应力控制模式下疲劳损伤对AA7075-T651铝合金腐蚀行为影响的研究
Effect of Fatigue Damage Under Stress-controlled Mode on the Corrosion Behavior of AA7075-T651 Al-alloy
翁硕 1孟超 2朱江峰 3王艾 2常馨 2康妘 2何小田 2赵礼辉1
作者信息
- 1. 上海理工大学机械工程学院 上海 200093;机械工业汽车机械零部件强度与可靠性评价重点实验室 上海 200093;上海市新能源汽车可靠性评价公共技术平台 上海 200093
- 2. 上海理工大学机械工程学院 上海 200093
- 3. 苏州苏试试验集团有限公司 苏州 215129
- 折叠
摘要
通过AA7075-T651铝合金中断疲劳实验、含疲劳损伤试样的拉伸实验、电化学实验及微观结构观察等系统地探究了应力控制模式下疲劳损伤对其力学性能及腐蚀行为的影响.实验结果表明:应力控制模式下的疲劳损伤不仅可以提升AA7075铝合金的综合力学性能,还可以增加其耐腐蚀性,而疲劳损伤前后的微观结构变化(位错密度增加及二次相析出)是影响AA7075铝合金力学性能及腐蚀行为变化的根本原因.
Abstract
The effect of fatigue damage under stress-controlled mode on mechanical properties and corrosion behavior of AA7075-T651 Al-alloy was systematically investigated through the interrupted fa-tigue test,tensile test,electrochemical measurement and microstructure observation.The results show that the acquired fatigue damages can not only improve the comprehensive mechanical properties of AA7075 Al-alloy,but also increase its corrosion resistance.It follows that the change of microstructure(the increase of dislocation density and secondary phase precipitation)before and after being experi-enced fatigue damages is the fundamental reason that affects the mechanical properties and corrosion behavior of AA7075 Al-alloy.
关键词
应力控制模式/疲劳损伤/腐蚀行为/AA7075-T651铝合金Key words
stress-controlled mode/fatigue damage/corrosive behavior/AA7075-T651Al-alloy引用本文复制引用
出版年
2024
NETL
NSTL
万方数据