Complexity analysis of the Portevin-Le Chatelier in an Al alloy at different tem peratures
Complexity analysis of the Portevin-Le Chatelier in an Al alloy at different tem peratures
复制标题
不同温度下铝合金中 Portevin-Le Chatelier 的复杂性分析
DOI：
10.1016/j.taml.2021.100233
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发表时间：
2021
影响因子：
3.4
通讯作者：
Fu Shihua
中科院分区：
文献类型：
--
作者：
Xu Jianfei;Chen Guoxiong;Fu Shihua
采用修正的多尺度熵分析了铝合金在不同温度下的Portevin-Le Chatelier (PLC)效应的复杂性。结果表明，熵随尺度因子的演化有接近零、单调递增和峰形三种，分别对应于光滑曲线、A型锯齿和B/-C型锯齿，峰值处的尺度因子为平均锯齿周期的三分之一。熵随温度先增大后减小，与临界应变相反。通过熵随尺度因子的演化，A型锯齿对应于自组织临界性，B/-C型锯齿对应于混沌。
The complexity of the Portevin-Le Chatelier (PLC) effect in an Al alloy at different temperatures was analyzed 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 onethird 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 corresponded to self-organized criticality and the type-B/-C serrations corresponded to chaos through the evolutions of entropy with scale factor.