Hidden order in serrated flow of metallic glasses
文献类型：期刊论文
| 作者 | Sarmah, R ; Ananthakrishna, G ; Sun, BA ; Wang, WH |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2011 |
| 卷号 | 59期号:11页码:4482 |
| 关键词 | SELF-ORGANIZED CRITICALITY LE-CHATELIER BANDS TIME-SERIES JERKY FLOW PLASTIC-DEFORMATION ROOM-TEMPERATURE POISSONS RATIO SHEAR-BAND MODEL DYNAMICS |
| ISSN号 | 1359-6454 |
| 通讯作者 | Ananthakrishna, G: Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India. |
| 中文摘要 | We report results of statistical and dynamic analysis of the serrated stress-time curves obtained from compressive constant strain-rate tests on two metallic glass samples with different ductility levels in an effort to extract hidden information in the seemingly irregular serrations. Two distinct types of dynamics are detected in these two alloy samples. The stress-strain curve corresponding to the less ductile Zr(65)Cu(15)Ni(10)Al(10) alloy is shown to exhibit a finite correlation dimension and a positive Lyapunov exponent, suggesting that the underlying dynamics is chaotic. In contrast, for the more ductile Cu(47.5)Zr(47.5)Al(5) alloy, the distributions of stress drop magnitudes and their time durations obey a power-law scaling reminiscent of a self-organized critical state. The exponents also satisfy the scaling relation compatible with self-organized criticality. Possible physical mechanisms contributing to the two distinct dynamic regimes are discussed by drawing on the analogy with the serrated yielding of crystalline samples. The analysis, together with some physical reasoning, suggests that plasticity in the less ductile sample can be attributed to stick-slip of a single shear band, while that of the more ductile sample could be attributed to the simultaneous nucleation of a large number of shear bands and their mutual interactions. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| 资助信息 | Department of Atomic Energy; BRNS [2007/36/62-BRNS/2564]; CSIR India; NSF of China [50731008, 50921091]; Most [2010CB731603] |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/39154]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Sarmah, R,Ananthakrishna, G,Sun, BA,et al. Hidden order in serrated flow of metallic glasses[J]. ACTA MATERIALIA,2011,59(11):4482. |
| APA | Sarmah, R,Ananthakrishna, G,Sun, BA,&Wang, WH.(2011).Hidden order in serrated flow of metallic glasses.ACTA MATERIALIA,59(11),4482. |
| MLA | Sarmah, R,et al."Hidden order in serrated flow of metallic glasses".ACTA MATERIALIA 59.11(2011):4482. |
入库方式： OAI收割
来源：物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。