Mn对铸态及均匀化态6082铝合金组织的影响  

Influence of Mn on microstructure of as-cast and homogenized 6082 aluminum alloy

作　　者：崔振杰 姜海昌[2] 张舵 张汝梦 牌君君 贾娈娈 CUI Zhen-jie;JIANG Hai-chang;ZHANG Duo;ZHANG Ru-meng;PAI Jun-jun;JIA Luan-luan(Binzhou Institute of Technology,Shandong Key Laboratory of Advanced Aluminium Materials and Technology,Binzhou 256600,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China)

机构地区：[1]滨州魏桥国科高等技术研究院,山东省先进铝基材料与技术重点实验室,山东滨州256600 [2]中国科学院金属研究所中国科学院核用材料与安全评价重点实验室,辽宁沈阳110016

出　　处：《材料热处理学报》2024年第6期33-41,共9页Transactions of Materials and Heat Treatment

基　　金：企业自研项目(GYY-JSCL-2023-ZY-002);魏桥国科高研院-中科院金属所研发项目(GYY-JSBU-2022-001)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、差示扫描量热法(DSC)和电导率测试仪等研究了Mn含量分别为0.7 mass%和0.5 mass%(分别命名为07Mn合金和05Mn合金)的6082铝合金铸态、均匀化态组织及析出行为。结果表明:铸态07Mn合金组织中形成了更粗大的鱼骨状结晶相,均匀化退火后,晶界处难溶结晶相转化为了微米级α-Al(Mn, Fe)Si相,并在晶内析出了纳米级的α-Al(Mn, Fe)Si相。07Mn合金中α-Al(Mn, Fe)Si相的析出激活能更低,从而析出了数量更多、尺寸更小的α-Al(Mn, Fe)Si相。通过电导率计算,确认了Mn元素会促进合金中α-Al(Mn, Fe)Si相的形核。Microstructure and precipitation behavior of as-cast and homogenized 6082 aluminum alloy with Mn content of 0.7 mass%and 0.5 mass%(named 07Mn alloy and 05Mn alloy,respectively)were studied by means of optical microscope(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),differential scanning calorimetry(DSC)and conductivity tester.The results show that coarser fishbone-like crystalline phases are formed in the microstructure of the as-cast 07Mn alloy.After homogenization annealing,the insoluble crystalline phases at the grain boundaries are transformed into micrometer sizedα-Al(Mn,Fe)Si phase,and nanoscaleα-Al(Mn,Fe)Si phase is precipitated in the grain.The precipitation activation energy ofα-Al(Mn,Fe)Si phase in the 07Mn alloy is lower,resulting in the precipitation of more and smallerα-Al(Mn,Fe)Si phase.Through conductivity calculation,it is confirmed that Mn element promotes the nucleation ofα-Al(Mn,Fe)Si phase in the alloy.

关 键 词：6082铝合金 MN含量 结晶相 弥散相 α-Al(Mn Fe)Si 

分 类 号：TG146.2[一般工业技术—材料科学与工程]