Transactions of Materials and Heat Treatment

Title：Research on corrosion fatigue performances of 5083P-O aluminium alloy sheet

Authors： Ma Liyong Shi Shuzheng Sun Xiaohong Jia Yajing Liu Yong Song Mingxing

Unit： Hebei University of Architecture Beihang University CRRC Qingdao Sifang Co. Ltd. Zhangjiakou Cigarette Factory Co. Ltd. Anhui Exxon Medical Robot Co. Ltd.

KeyWords： 5083P-O aluminum alloy corrosion fatigue S-N curve corrosion pit microstructure

ClassificationCode：TG115.57

year,vol(issue):pagenumber：2019,44(9):141-145

Abstract：

For 5083P-O aluminum alloy sheet, the corrosion fatigue test of 5083P-O aluminum alloy sheet in 3.5% NaCl solution at 20-25 ℃was conducted, and the corrosion fatigue performances in the transverse and longitudinal directions with 106 cycles were obtained respectively. Then, the test data were processed and fitted by the least square method，and finally the S-N curves of transverse and longitudinal corrosion fatigue for 5083P-O aluminium alloy sheet were obtained. However, the transverse and longitudinal S-N curves indicate that the longitudinal corrosion fatigue limit of sheet is higher than the transverse corrosion fatigue limit. Furthermore, the microstructure of fatigue fracture was analyzed by SEM. The results show that the cause of corrosion fatigue fracture of aluminum alloy sheet is that the corrosive solution causes chemical corrosion on the surface of 5083P-O aluminum alloy specimen resulting in corrosion pits，the corrosion fatigue cracks are generated from the pits on metal surface, and then undergo expansion and rapid expansion until fracture.

Funds：

国家自然科学基金资助项目（51375500）；河北省自然科学基金资助项目（F201904029）；河北省高等学校科学技术研究青年基金项目（QN2018013,QN2019208）； 2017年河北省省级科技计划自筹经费项目（17211828）；2018年度张家口市科技计划财政资助项目（1811009B-10）；2018年度张家口市科技计划财政资助项目（1811009B-12）；河北建筑工程学院教师发展专项（2018SJ1002）；河北建筑工程学院教学改革研究项目（2018JY0005）

马立勇（1987-），男，硕士，讲师 E-mail：maliyongmail@foxmail.com 通讯作者：宋明星（1983-），男，硕士，讲师 E-mail：113711081@csu.edu.cn

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