Hot deformation characterization of as-homogenized Al-Cu-Li X2A66 alloy through processing maps and microstructural evolution
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第10期
论文作者：Liwei Zhong Wenli Gao Zhaohui Feng Zheng Lu Congcong Zhu
文章页码：2409 - 2421
摘 要：Uniaxial compression tests were carried out on an Al-Cu-Li alloy at a temperature range of 300–500℃ and a strain rate range of 0.001–10 s-1. Four representative instability maps based on Gegel, AlexanderMalas（A-M）, Kumar-Prasad（K-P） and Murty-Rao（M-R） criteria were constructed. Through formula deduction and microstructural observation, it can be concluded that M-R criterion is more accurate than K-P criterion, and the first two criteria are better than Gegel and A-M criteria. From a power dissipation map and a M-R instability map, the optimized processing parameters are 480–500℃/0.001–0.1 s-1 and 420–480℃/0.1-1 s-1. The corresponding microstructural analysis shows that dynamic recovery and partial dynamic recrystallization are main dynamic softening mechanisms. Transmission electron microscopy observation indicated that a large number of primary coarse T1（Al2 Cu Li） particles precipitated in the homogenized specimen. After deformation at 500℃, most of the primary T1 particles dissolved back into the matrix, and secondary fine T1 particles precipitated at deformation-induced dislocations, high angle grain boundaries and other dispersed particles.
Liwei Zhong1，Wenli Gao1，Zhaohui Feng2,3，Zheng Lu2,3，Congcong Zhu1
1. College of Materials Science and Engineering, Hunan University2. Institute of Aluminum Alloy, Beijing Institute of Aeronautical Materials3. Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing Institute of Aeronautical Materials
摘 要：Uniaxial compression tests were carried out on an Al-Cu-Li alloy at a temperature range of 300–500℃ and a strain rate range of 0.001–10 s-1. Four representative instability maps based on Gegel, AlexanderMalas（A-M）, Kumar-Prasad（K-P） and Murty-Rao（M-R） criteria were constructed. Through formula deduction and microstructural observation, it can be concluded that M-R criterion is more accurate than K-P criterion, and the first two criteria are better than Gegel and A-M criteria. From a power dissipation map and a M-R instability map, the optimized processing parameters are 480–500℃/0.001–0.1 s-1 and 420–480℃/0.1-1 s-1. The corresponding microstructural analysis shows that dynamic recovery and partial dynamic recrystallization are main dynamic softening mechanisms. Transmission electron microscopy observation indicated that a large number of primary coarse T1（Al2 Cu Li） particles precipitated in the homogenized specimen. After deformation at 500℃, most of the primary T1 particles dissolved back into the matrix, and secondary fine T1 particles precipitated at deformation-induced dislocations, high angle grain boundaries and other dispersed particles.
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