Indentation creep surface morphology of nickel-based single crystal superalloys |
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Authors: | Baoxing Xu Akio Yonezu Zhufeng Yue Xi Chen |
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Affiliation: | aColumbia Nanomechanics Research Center, School of Engineering and Applied Sciences, MC 4709, Columbia University, New York, NY 10027-6699, USA;bDepartment of Engineering Mechanics, Northwestern Polytechnical University, Xi’an 710072, PR China;cDepartment of Mechanical Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan |
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Abstract: | The crystallographic orientation dependence of surface morphology of indentation creep on a nickel-based single crystal superalloy is investigated by using crystal plasticity slip theory with a three-dimensional (3D) finite element model. The numerical results show that the pile-up patterns developed around the indentation imprint exhibit four-, two-, and threefold symmetry on the surfaces of 0 0 1]-, 0 1 1]-, and 1 1 1]-oriented single crystals, respectively. The evolution of radial and hoop stresses around the crater provides important information for possible radial crack nucleation, whose critical locations depend on crystallographic orientations. These characteristics can be well explained in the viewpoint of crystallographic anisotropy. The findings may shed some light on understanding of the crystal structures and its time-dependent deformation mechanisms with the indentation method. |
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Keywords: | Indentation creep Nickel-based superalloys Single crystal Crystal plasticity Fracture Finite element method |
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