Effect of cold expansion on fatigue life of anodized Al alloy

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Li, Nan^1^2^3^4 ; Li, Haitao^5 ; Liu, Hongtao^5 ; Liu, Changkui^1^2^3^4

AECC Beijing Institute of Aeronautical Materials, Beijing

100095, China^1

Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing

100095, China^2

Aviation Key Laboratory of Science and Technology On Materials Testing and Evaluation, Beijing

100095, China^3

Key Laboratory of Aeronautical Materials Testing and Evaluation, Aero Engine Corporation of China, Beijing

100095, China^4

Structure Department, Shenyang Aircraft Design Research Institute, Shenyang

110035, China^5

关键词: Al-alloy;    Anodizing treatment;    Cold expansion;    Fracture surfaces;    Hole edge;    Open holes;    Strengthening mechanisms;    Surface integrity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/2/022076/pdf
DOI  :  10.1088/1757-899X/490/2/022076

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Anodizing treatment can improve corrosion resistance of aluminum alloy but decrease the fatigue life significantly. Introducing cold expansion before anodizing can increase the fatigue life of the specimen with open-hole structure by 2582% than the anodized one. Scanning electron microscopy (SEM) was employed for microstructure and fracture surface observation. Residual stress distribution near the sample hole edge was measured to elucidate the strengthening mechanism. The results revealed that although anodizing treatment decreases the surface integrity, the cold expansion is an effective method to improve the open-hole structure specimen remarkably.