2A97铝锂合金的化学铣切工艺研究
Study on Chemical Milling Process of 2A97 Al-Li Alloy
于娟 1冯朝辉 1李惠曲 1陈高红1
作者信息
- 1. 北京航空材料研究院 北京市先进铝合金材料及应用工程技术研究中心, 北京 100095
- 折叠
摘要
通过高频疲劳试验、金相显微镜(OM)、扫描电镜(SEM)等方法对经过 3 种不同化铣槽液处理的 2A97 铝锂合金薄板表面粗糙度、疲劳性能和合金的微观组织缺陷进行了研究.结果表明:与未添加硫化钠或三乙醇胺的槽液相比,同时添加硫化钠和三乙醇胺的化铣槽液化学铣切性能更佳,化铣后的材料表面平整,微观缺陷数量较少,尺寸较小,表面粗糙度达到Ra≤1.6 μm,疲劳寿命可达到3.71×105 N.硫化钠和三乙醇胺的加入能有效缓解合金的局部腐蚀,使铝合金表面与化铣槽液腐蚀更加均匀,形成的微观缺陷数量更少,尺寸更小,因此,能获得更好的表面粗糙度结果和更优的疲劳性能.
Abstract
The surface roughness,fatigue property and microscopic defects evolution of 2A97 aluminum-lithium alloy sheet,which was milled by three different milling fluids,were studied by high frequency fatigue testing,optical microscopy and scanning electron microscope.The results show that compared with the milling fluid without sodium sulfide or triethanolamine,the milling fluid with sodium sulfide and triethanolamine simultaneously can get better milling performance.The surface of the material after chemical milling is smooth with less and smaller microscopic defect.The surface roughness is Ra≤1.6 μm,and the fatigue life is up to 3.71×105 N;the addition of sodium sulfide and triethanolamine can effectively alleviate the local corrosion of the alloy.The surface of aluminum alloy can be more evenly corroded,and the microscopic defects can be less and smaller,so it can achieve better surface roughness and fatigue property.
关键词
2A97铝锂合金/化学铣切/表面粗糙度/疲劳性能/微观缺陷Key words
2A97 Al-Li alloy/chemical milling/surface roughness/fatigue property/microscopic defects引用本文复制引用
出版年
2024
NETL
NSTL
万方数据