时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响  

Effects of Aging Treatment on Microstructure and Properties of Al-Zn-Mg-Cu Extruded Bar

作　　者：高靖靖 李旭健 付建建 周玉宝 马勇 黄青梅 杨献文 叶凌英[2] GAO Jingjing;LI Xujian;FU Jianjian;ZHOU Yubao;MA Yong;HUANG Qingmei;YANG Xianwen;YE Lingying(Henan Key Laboratory of Fastening Connection Technology,Xinyang 464000,Henan,China;School of Material Science and Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]河南省紧固连接技术重点实验室,河南信阳464000 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2024年第1期147-151,共5页Mining and Metallurgical Engineering

基　　金：河南省紧固连接技术重点实验室开放课题(JGLJ2208)。

摘　　要：研究了时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响。结果表明,合金经双级+再时效、回归再时效和非等温时效处理后,均获得了优于T73时效处理的抗晶间腐蚀性能,最大腐蚀深度由70μm分别降至19、48和30μm。合金经过双级+再时效处理后,获得了与回归再时效和非等温时效处理样品相近的抗拉强度和屈服强度,而抗晶间腐蚀性能明显优于回归再时效和非等温时效。合金经T73、双级+再时效、回归再时效和非等温时效处理后,晶界析出相平均尺寸分别为27.7、39.2、31.6和25.5 nm,基体沉淀相平均尺寸分别为8.1、10.2、10.9和11.0 nm。The effects of aging treatment on the microstructure and properties of Al-Zn-Mg-Cu extruded bars were investigated.The results show that the alloys treated by two-stage aging and re-aging(TSR),retroregression and re-aging(RRA),and non-isothermal aging(NIA),compared to the treatment with T73,all present better intergranular corrosion(IGC)resistance,with the maximum corrosion depth down from 70μm to 19,48,and 30μm,respectively.Compared to those treated by RRA and NIA,the TSR-treated alloy has the similar tensile strength and yield strength,but obviously superior IGC.After the treatment of T73,TSR,RRA,and NIA,the alloy has its grain boundary precipitates with average size of 27.7,39.2,31.6,and 25.5 nm,respectively,and matrix precipitates with average size of 8.1,10.2,10.9,and 11.0 nm,respectively.

关 键 词：AL-ZN-MG-CU 挤压棒材 时效工艺 双级+再时效 回归再时效 非等温时效 组织 力学性能 抗腐蚀性能 

分 类 号：TG156[金属学及工艺—热处理]