微觀組織和力學性能的影響
(北京有色金屬研究總院 有色金屬材料制備加工國家重點實驗室，
北京 100088)
摘 要:
關鍵字: Al-Zn-Mg-Cu合金；噴射成形；雙級時效；微觀組織；力學性能
mechanical properties of spray-deposited
Al-10.8Zn-2.8Mg-1.9Cu alloy
ZHU Bao-hong, LIU Hong-wei, HE Xiao-qing
（State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract:Al-10.8Zn-2.8Mg-1.9Cu alloy was fabricated by spray atomization and deposition technique. The microstructure and mechanical properties of spray-deposited Al-10.8Zn-2.8Mg-1.9Cu alloy after two-step aging treatment at 110 ℃ and 150 ℃ were investigated using transmission electron microscopy (TEM), high-resolution electron microscopy (HREM) and tensile tests. The results indicate that the GP zones and h′ phase are major precipitates for the alloy under two-step aging condition. The discontinuous grain boundary precipitates are favorable to SCC resistance at over-aged condition, which reduces its ultimate tensile strength and yield strength by about 4.5% and 3.5% compared with those under peak-aged condition, respectively.
Key words: Al-Zn-Mg-Cu alloy; spray deposition; two-step aging treatment; microstructure; mechanical properties
