1420铝锂合金底遮板表面亮斑分析  

Analysis of The Bright Spot on The Surface of 1420 Al-Li Alloy Bottom Cover Plate

作　　者：刘宗杰[1] 李煦[1] 李丽[1] 逄锦程[2] 王志河 LIU Zongjie;LI Xu;LI Li;PANG Jincheng;WANG Zhihe(China Academy of Launch Vehicle Technology,Beijing 100076;Aerospace Research Institute of Materials & Processing Technology,Beijing 100076)

机构地区：[1]中国运载火箭技术研究院,北京100076 [2]航天材料及工艺研究所,北京100076

出　　处：《宇航材料工艺》2019年第5期89-91,共3页Aerospace Materials & Technology

摘　　要：为研究航天用1420铝锂合金底遮板表面产生异常亮斑的形成原因,对异常痕迹进行了组织分析、形貌观察、断口能谱分析、显微硬度测试、化学成分检测。结果表明:底遮板表面的异常痕迹贯穿壁厚,该区域组织成分异常,为光亮晶缺陷。结合底遮板所用原材料生产工艺分析,发现此光亮晶是1420铝锂合金铸锭在熔铸过程中形成的,属冶金类缺陷,在磷酸阳极化过程中,由于缺陷处膜层质量较差形成了宏观显现的亮斑。In order to study the formation cause of abnormal bright spots on the surface of 1420 Al-Li alloy bottom cover plate for aerospace applications,the abnormal traces were analyzed by means of microstructure analysis,fracture morphology observation,energy dispersion spectrum analysis,micro-hardness test and chemical composition analysis.The results show that the abnormal traces on the surface of the bottom cover plate are bright crystalline defects which penetrate through the whole plate.The microstructure and composition of the traces are abnormal.Considering the production process of the bottom cover plate,the bright crystalline defects are formed during the melting of 1420 aluminum-lithium alloy ingots,which are metallurgical defects.Due to the poor quality of the film layer in the defect section,the bright spots are formed during the process of phosphoric acid anodizing.

关 键 词：底遮板 1420铝锂合金 磷酸阳极化 光亮晶缺陷 铸造过程 

分 类 号：TG14[一般工业技术—材料科学与工程] TG2[金属学及工艺—金属材料]