A critical relative density and a break-and-reconnect model for annealing-induced densification in nanoporous gold

doi:10.1016/j.actamat.2021.116806

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	A critical relative density and a break-and-reconnect model for annealing-induced densification in nanoporous gold
	Xie, Hui 1; Guan, Huai 1,2; Liu, Ling-Zhi 1; Jin, Hai-Jun 1
刊名	ACTA MATERIALIA
	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
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000641587000002
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China
内容类型	期刊论文
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.