Measurement of residual strain in An AlSiCw composite using convergent-beam electron diffraction |
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| Affiliation: | 1. College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;2. WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6102, Australia;3. Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;4. School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300350, China;5. Fujian College Association Instrumental Analysis Center, Fuzhou University, Fuzhou, Fujian 350108, China;1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;4. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Residual strains were introduced into an Al SiCw composite by in situ cooling a thin foil from room temperature to -160°C. A detailed analysis was conducted using convergent-beam electron diffraction (CBED) to quantify the elastic residual stresses and strains in the matrix near the end and side of a SiC whisker. Large hydrostatic and effective stresses were measured in the matrix near the side of the whisker; the maximum stresses were located near the Al/SiCw interface and decreased to zero approximately 1 μm (∼2 whisker diameters) from the interface. Residual strains were also observed in the matrix near the whisker end, but these strains could not be measured due to the complexity of the strain field. At the whisker end, the largest residual strains were located near the Al/SiCw interface and decreased to zero approximately 0.5 μm (∼1 whisker diameter) from the interface. Finite element techniques were used to predict the residual strains in the composite material and these results were compared to experimental measurements. |
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