文献类型：期刊文献

中文题名：稀土镁合金热损伤的非线性Lamb波检测

英文题名：Nonlinear Lamb wave detection for thermal damage in rare earth magnesium alloys

作者：沈郅琦[1];孙京丽[2];朱武军[1];肖飚[3];项延训[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]上海航天精密机械研究所,上海201600;[3]上海市特种设备监督检验技术研究院,上海200062

年份：2025

卷号：44

期号：6

起止页码：910

中文期刊名：声学技术

外文期刊名：Technical Acoustics

收录：;北大核心:【北大核心2023】；

基金：中国航天科技集团公司第八研究院产学研合作基金资助项目;上海市市场监督管理局科技项目(2024-46);国家自然科学基金(12327807、12004114)。

语种：中文

中文关键词：稀土镁合金;热损伤;非线性超声;Lamb波

外文关键词：rare earth magnesium alloys;thermal damage;nonlinear ultrasonic;Lamb wave

摘要：航空航天领域的高温服役环境会使稀土镁合金产生热损伤,导致结构性能下降,开展稀土镁合金高温热损伤的检测表征对保障设备运行安全具有重要意义。对VW63Z稀土镁合金进行200℃热时效实验,制备不同热损伤程度的试样。根据非线性Lamb波共振条件确定具有积累效应的兰姆(Lamb)波S1-s2模式对,开展非线性超声测量实验,并结合透射电镜观察,定量分析了非线性参数变化的微观机制。结果表明,归一化非线性参量随镁合金热损伤单调增长,热时效时间为192 h时非线性参量为初始值的151.5%。VW63Z镁合金热时效析出序列为β''-β'-β,三种析出相交替析出,期间发生结构改变和尺寸粗化,导致β''、β'和β三类析出相与基体相间产生晶格失配,引起归一化非线性参量随热时效时间累积增大。研究结果表明非线性超声可以有效表征稀土镁合金高温热损伤。
The high-temperature service environment in the aerospace field may cause thermal damage to rare-earthmagnesium alloys,which leads to the deterioration of structural properties.The detection and characterization of rare-earth magnesium alloys with high-temperature thermal damage is of great significance to ensure the safety ofequipment operation.Thermal aging tests were carried out at a temperature of 200°C to obtain specimens withdifferent degrees of thermal damage.The nonlinear ultrasonic measurement experiment was performed using theselected Lamb wave S1-s2 mode pair with accumulation effect according to the nonlinear Lamb wave resonanceconditions.Combined with the microstructure observation of heat-damaged specimens using transmission electronmicroscopy,the microscopic mechanism of nonlinear parameter change was analyzed quantitatively.The results showthat the normalized nonlinear parameter increases monotonically with the thermal damage of magnesium alloys,andthe nonlinear parameter is 151.5%of the initial value when the thermal aging time is 192 h.The thermal agingprecipitation sequence of VW63Z magnesium alloys isβ''-β'-β,where the three precipitates alternately precipitate.During this period,structural changes and size coarsening lead to lattice mismatch between the precipitated phases andthe matrix phase,resulting in accumulative growth of the normalized nonlinear parameter with the thermal aging time.The research results show that nonlinear ultrasonics can effectively characterize high-temperature thermal damage ofmagnesium alloys.