Complexity analysis of the Portevin-Le Chatelier in an Al alloy at different tem peratures

• 作者: Jianfei Xu Guoxiong Chen Shihua Fu
• 来源期刊: 力学快报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Solid Mechanics
• 页码范围: 81-84
• 页数: 4页
• 语种: 英文
• DOI: 10.3969/j.issn.2095-0349.2021.02.004

摘要

The complexity of the Portevin-Le Chatelier (PLC) effect in an Al alloy at different temperatures was ana- lyzed by modified multiscale entropy. The results show that three evolutions of entropy with scale factor, i.e., near zero, monotonically increasing and peak-shape, were observed corresponding to the smooth curves, type-A serrations and type-B/-C serrations, respectively. The scale factor at the peak was one- third of the average serration period. The sample entropy increased initially and then decreased with temperature, which was opposite to the critical strain. It is also suggested that the type-A serrations cor- responded to self-organized criticality and the type-B/-C serrations corresponded to chaos through the evolutions of entropy with scale factor.