Grain refinement and superplasticity of pipes processed by high-pressure sliding |
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| Authors: | Yongpeng Tang Koki Matsuda Yoichi Takizawa Manabu Yumoto Yoshiharu Otagiri Zenji Horita |
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| Affiliation: | 1. Department of Materials Science and Engineering, Kyushu University, Fukuoka, Japan;2. WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, Japantayopeng@gmail.com;4. Technology Department, Nagano Forging Co., Ltd, Nagano, Japan;5. WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, Japan;6. Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu, Japan;7. Magnesium Research Center, Kumamoto University, Kumamoto, Japan;8. Synchrotron Light Application Center, Saga University, Saga, Japan |
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| Abstract: | ABSTRACTThe high-pressure sliding (HPS) process was applied for grain refinement of a pipe form of an Al-3wt%Mg-0.2wt%Sc alloy by developing two types of straining techniques (called in this study anvil sliding and mandrel sliding). To achieve a homogeneous microstructure throughout the cross-section of the pipe, the sample is rotated around the longitudinal axis every after sliding operation by introducing multi-pass technique, named multi-pass HPS (MP-HPS) as developed earlier for rods. The MP-HPS-processed sample shows ultrafine-grained structures with an average grain size of ～260 and ～300?nm after the HPS processing using anvil sliding and mandrel sliding. The samples also exhibit superplasticity with total elongations well more than 400%, respectively. A finite-element method is used to simulate the evolution of strain in the HPS processing and demonstrates that the simulation well represents the experimental results. |
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| Keywords: | Multi-pass high-pressure sliding pipe grain refinement superplasticity Al alloy |
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