The influence of strain rate and strain ageing on the flow stress of commercially-pure aluminium |
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| Affiliation: | 1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China;3. ArcelorMittal Global Research & Development, Structural Long products 66, rue de Luxembourg, L-4221 Esch-sur-Alzette, Luxembourg;4. Department of Civil and Environmental Engineering, National University of Singapore, E1A-02-18, 1 Engineering Drive 2, Singapore 117576, Singapore;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2. Industry and Equipment Technology Institute of HFUT, Hefei University of Technology, Hefei 230009, China;3. School of Materials Science and Engineering, Central South University, Changsha 410083, China;4. School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;5. National-Local Joint Engineering Research Center of Nonferrous Metals and Processing Technology, Hefei University of Technology, Hefei 230009, China |
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| Abstract: | Tensile tests on annealed, commercially-pure, aluminium specimens were performed in a hard machine at different temperatures for a number of constant strain rates. The results show that a range of strain, strain rate, and temperature exists for which the flow stress decreases with strain rate. This material property, when coupled with suitable mechanical conditions, is believed to be the cause of discontinuous repeated yielding. Various experiments, especially relaxation and reloading tests, show that the decrease of flow stress with strain rate can be directly attributed to rapid strain ageing due to impurity diffusion. Other experiments indicate the same effect for different loading histories. An analytical representation of the strain rate and strain ageing of the material is developed which predicts results in very good agreement with the experiments. |
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