双级时效处理对喷射沉积Al-Zn-Mg-Cu合金微观组织和力学性能的影响|王锋,熊柏青,张永安,朱宝宏,刘红伟,何小青-《中国有色金属学报》官方网站|全网首发|论文开放获取

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第17卷第7期总第100期 2007年7月

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文章编号：1004-0609(2007)07-1058-05

双级时效处理对喷射沉积Al-Zn-Mg-Cu合金
微观组织和力学性能的影响

王锋，熊柏青，张永安，朱宝宏，刘红伟，何小青

(北京有色金属研究总院有色金属材料制备加工国家重点实验室，
北京 100088)

摘要:

利用喷射成形技术制备Al-10.8Zn-2.8Mg-1.9Cu合金。借助透射电镜、高分辨电子显微镜和拉伸性能测试等手段研究双级时效处理对喷射沉积Al-Zn-Mg-Cu合金微观组织和力学性能的影响。结果表明，合金经120 ℃, 16 h+150 ℃, 2 h双级时效后，晶内析出相略有长大，此时合金的强化机制是GP区和h′相的综合强化。与峰时效条件相比，双级时效后合金的抗拉强度和屈服强度分别降低4.5%和3.5%，但合金组织中的晶界析出相完全断开，这对提高合金的抗应力腐蚀能力具有重要意义。

关键字: Al-Zn-Mg-Cu合金；喷射成形；双级时效；微观组织；力学性能

Effect of two-step aging treatment on microstructure and
mechanical properties of spray-deposited
Al-10.8Zn-2.8Mg-1.9Cu alloy

WANG Feng, XIONG Bai-qing, ZHANG Yong-an,
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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW