Grain boundary precipitation induced by grain crystallographic misorientations in an extruded Al-Mg-Si-Cu alloy

作者：Yang Wenchao^*; Ji Shouxun; Li Zhou; Wang Mingpu

来源：Journal of Alloys and Compounds, 2015, 624: 27-30.

DOI：10.1016/j.jallcom.2014.10.206

• Aluminium alloys
• Grain boundary
• Transmission electron microscope
• EBSD

The grain boundary precipitation induced by grain crystallographic misorientations in an extruded Al-Mg-Si-Cu alloy was investigated by electron back-scattering patterns and high resolution transmission electron microscopy. The results showed that compared with the recrystallization cube {100}[001] texture, the deformation brass {110}[112] texture prevailed in the microstructure. The brass texture mainly contributed for the formation of low angle grain boundaries, where the pre-beta ''/beta' phases were formed during precipitation. The recrystallization cube texture predominately induced the formation of high angle grain boundaries, where the Q'/Q phases related to the corrosion were precipitated. And, high and low grain boundary was 23.5% and 76.5% proportion in the microstructure, respectively. Finally, it was believed that in order to improve the resistance to intergranular corrosion of alloy, the recrystallization cube {100}[001] texture should be inhibited as far as possible.

• 单位
  中南大学