66001-14-1-4041 and HR0011-12-C-0037. We acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities and we would like to thank Mustafacan Kutsal for his assistance in the experiment. In situ high energy X-ray microscopy was performed at the Cornell High Energy Synchrotron Source (supported by the National Science Foundation under DMR-1829070), with beamline support provided by Dr. Peter Ko. The authors would like to thank both Dr. Jake Hochhalter and Dr. Andy Newman for plasma-FIB work, Basil Blank for pedestal manufacturing, Dr. Sirina Safriet for help with specimen extraction, John Rotella for sample polishing and EBSD analysis, Dr. Bill Musinski for providing material, and Dr. Ricardo Lebensohn and Dr. Andrea Rovinelli for providing the original and parallelized CP-FFT algorithm, respectively. P.S. acknowledges support from the Materials & Manufacturing Directorate and the Air Force Office of Scientific Research (program manager Jay Tiley) of the U.S. Air Force Research Laboratory.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - During cyclic loading, localization of intragranular deformation due to crystallographic slip acts as a precursor for crack initiation, often at coherent twin boundaries. A suite of high-resolution synchrotron X-ray characterizations, coupled with a crystal plasticity simulation, was conducted on a polycrystalline nickel-based superalloy microstructure near a parent-twin boundary in order to understand the deformation localization behavior of this critical, 3D microstructural configuration. Dark-field X-ray microscopy was spatially linked to high energy X-ray diffraction microscopy and X-ray diffraction contrast tomography in order to quantify, with cutting-edge resolution, an intragranular misorientation and high elastic strain gradients near a twin boundary. These observations quantify the extreme sub-grain scale stress gradients present in polycrystalline microstructures, which often lead to fatigue failure.
AB - During cyclic loading, localization of intragranular deformation due to crystallographic slip acts as a precursor for crack initiation, often at coherent twin boundaries. A suite of high-resolution synchrotron X-ray characterizations, coupled with a crystal plasticity simulation, was conducted on a polycrystalline nickel-based superalloy microstructure near a parent-twin boundary in order to understand the deformation localization behavior of this critical, 3D microstructural configuration. Dark-field X-ray microscopy was spatially linked to high energy X-ray diffraction microscopy and X-ray diffraction contrast tomography in order to quantify, with cutting-edge resolution, an intragranular misorientation and high elastic strain gradients near a twin boundary. These observations quantify the extreme sub-grain scale stress gradients present in polycrystalline microstructures, which often lead to fatigue failure.
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U2 - 10.1038/s41467-020-16894-2
DO - 10.1038/s41467-020-16894-2
M3 - Article
C2 - 32581264
AN - SCOPUS:85086887283
VL - 11
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 3189
ER -