A universal scaling relationship between the strength and Young's modulus of dealloyed porous Fe0.80Cr0.20
文献类型：期刊论文
| 作者 | Xiang, Yi-Hou1,2; Liu, Ling-Zhi1; Shao, Jun-Chao1; Jin, Hai-Jun1 |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2020-03-01 |
| 卷号 | 186页码:105-115 |
| 关键词 | Liquid metal dealloying Porous materials Fe-Cr Scaling laws Connectivity |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2019.12.046 |
| 通讯作者 | Jin, Hai-Jun(hjjin@imr.ac.cn) |
| 英文摘要 | The fact that ligament strength is strongly affected by size has become an obstacle to understanding the relationship between structural topology and mechanical response of dealloyed nanoporous metals. Herein we studied the mechanical properties of porous Fe0.80Cr0.20 prepared by liquid metal dealloying. The ligament diameters of these samples are stabilized at similar to 4 mu m, so that the ligament strength is constant in all samples. The variation of strength (or flow stress) and Young's modulus with relative density, on a log-log scale, is nonlinear. Both properties decrease more steeply with decreasing relative density at lower relative density. These results are similar to the observations in nanoporous gold prepared by (electro)chemical dealloying but deviate from Gibson-Ashby (G-A) scaling laws. However, the strength of the porous Fe0.80Cr0.20 plotted against the Young's modulus on a log-log scale exhibits a linear relation in the full range, with a slope of similar to 3/4 that matches perfectly with the standard G-A prediction. This confirms the significant role played by "dangling ligaments" in the deformation of dealloyed porous materials: Coarsening-induced pinch-off of some ligaments is responsible for the anomalously low strength and stiffness of dealloyed porous materials; the load-bearing network remains self-similar, and its mechanical response follows the standard G-A scaling laws, despite the fact that the porous material itself may not do so. Our study confirms that, for dealloyed porous materials, the G-A scaling relations are valid if the apparent relative density or, alternatively, genus density-related prefactors are introduced. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 资助项目 | National Key R&D Program of China[2017YFA0204401] ; National Natural Science Foundation of China[51571206] ; National Natural Science Foundation of China[51401213] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000518698300010 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Key R&D Program of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.imr.ac.cn/handle/321006/137799]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Jin, Hai-Jun |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xiang, Yi-Hou,Liu, Ling-Zhi,Shao, Jun-Chao,et al. A universal scaling relationship between the strength and Young's modulus of dealloyed porous Fe0.80Cr0.20[J]. ACTA MATERIALIA,2020,186:105-115. |
| APA | Xiang, Yi-Hou,Liu, Ling-Zhi,Shao, Jun-Chao,&Jin, Hai-Jun.(2020).A universal scaling relationship between the strength and Young's modulus of dealloyed porous Fe0.80Cr0.20.ACTA MATERIALIA,186,105-115. |
| MLA | Xiang, Yi-Hou,et al."A universal scaling relationship between the strength and Young's modulus of dealloyed porous Fe0.80Cr0.20".ACTA MATERIALIA 186(2020):105-115. |
入库方式： OAI收割
来源：金属研究所
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。