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Hot deformation characterization of as-homogenized Al-Cu-Li X2A66 alloy through processing maps and microstructural evolution

查看全文 作　　者：Liwei [1]Zhong;Wenli [1]Gao;Zhaohui [2,3]Feng;Zheng [2,3]Lu;Congcong [1]Zhu 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Hunan University,Changsha 410082,China;[2]Institute of Aluminum Alloy,Beijing Institute of Aeronautical Materials,Beijing 100095,China;[3]Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications,Beijing Institute of Aeronautical Materials,Beijing 100095,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第10期,共13页高影响力期刊 基　　金：supported financially by the National Natural Science Foundation of China (Nos. 51374187, 51474195 and 51474101) 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. 关 键 词：DEFORMATION ALLOY RECRYSTALLIZATION
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