A critical relative density and a break-and-reconnect model for annealing-induced densification in nanoporous gold
文献类型：期刊论文
| 作者 | Xie, Hui1; Guan, Huai1,2; Liu, Ling-Zhi1; Jin, Hai-Jun1 |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 209页码:10 |
| 关键词 | Nanoporous Gold Coarsening Densification Pinch-off Relative density |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2021.116806 |
| 通讯作者 | Jin, Hai-Jun(hjjin@imr.ac.cn) |
| 英文摘要 | Single-crystal or coarse-grained nanoporous gold (NPG) prepared by dealloying is considered stable against sintering or densification during annealing. Herein, we report that this phenomenon only applies to high-density NPG with relative density (phi) exceeding a critical value of 0.31, which densifies very slightly during annealing. In low-density NPG with phi < 0.31, annealing induces excessive shrinkage that increases with decreasing v. Sintering along grain boundaries may account for the small densification of high-density NPG, but it fails to explain the excessive shrinkage of low-density NPG. This densification may be linked to ligament pinch-off, which dominates the coarsening of NPG with phi below similar to 0.30. However, ligament pinch-off does not directly lead to densification. Instead, we suggest that reattachment of dangling ligaments (generated by pinch-offs) is responsible for the large shrinkage in low-density NPG. This break-and-reconnect scenario is supported by quasi-in situ scanning electron microscopy observations and the evolution of scaled genus density for different type of NPGs during annealing. Our findings suggest that annealing-induced densification can be suppressed by increasing the relative density of NP metals to above 0.31, which is critical to many mechanical and functional explorations. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 资助项目 | National Natural Science Foundation of China[51971218] ; National Key R&D Program of China[2017YFA0204401] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000641587000002 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Natural Science Foundation of China ; National Key R&D Program of China |
| 源URL | [http://ir.imr.ac.cn/handle/321006/161784]  |
| 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, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xie, Hui,Guan, Huai,Liu, Ling-Zhi,et al. A critical relative density and a break-and-reconnect model for annealing-induced densification in nanoporous gold[J]. ACTA MATERIALIA,2021,209:10. |
| APA | Xie, Hui,Guan, Huai,Liu, Ling-Zhi,&Jin, Hai-Jun.(2021).A critical relative density and a break-and-reconnect model for annealing-induced densification in nanoporous gold.ACTA MATERIALIA,209,10. |
| MLA | Xie, Hui,et al."A critical relative density and a break-and-reconnect model for annealing-induced densification in nanoporous gold".ACTA MATERIALIA 209(2021):10. |
入库方式： OAI收割
来源：金属研究所
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