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Optimization of a Hot Deformation Process of the 3003 Aluminum Alloy by Processing Maps
Guiqing Chen,Gaosheng Fu,Hongling Chen,Chaozeng Cheng,Wenduan Yan,Shaoyi Lin 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.5
Hot deformation behavior of the 3003 Al alloy was investigated by conducting hot compression tests at various temperatures (300-500 °C) and strain rates (0.0l-10.0 s−1). A constitutive equation was established to describe the flow behavior. The apparent activation energy of the 3003 Al alloy was determined to be 174.62 kJ·mol−1, which is higher than that for self-diffusion in pure Al (165 kJ·mol−1). Processing maps at a strain of 0.6 for hot working were developed on a dynamic materials model. The maps exhibit a flow instability domain at about 300-380 °C and 1.0-10.0 s−1. Dynamic recrystallization occurs extensively in the temperature range of 450-500 °C and at the strain rate of 10.0 s−1. The optimum parameters of hot working for the 3003 Al alloy are confined at 500 °C and 10.0 s−1with the highest efficiency (37%).
Guiqing Chen,Gaosheng Fu,Hongling Chen,Wenduan Yan,Chaozeng Cheng,Zechang Zou 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
3003 Al alloy samples with various metallurgical qualities were obtained by various melt-treatment methods and were deformed by isothermal compression in the deformation temperature range of 300 °C to 500°C at strain rates between 0.0l and 10.0 s −1with a Gleeble-1500 thermal simulator. The results show that there is a close relationship between melt-treatment and subsequent thermal deformation. The hot deformation acti-vation energy (Q) bears a linear relationship with the inclusion content (H) of 3003 Al alloy prepared by various melt-treatment methods, that is Q = 35.62 H + 171.58. The activation energy of the 3003 Al alloy prepared by the highly efficient melt-treatment is the lowest (174.62 kJ·mol −1), which is beneficial to the material hot plastic deformation. The critical strain of the 3003 Al alloy prepared by various melt-treatment methods is investigated through the work hardening rate. Finally, the critical conditions of the investigated alloy were determined to predict the occurrence of dynamic recrystallization.
Guiqing Chen,Gaosheng Fu,Tianyun Wei,Chaozeng Cheng,Huosheng Wang,Junde Wang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
The 3003 aluminum alloys with four Different initial grain sizes were deformed by isothermal compression in the range ofdeformation temperature 300–500 °C at strain rate 0.01–10.0 s −1 with Gleeble-1500 thermal simulator. The results showthat the smaller the initial grain size of the alloy, the greater the required deformation resistance, and the smaller the peakstrain, which is conducive to the occurrence of dynamic recrystallization (DRX). The DRX critical strain increases with thedecrease of the deformation temperature or the increase of the strain rate, and the DRX volume fraction increases with thedecrease of the strain rate and the increase of the deformation temperature. The average grain size of 3003 aluminum alloyafter deformation is smaller than that before deformation. The smaller the initial grain size, the lower the critical recrystallizationstrain. So the DRX is carried out more fully, contributing to the thermoplastic deformation of the alloy.