Transactions of Materials and Heat Treatment

Title：Comparative analysis on acoustic emission waveform characteristic for AZ31 magnesium alloy under unidirectional and alternating loads

Authors： He Xiuli Liang Hongyu Yan Zhifeng

Unit： Taiyuan Institute of Technology

KeyWords： magnesium alloy unidirectional load alternating load acoustic emission waveform characteristic

ClassificationCode：TH142.3

year,vol(issue):pagenumber：2021,46(8):193-198

Abstract：

The whole test process of AZ31 magnesium alloy under unidirectional and alternating loads was monitored by acoustic emission technology, its acoustic emission waveform characteristics were comparied and analyzed, and the influences of the generation and change of plastic deformation on the acoustic emission waveform characteristics of magnesium alloy were discussed. The results show that the different plastic deformations are produced by different load conditions, which have an important influence on the acoustic emission waveform characteristics of magnesium alloy. Compared with the unidirectional load, the acoustic emission waveform of AZ31 magnesium alloy under alternating load has the characteristics of obvious periodicity and step phenomenon, which are related to crack closure effect and material plastic deformation damage, respectively. Moreover, the average amplitude of continuous acoustic emission waveform for AZ31 magnesium alloy under alternating load is about 80 mV higher than that under unidirectional load. In addition to the accumulation of plastic damage, there is also the effect of large background noise in the external test environment under alternating load.

Funds：

国家自然科学基金资助项目(51705350)；山西省高等学校科技创新项目(2019L0922)；山西省青年科技研究基金项目（201801D221137）

贺秀丽(1985-)，女，博士，副教授 E-mail：good.168@126.com 通信作者：梁红玉（1968-），女，博士，教授 E-mail：285824749@qq.com

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