非等温蠕变时效对Al-Zn-Mg-Cu合金力学性能和耐腐蚀性能的影响  

Effect of Nonisothermal Creep Aging on Mechanical Properties and Corrosion Resistance of Al-Zn-Mg-Cu Alloy

作　　者：王令姣 李小强[1,2] 潘存良 朱德智[1,2] 屈盛官[1,2] 黄遐 Wang Lingjiao;Li Xiaoqiang;Pan Cunliang;Zhu Dezhi;Qu Shengguan;Huang Xia(Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming,South China University of Technology,Guangzhou 510640,China;National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]华南理工大学、广东省金属新材料制备与成形重点实验室,广东广州510640 [2]华南理工大学、国家金属材料近净成形工程技术研究中心,广东广州510640 [3]中国航空制造技术研究院,北京100024

出　　处：《稀有金属材料与工程》2023年第3期867-875,共9页Rare Metal Materials and Engineering

基　　金：Core Technology Research Project of Foshan City(1920001000412);National Defense Basic Scientific Research Program(JCKY2018205B024)。

摘　　要：研究了非等温蠕变时效处理中升温速率和峰值温度对Al-Zn-Mg-Cu合金回弹性能、力学性能和耐腐蚀性能的影响。通过透射电镜分析了合金的析出行为和时效强化机理。结果表明:随着加热速率的降低和峰值温度的升高,合金的回弹率降低;晶内析出相的尺寸增大,而体积分数先增大后减小;晶界析出相逐渐变得不连续,无析出区扩大。经非等温蠕变时效(20℃/h,180℃)处理后的合金主要析出相为致密的η’相,晶界析出相不连续,无析出区的宽度约为44.2 nm。非等温蠕变时效(20℃/h,180℃)处理的合金力学性能和耐腐蚀性能均优于常见的等温蠕变时效(120℃,24 h)处理的合金,并且时效时间缩短了67%。The effects of the heating rate and peak temperature on the springback,mechanical properties,and corrosion resistance of Al-Zn-Mg-Cu alloy were investigated.The precipitation behavior and aging strengthening mechanism of the alloy were analyzed by transmission electron microscope.Results show that with decreasing the heating rate and increasing the peak temperature,the springback of the alloy is decreased;the size of intragranular precipitates is increased;the volume fraction of intragranular precipitates is firstly increased and then decreased;the grain boundary precipitates become discontinuous and the precipitate-free zone is expanded.After nonisothermal creep aging(NICA)treatment(20℃/h,180℃),the main precipitates of alloy are compactη'phase,the grain boundary precipitates are discontinuous,and the free zone width is approximately 44.2 nm.The mechanical properties and corrosion resistance of the alloy treated by NICA(20℃/h,180℃)are better than those of the alloy treated by common isothermal creep aging(120℃,24 h),and the aging time is shortened by 67%.

关 键 词：AL-ZN-MG-CU合金 非等温蠕变时效 析出相 力学性能 耐腐蚀性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]