4D evaluation of grain shape and fatigue damage of individual grains in polycrystalline alloys by diffraction contrast tomography using ultrabright synchrotron radiation
| Autor: | Daiki Shiozawa, N. Masada, Yoshikazu Nakai, Ryotaro Miura, Ryota Nakao, Shota Matsuda |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Diffraction Materials science business.industry Mechanical Engineering Synchrotron radiation 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Rotation 01 natural sciences Industrial and Manufacturing Engineering Mosaicity Optics Mechanics of Materials Modeling and Simulation 0103 physical sciences Ultimate tensile strength engineering General Materials Science Crystallite Dislocation Austenitic stainless steel 0210 nano-technology business |
| Zdroj: | International Journal of Fatigue. 82:247-255 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2015.07.014 |
| Popis: | A three dimensional grain mapping technique for polycrystalline materials, called X-ray diffraction contrast tomography (DCT), was developed at SPring-8 ( S uper P hoton ring – 8 GeV), which is the brightest synchrotron radiation facility in Japan, and the measurement conditions and data acquisition procedure are discussed. The developed technique was applied to a commercially pure aluminum, commercially pure iron, and austenitic stainless steel. The shape and location of grains could be determined by DCT using the apparatus in a bending beam line of SPring-8. To evaluate the dislocation structure in tensile tests and fatigue tests, the rotation angle spread of individual grains was measured. The rotation angle spread is caused by mosaicity, which is related to the dislocation structure in a grain. The rotation angle spread was found to increase with increasing plastic strain. Fatigue damage could also be evaluated from the rotation angle spread obtained by DCT measurement. |
| Databáze: | OpenAIRE |
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