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Effect of equal channel angular pressing on the Portevin-Le Chatelier effect in an Al3Mg alloy

机译：等通道角挤压对Al3Mg合金中Portevin-Le Chatelier效应的影响

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摘要

Plastic deformation of alloys is often accompanied with discontinuous flow known as the Portevin-Le Chatelier (PLC) instability. Recent studies of mechanical behavior of alloys subjected to severe plastic deformation (SPD) revealed different forms this phenomenon can take as a result of grain refinement. In the present work, it is reported that SPD may effectively suppress the macroscopic stress serrations characteristic of the PLC effect. At the same time, small-scale stress fluctuations can still be resolved on the deformation curves. To investigate their nature, stress vs time curves for an Al3Mg alloy processed by equal channel angular pressing (ECAP) are compared with those obtained for the initial coarse-grained (CG) material, using statistical and multifractal approaches to multi-scale analysis of time series. An interpretation of the results in terms of the concurrency of phenomena of self-organized criticality and synchronization in the dislocation system is proposed.
机译：合金的塑性变形通常伴随着不连续的流动，称为Portevin-Le Chatelier（PLC）不稳定性。对合金进行严重塑性变形（SPD）的力学行为的最新研究表明，这种现象可通过晶粒细化而采用不同的形式。在目前的工作中，据报道SPD可以有效地抑制PLC效应的宏观应力锯齿特征。同时，仍然可以在变形曲线上解决小范围的应力波动。为了研究它们的性质，使用统计和多分形方法对时间进行多尺度分析，将通过等通道转角挤压（ECAP）处理的Al3Mg合金的应力与时间曲线与从初始粗晶粒（CG）材料获得的应力-时间曲线进行比较。系列。提出了根据位错系统中自组织临界现象和同步现象的并发性来解释结果的方法。

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