A critical review on the Portevin-Le Chatelier effect in aluminum alloys
A critical review on the Portevin-Le Chatelier effect in aluminum alloys
复制标题
DOI：
10.1007/s11771-022-4977-x
复制
发表时间：
2022-03
影响因子：
4.4
通讯作者：
Peng Zhang;Gang Liu;Jun Sun
中科院分区：
文献类型：
--
作者：
Peng Zhang;Gang Liu;Jun Sun
由于其在许多工业过程中的重要性，表现出不稳定性的塑性变形几个世纪以来一直受到广泛关注。对于铝合金来说，主要的不稳定性是在一定的应变、应变速率和温度范围内出现的 Portevin-Le Chatelier (PLC) 效应。它在应力-应变曲线上表现为锯齿状，与倾斜滑移带内塑性变形的快速积累相关。 PLC效应具有严重的实际后果，它会损害金属板材成形加工后的表面质量并威胁拉伸延展性。因此，研究 PLC 效应的基本机制至关重要，特别是研究如何通过定制材料微观结构来对其进行回火。在本文中，我们回顾了PLC效应的常见解释，并总结了铝合金中两种传统强化方法沉淀和晶粒细化对锯齿状塑性流动影响的实验结果。强调了溶质原子团簇在抑制 PLC 效应方面的有效性。
The plastic deformation showing instability has been a subject receiving considerable attention for centuries due to its importance in many industrial processes. For Al alloys, the major instability is the Portevin-Le Chatelier (PLC) effect that appears within a certain region of strain, strain rate and temperature. It manifests itself on the stress — strain curve as serrations associating with the rapid accumulation of plastic deformation within inclined slip bands. The PLC effect has severe practical consequences, which damages the surface quality after the sheet metal forming process and threatens the tensile ductility. Therefore, it is crucial to investigate the fundamental mechanisms underlying the PLC effect and in particular to investigate how it can be tempered by tailoring the material microstructure. In this paper, we review the common interpretations of the PLC effect and summarize the experimental results of the effects of the precipitation and the grain refinement, two conventional strengthening methodologies in Al alloys, on the serrated plastic flow. The effectiveness of solute atom clusters in suppressing the PLC effect is emphasized.