声发射
材料科学
收缩率
复合材料
振幅
气泡
等离子体
脉冲持续时间
脉搏(音乐)
复合数
机械
光学
量子力学
探测器
物理
激光器
作者
Yizhao Liao,Qian Zhou,Chuanli Gao,Hui Li,Chi Xu,Xiaoyue Jin,Jiancheng Du,Wenbin Xue,Yongzhong Zhang
出处
期刊:Ultrasonics
[Elsevier]
日期:2024-03-01
卷期号:138: 107213-107213
被引量:1
标识
DOI:10.1016/j.ultras.2023.107213
摘要
The initial discharge process of pulsed plasma electrolytic oxidation (PEO) on the 60% SiCp/2009 aluminum metal matrix composite (Al MMC) in silicate solution was monitored by acoustic emission (AE) technique. Parameters and correlations of AE signals on the Al MMC sample and under water were analyzed, and their generation mechanism was discussed. It was found that the peak amplitudes of AE signals and AE hits during the pulse time quickly increased with the increase of micro-discharge intensity, and the absolute energy of AE signals improved several orders of magnitude. Moreover, different from the peak amplitude, duration and rise time, the duration and count had a strong correlation. Elastic stress waves resulted from the microjet of plasma bubble collapse, the inner-surface friction inside discharge channel, the expansion-shrinkage process of plasma bubbles and micro-crack propagation during rapid solidification of melt are sources of AE signals on the Al MMC sample during the pulse time. However, the expansion-shrinkage process of plasma bubbles plays a key role in the generation of underwater AE signals. In the pause time of one pulse period, the bursting and moving of vapor bubbles result in weak AE signals. It is demonstrated that the AE technique can effectively characterize the features of micro-discharges within a pulse period.
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