Quantifying microscale drivers for fatigue failure via coupled synchrotron X-ray characterization and simulations

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...

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Bibliographic Details
Published in:Nature communications 2020-06, Vol.11 (1), p.3189-3189, Article 3189
Main Authors: Gustafson, Sven, Ludwig, Wolfgang, Shade, Paul, Naragani, Diwakar, Pagan, Darren, Cook, Phil, Yildirim, Can, Detlefs, Carsten, Sangid, Michael D.
Format: Article
Language:English
Subjects:
639/301/1023/1026
639/301/1023/303
639/301/930/12
Computer simulation
Crack initiation
Crack propagation
Crystallography
Cyclic loads
Deformation
Engineering Sciences
Fatigue
Fatigue failure
Fracture mechanics
Humanities and Social Sciences
Localization
Materials
Metal fatigue
Microscopy
Microstructure
Misalignment
multidisciplinary
Nickel
Nickel base alloys
Polycrystals
Science
Science (multidisciplinary)
Strain
Superalloys
Synchrotron radiation
Twin boundaries
X ray microscopy
X-ray diffraction
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Summary: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. Structural alloys have distinct microstructural features known as twins that are preferential sites for fatigue crack initiation and need to be better understood to mitigate catastrophic failures. Here, the authors show unusually large stress gradients near a twin boundary, using X-ray techniques and modelling.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-16894-2