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
崔振杰 1姜海昌 2张舵 2张汝梦 1牌君君 1贾娈娈1
作者信息
- 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
- 折叠
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.
Abstract
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 sized α-Al(Mn,Fe)Si phase,and nanoscale α-Al(Mn,Fe)Si phase is precipitated in the grain.The precipitation activation energy of α-Al(Mn,Fe)Si phase in the 07Mn alloy is lower,resulting in the precipitation of more and smaller α-Al(Mn,Fe)Si phase.Through conductivity calculation,it is confirmed that Mn element promotes the nucleation of α-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)SiKey words
6082 aluminum alloy/Mn content/crystalline phase/dispersed phase/α-Al(Mn,Fe)Si引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据