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OA北大核心CSTPCD

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.