Journal Article

Activation mechanisms of slip systems during hot single point incremental forming of AA2024 sheet

An, Zhiguo, Li, Zhibing, Ren, Zhong, Gao, Zhengyuan, Qiao, Zhengyang, Jia, Youdong, Lin, Han, Zhang, Yuhang, Sun, Pengfei, Li, Zhengfang

2024

Overview

The hot single point incremental forming is usually adopted to fabricate the complex part of AA2024 aluminum alloy. However, the activation mechanism of the slip system still has not been discovered at elevated temperatures. In response, the article has proposed a novel macro–micro analysis method to reveal the activation mechanism of the slip system. The shear stress model, which is demonstrated through the Schmid factor distribution of each crystal plane group, of crystal planes is established to calculate the shear stress of each slip direction. The effect of the forming process parameters on the forming limit angle is analyzed in detail, and the forming temperature is a primary factor for the increase of the forming limit angle. On this basis, the dislocation density of the material is investigated at different temperatures, and the dislocation density of the material is significantly decreased at 180 °C, which can weaken the dislocation pile-up due to the increase of the stacking fault energy. Finally, the slip system number of each crystal plane group is further analyzed at different temperatures, and the novel slip systems of the three crystal plane groups, such as {111}, {100}, and {110}, are both significantly activated at 180 °C.

• Publisher: Springer Nature B.V
• Subject: Activation analysis / Aluminum base alloys / Crystal dislocations / Dislocation density / Forming limits / Forming techniques / High temperature / Process parameters / Shear stress / Slip / Stacking fault energy