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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Observations of serration characteristics and acoustic emission during serrated flow of an Al-Mg alloy
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Observations of serration characteristics and acoustic emission during serrated flow of an Al-Mg alloy

机译：铝镁合金锯齿状流动过程中锯齿状特征和声发射的观察

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摘要

Study of serrated flow is important for the production of metal alloy parts with smooth surfaces and for fundamental understanding of microscale plastic deformation. In this experimental investigation of a rolled Al-Mg alloy, serrated flow was observed for the entire plastic flow region at three different strain rates. Strain and strain rate dependent serration amplitudes and widths were quantified. In addition, the acoustic emission (AE) signature from the plastic flow region was analyzed in detail and was related to the serrations in the macroscopic stress versus strain results. For all experiments, deformation bands on the surfaces of the specimens were found to be consistent with 'Type B' serrations. Video observations of the deformation bands were synchronized with the AF, and the deformation bands were found to coincide with more persistent AF bursts and anomalies in the serrations.
机译：锯齿状流的研究对于生产具有光滑表面的金属合金零件以及对微观塑性变形的基本了解非常重要。在对轧制的Al-Mg合金进行的这项实验研究中，在三个不同的应变速率下，整个塑性流动区域均观察到锯齿状流动。量化了应变和应变率相关的锯齿幅度和宽度。此外，对塑性流动区域的声发射（AE）信号进行了详细分析，并且与宏观应力与应变结果中的锯齿有关。对于所有实验，发现样品表面的变形带与“ B型”锯齿一致。变形带的视频观察与AF同步，并且发现变形带与更持久的AF爆发和锯齿异常一致。

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