Effect of Thermal Exposure Temperature on Grain Boundary Evolution of 7A85 Aluminum Alloy

Author of the article:TU Tao ，TIAN Jun , LI Jizhen , WU Borui ，DAI Pan ，XU Chunjie

Author's Workplace：1. Meigaomei Nobel Prize (Tongchuan) New Materials Co., Ltd., Tongchuan 727031, China; 2. Xi'an Shechtman Nobel Prize New Materials Institute, Xi'an 710048, China; 3. Xi'an North Qinghua Mechanical and Electrical Co., Ltd., Xi'an 710025, China; 4. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China; 5. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

Key Words： thermal exposure; 7A85 aluminum alloy; grain boundary

Abstract：The evolution characteristics of grain boundary of two-step artificial overaged 7A85 aluminum alloy under
thermal exposure at different temperatures were investigated. The results show that with the increase of temperature, the
size of nano-sized precipitated η-phase at grain boundary increases, the width of precipitated zone at grain boundary
increases gradually, and the distribution of precipitated phase at grain boundary changes from continuous network
distribution to discontinuous network, so the corrosion resistance of the alloy has been improved.