(1. 太原工业学院 机械工程系,太原 030008;
2. 太原理工大学 材料科学与工程学院,太原 030024)
摘 要: 利用声发射技术对AZ31镁合金在不同环境(腐蚀、疲劳载荷)下进行实时监测分析,研究表明:腐蚀疲劳耦合作用下与疲劳载荷作用下相比,镁合金声发射波形都表现出周期性、台阶性及瞬断突发型等特点,但不同的是二者周期性波形形状不同,腐蚀疲劳耦合作用下镁合金声发射周期性波形平均波幅降低50%、波幅台阶性现象趋缓。这主要是由于周围腐蚀环境的存在有助于缓解疲劳损伤的累积。
关键字: AZ31镁合金;声发射波形;腐蚀环境;疲劳载荷
(1. Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China;
2. College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
Abstract:AE technology, which is known for nondestructive and in-service monitoring through corrosive environment, was used to monitor the AZ31 magnesium alloy under different environment (corrosion, fatigue loading) real-timely. The results show that, under the coupled action of corrosion fatigue, compared with that under fatigue loading only, the AE waveforms displays some characteristics, such as cyclicity, steps and transient breaking. But their shapes are different. Due to the presence of the ambient corrosive environment, which helps to mitigate the accumulation of fatigue damage, the average amplitude of periodic waveform under the coupled action reduces by 50%, and the step characteristic becomes slow.
Key words: AZ31 magnesium alloy; acoustic emission waveform; corrosive environment; fatigue loading