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.
作者
刘宗杰
李煦
李丽
逄锦程
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)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2019年第5期89-91,共3页
Aerospace Materials & Technology
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
Bottom cover plate
1420 Aluminum-lithium alloy
Phosphoric acid anodizing
Bright crystal defect
Casting process