Superplastic Tensile Deformation Behavior and Microstructural Evolution of Al–Zn–Mg–Cu Alloy

Metals

Hongliang Hou¹  Ning Zhang¹  Guangyu Li²  Jian Wang²  Hua Ding² 

[1] Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China;School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;

关键词: Al–Zn–Mg–Cu alloy;    microstructure evolution;    superplastic;   

DOI  :  10.3390/met9090941

来源: DOAJ

【 摘 要 】

The microstructural evolution of the Al−Zn−Mg−Cu alloy during the superplastic deformation process has been studied by high temperature tensile experiment. The superplastic deformation behaviors are investigated under different temperatures of 470 °C, 485 °C, 500 °C, 515 °C and 530 °C, and different strain rates of 3 × 10⁻⁴ s⁻¹, 1 × 10⁻³ s⁻¹, 3 × 10⁻² s⁻¹ and 1 × 10⁻² s⁻¹. The microstructure observation shows that uniform and equiaxed grains can be obtained by dynamic recrystallization in the initial stage of superplastic deformation. Once the recrystallization process has been finished, the variations of the fraction of high angle boundary, the grain aspect ratio and the Schmid factor are negligible during the superplastic deformation, which shows that the grain boundary sliding and grain rotation are the main deformation mechanisms. The maximum texture intensity decreases compared with the initial microstructure, indicating that grain boundary sliding and grain rotation can weaken the texture, however, the texture intensity increases in the final stage of superplastic deformation, which may be resulted from the stress concentration.

【 授权许可】

Unknown