Residual stress relaxation and duty cycle on high cycle fatigue life of micro-arc oxidation coated AA7075-T6 alloy

被引：20
作者：
Dai, Weibing [1 ]
Hao, Jin [1 ]
Li, Changyou [1 ]
He, David [1 ]
Jia, Dawei [2 ]
Zhang, Yimin [3 ]
Tan, Zhi [4 ]
机构：
[1] Northeastern Univ, Sch Mech Engn & Automat, Shenyang, Liaoning, Peoples R China
[2] AVIC SAC Commercial Aircraft Co Ltd, Shenyang, Liaoning, Peoples R China
[3] Shenyang Univ Chem Technol, Sch Inst Equipment Reliabil, Shenyang, Liaoning, Peoples R China
[4] Shenyang Machine Tool Co Ltd, Shenyang, Liaoning, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 130卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Micro-arc oxidation; Duty cycle; Residual stress relaxation; Fatigue; PLASMA ELECTROLYTIC OXIDATION; CERAMIC COATINGS; ALUMINUM-ALLOY; GROWTH-BEHAVIOR; OXIDE COATINGS; PEO TREATMENT; CRACK GROWTH; MICROSTRUCTURE; FRACTURE; SURFACE;
D O I：
10.1016/j.ijfatigue.2019.105283
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Ceramic coatings were produced on AA7075-T6 alloy by micro-arc oxidation (MAO). The MAO treatment was performed at different duty cycles (8, 10, 15, and 20%). Effects of duty cycle on microstructure and fatigue behavior of the coated samples were investigated. Surface features and cross-section morphology, and fatigue fracture were observed by SEM and laser microscope. Phase structure and residual stress in the coatings were analyzed by X-ray diffraction. The nature and relaxation mechanism of the residual stress were revealed. Finally, the influence of the residual stress relaxation on the fatigue life at high and low cyclic stresses was explored.
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页数：11
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