ZL205A合金热处理参数优化及其组织性能演变  

Optimization of Heat Treatment Parameters and Evolution of Microstructure and Properties of ZL205A Alloy

作　　者：郭廷彪[1,2] 钱丹晨 王炳 王楠 丁万武[1,2] 金玉花[1,2] GUO Tingbiao;QIAN Danchen;WANG Bing;WANG Nan;DING Wanwu;JIN Yuhua(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学有色金属深加工与回收国家重点实验室,甘肃兰州730050 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《材料科学与工程学报》2025年第1期23-30,共8页Journal of Materials Science and Engineering

基　　金：甘肃省省科技重点研发计划项目(20YF8GA056);甘肃省重大科技专项项目(1302GKDA015)。

摘　　要：ZL205A合金是航空航天领域重要的铸造铝合金,热处理制度是提升ZL205A合金综合力学性能的关键。本研究通过530℃×2 h+540℃×13 h固溶+165℃×6 h时效,研究了固溶及时效参数对ZL205A合金组织和力学性能的影响。采用激光共聚焦显微镜(CLSM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、场发射透射电子显微镜(FTEM)等表征技术检测了不同热处理制度下材料的微观组织并测试其力学性能;分析了材料组织机制与力学性能的关联效应。研究结果表明,530℃×2 h+540℃×13 h为较好的双级固溶制度。固溶处理后,铸态合金中的网状共晶组织溶解,合金的组织均匀性提高且微观组织得到改善。低温时效过程中θ′纳米级析出相在晶界上不连续分布,温度升高会促使θ′相发生粗化且数量增加;稳定的θ′相可有效阻碍位错运动,提升合金的力学性能。ZL205A alloy is an important cast aluminum alloy in aerospace field.Heat treatment is the key to improve the comprehensive mechanical properties of ZL205A alloy.The effects of solid solution and aging parameters on the microstructure and mechanical properties of ZL205A alloy were studied by 530℃×2 h+540℃×13 h solid solution+165℃×6 h again.Laser confocal microscope(CLSM),X-ray diffraction(XRD),scanning electron microscope(SEM)and field emission transmission electron microscope(Field emission transmission electron microscope,TEM)were used to detect the microstructure and mechanical properties of the materials under different heat treatment systems,and the correlation effect between microstructure mechanism and mechanical properties was analyzed.The results show that 530℃×2 h+540℃×13 h is a better two-stage solid solution system.After solution treatment,the reticulated eutectic structure in the as-cast alloy dissolves,the microstructure uniformity of the alloy is improved,and the microstructure of the alloy is improved.During low temperature aging,θ'nanometer precipitates are discontinuously distributed on the grain boundary,and the increase of temperature will lead to the coarsening and increase ofθ'phase,and the stableθ'phase can effectively hinder the dislocation movement and improve the mechanical properties of the alloy.

关 键 词：ZL205A合金 微观组织 力学性能 固溶 纳米析出相 

分 类 号：TG166.3[金属学及工艺—热处理]