5059高镁铝合金热变形过程中的组织演变规律研究  

Study on Microstructure Evolution of 5059 High Magnesium Aluminum Alloy during Hot Deformation

作　　者：王经涛 孙宁 余浪 李星辉 郭丰佳 张佼[2] 韩延峰[2] 曾凡清 杜敏 王成见 WANG Jingtao;SUN Ning;YU Lang;LI Xinghui;GUO Fengjia;ZHANG Jiao;HAN Yanfeng;ZENG Fanqing;DU Min;WANG Chengjian(National Engineering Research Center for Plastic Working of Aluminium Alloys,Shandong Nanshan Aluminium Co.,Ltd.,Longkou 265713,China;School of Materials Science and Engineering,Shanghai JiaoTong University,Shanghai 200240,China;Yantai Nanshan University,Longkou 265713,China)

机构地区：[1]山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心,山东龙口265713 [2]上海交通大学材料科学与工程学院,上海200240 [3]烟台南山学院,山东龙口265713

出　　处：《热加工工艺》2024年第23期91-97,共7页Hot Working Technology

基　　金：国家重点研发计划项目(2020YFB0311200)。

摘　　要：采用Gleeble-3500热模拟试验机对高镁5059铝合金进行等温热压缩试验,通过金相显微镜、扫描电子显微镜、透射电子显微镜以及X射线衍射仪等对不同热压缩条件下5059铝合金的组织进行表征,研究了合金热变形过程中的晶粒形态、第二相含量、位错分布、织构类型以及动态再结晶演变等规律。结果表明,热压变形后,5059铝合金低温变形下呈连续网格状分布的粗大相随热压缩变形温度的升高而变得断续分布,且晶粒尺寸逐渐变大,大晶粒之间的细小亚晶粒数量逐渐减少,部分笔直的晶界发生弯曲并向锯齿状转变,晶粒由小角度晶界向大角度晶界转变;同时组织内位错缠结程度减轻,位错密度下降,组织再结晶程度不断变大。5059铝合金在热压缩变形过程中主要存在Goss织构、R织构、P织构及Brass织构、S织构,随着变形温度的升高,组织中的织构由形变织构向再结晶织构转变。Gleeble-3500 thermal simulation testing machine was used to conduct isothermal compression tests for high magnesium 5059 aluminum alloy.The microstructure of the alloy under different hot compression conditions was characterized using techniques such as metallographic microscopy,scanning electron microscopy,transmission electron microscopy and X-ray diffraction.The laws of grain morphology,second phase content,dislocation distribution,texture types and dynamic recrystallization evolution during the alloy hot deformation process were studied.The results show that after hot compression deformation of 5059 aluminum alloy,the coarse phase with a continuous grid distribution at low deformation temperatures becomes intermittent with the increase of hot compression deformation temperature,and the grain size gradually increases,the number of small subgrains between large grains gradually decreases,and some straight grain boundaries bend and transform into serration.The grains transform from small angle grain boundaries to large angle grain boundaries.At the same time,the degree of dislocation entanglement within the microstructure decreases,the dislocation density decreases,and the degree of recrystallization in the organization continues to increase.During the hot compression deformation process of 5059 aluminum alloy,there are mainly Goss texture,R texture,P texture,Brass texture and S texture.As the deformation temperature increases,the texture in the structure changes from deformation texture to recrystallization texture.

关 键 词：5059铝合金 热压缩 组织演变 动态再结晶 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG301[金属学及工艺—金属材料]