Superplastic deformation of a heat-resistant Al–Cu–Mg–Ag–Mn alloy |
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| Authors: | Xiao Daihong Wang Jiannong Chen Kanghua Huang Baiyun |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, PR China;1. Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai, 200237, PR China;2. School of Mechanical Engineering, Qingdao University of Technology, Qingdao, Shandong, 266520, China;1. Department of Mechanical Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;2. Kobe Steel Ltd., Aluminum & Copper Business (Chofu Works), 14-1 Chofu Minato-machi, Shimonoseki, Yamaguchi 752-0953, Japan;1. Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada;2. PCP Canada, Saguenay, QC G7B 3N8, Canada;1. School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, China;2. Key Model Department, Air Force Equipment Department, Beijing 100081, China;3. Beijing Spacecrafts, Beijing 100094, China;1. Bundesanstalt für Materialforschung und –prüfung (BAM), Experimental and Model Based Mechanical Behavior of Materials, Unter den Eichen 87, 12205 Berlin, Germany;2. Fraunhofer Institut für Werkstoffmechanik IWM, 79108 Freiburg, Germany;1. Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul 151-744, Republic of Korea;2. Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;3. Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA |
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| Abstract: | The superplastic behavior and deformation mechanism of a heat-resistant Al–Cu–Mg–Ag–Mn alloy prepared by ingot metallurgy was investigated by using optical microscopy, scanning electron microscopy and transmission electron microscopy. It is shown that the Al–Cu–Mg–Ag–Mn alloy shows good superplastic properties at temperatures higher than 450 °C and strain rates lower than 10?2 s?1. A maximum elongation-to-failure of 320% was observed at 500 °C and 5 × 10?4 s?1, where the corresponding strain rate sensitivity index m is 0.58 and the flow stress σ is 5.7 MPa. Microstructure studies revealed that the observed superplastic behavior resulted from severe grain elongation rather than grain boundary sliding. It is suggested that this phenomenon may provide a new concept for developing superplastic materials. |
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