分级淬火对Al-Mg-Si-Cu合金力学及腐蚀性能的影响  

Effect of Step Quenching on Mechanical and Corrosion Properties of Al-Mg-Si-Cu Alloy

作　　者：王昆 陈志国 Tarek Khelfa 周燕锴 WANG Kun;CHEN Zhiguo;Tarek Khelfa;ZHOU Yankai(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;School of Intelligent Manufacturing,Hunan Open University,Changsha 410004,Hunan,China;School of Energy and Electromechanical Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,Hunan,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]湖南开放大学智能制造学院,湖南长沙410004 [3]湖南人文科技学院能源与机电工程学院,湖南娄底417000

出　　处：《矿冶工程》2024年第6期134-138,143,共6页Mining and Metallurgical Engineering

基　　金：湖南省科技创新计划项目(2022WZ1014);湖南省“双一流”学科建设项目(湘教通2018-469号)。

摘　　要：采用室温拉伸、晶间腐蚀、电化学腐蚀和TEM等测试方法,研究了不同温度下分级淬火对Al-Mg-Si-Cu合金力学和耐腐蚀性能的影响。结果表明,100℃/60 min分级淬火后的合金在28 d自然时效后不仅能维持162.49 MPa的低屈服强度和105.60 MPa的高强化增量,相较于水淬合金,晶间腐蚀深度降低了57.2%。TEM和EDS分析结果表明,分级淬火期间形成的Ⅱ型Mg-Si团簇抑制了自然时效期间形成的Ⅰ型团簇,有效促进了晶内β″相、β′相的析出。此外,晶界处的析出相由于附近溶质原子的耗尽呈现粗大球形、离散分布的特征。Effect of step quenching at different temperatures on mechanical and corrosion properties of Al-Mg-Si-Cu alloy was explored by carrying out room temperature tensile test,intergranular corrosion test,electrochemical corrosion test,as well as by means of transmission electron microscopy(TEM).It is found that the alloy,after 60 minutes of step quenching at 100 ℃ followed by 28 days of natural aging,can not only maintain a low yield strength of 162.49 MPa and a high strengthening increment of 105.60 MPa,but also exhibit a 57.2% reduction in intergranular corrosion depth compared to water-quenched alloy.TEM and EDS analyses show that type II Mg-Si clusters formed during step quenching effectively inhibit type I clusters formed during natural aging,while promote precipitation of intergranular β″ phase and β′ phase.Moreover,the precipitated phase at grain boundary is coarse and spherical with discrete distribution due to depletion of nearby solute atoms.

关 键 词：分级淬火 AL-MG-SI-CU合金 力学性能 腐蚀性能 屈服强度 极限抗拉强度 析出相 

分 类 号：TG156[金属学及工艺—热处理]