基于微尺度数字图像相关法的预腐蚀对增材制造AlSi10Mg损伤失效影响  

Effect of pre-corrosion based on micro-scale digital image correlation on damage failure of additive manufacturing AlSi10Mg

作　　者：江圣 杜娟 宋海鹏[1] JIANG Sheng;DU Juan;SONG Haipeng(Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学中欧航空工程师学院,天津300300

出　　处：《航空材料学报》2024年第3期95-101,共7页Journal of Aeronautical Materials

基　　金：国家自然科学基金面上项目(11972364);天津市研究生科研创新项目(2021YJSS130)。

摘　　要：通过光学显微镜下的原位拉伸实验和微尺度数字图像相关方法(μ-DIC)观测预腐蚀增材制造AlSi10Mg的损伤演化和失效过程,并结合微观变形场演化、材料微观结构、三维腐蚀形貌和断口微观形貌等丰富的实验信息分析材料的微裂纹萌生和扩展行为。结果表明:腐蚀坑周围和亚表面缺陷(由增材制造工艺引起)的应力集中导致微裂纹萌生;存在多个微裂纹同时萌生现象,源于关键损伤区域的裂纹扩展和合并主导了试件的最终破坏;材料微观结构和腐蚀形态对微裂纹扩展也存在重要影响。The damage evolution and failure process of pre-corroded additive manufacturing AlSi10Mg through in-situ tensile experiments under an optical microscope and micro-scale digital image correlation(μ-DIC)were investigates.Combining the microscopic deformation field evolution,material microstructure,three-dimensional corrosion morphology and fracture microscopic morphology to analyze the initiation and propagation of micro-cracks in pre-corroded AlSi10Mg.The results show that the stress concentration around the corrosion pits and subsurface defects(caused by the additive manufacturing process)leads to the initiation of micro-cracks.There are multiple micro-cracks initiating at the same time,and the propagation and coalescence of micro-cracks originated from the key damage regions dominate the final failure of the specimen.Material micro-structure and corrosion morphology have an important influence on crack propagation.

关 键 词：增材制造铝合金 局部腐蚀 原位拉伸测试 数字图像相关法 损伤演化 

分 类 号：V252.2[一般工业技术—材料科学与工程] O34[航空宇航科学与技术—航空宇航制造工程]