Microstructure Evolution and Constitutive Modeling Based on Flow Behavior of 2297 Al-Cu-Li Alloy
| Autor: | Jian Shen, Bai Ping Mao, Xiao Dong Yan, Sheng Li Yang, Xi Wu Li |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Materials science 020502 materials Mechanical Engineering Constitutive equation Metallurgy 02 engineering and technology Work hardening Flow stress Strain rate Condensed Matter Physics Microstructure Stress (mechanics) 020901 industrial engineering & automation 0205 materials engineering Mechanics of Materials General Materials Science Deformation (engineering) Composite material Softening |
| Zdroj: | Materials Science Forum. 850:208-218 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.850.208 |
| Popis: | Flow behavior and microstructure evolution of 2297 Al-Cu-Li alloy were investigated by isothermal compression tests conducted at the deformation temperature of 300-500°C and strain rates of 0.001-10s-1. The results demonstrate that the characteristics of stress-strain curves depended on the interaction of work hardening and dynamic softening. The true stress increased with the decreasing of temperature and the increasing of the strain rate. At a given deformation condition, the flow curve consisted of three stages: stage I (work hardening stage), stage II (softening stage) and stage III (steady stage). Deformation temperature and strain rate had a great influence on microstructure evolution. 2297 alloy deformed at low temperature (300°C) and high strain rate (10s-1) showed a DRV characteristic. As deformed at high temperature (500°C) and low strain rate (0.001s-1), DRX gradually become the main softening mechanism. The measured flow stress was friction corrected and then employed to develop constitutive equations on the basis of the Arrhenius-type equation by considering the effect of the strain on material constants by a sixth orders polynomials. Flow stress value of 2297 alloy predicted by the proposed constitutive equations shows a good agreement with experimental results, thereby confirming the validity of the developed constitutive relation. |
| Databáze: | OpenAIRE |
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