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

被引：1

作者：

Liwei Zhong ^{[1
]}

Wenli Gao ^{[1
]}

Zhaohui Feng ^{[2
,3
]}

Zheng Lu ^{[2
,3
]}

Congcong Zhu ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Hunan University

[2] Institute of Aluminum Alloy, Beijing Institute of Aeronautical Materials

[3] Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing Institute of Aeronautical Materials

来源：

JournalofMaterialsScience&Technology | 2019年 / 35卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Al-Cu-Li alloy; Hot deformation; Processing map; Dynamic recrystallization; Precipitate;

D O I：

暂无

中图分类号：

TG146.21 []; TG115.5 [机械性能（力学性能）试验];

学科分类号：

080502 ;

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;. 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;and 420–480℃/0.1-1 s;. 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 T;（Al;Cu Li） particles precipitated in the homogenized specimen. After deformation at 500℃, most of the primary T;particles dissolved back into the matrix, and secondary fine T;particles precipitated at deformation-induced dislocations, high angle grain boundaries and other dispersed particles.

引用

页码：2409 / 2421

页数：13