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A universal scaling relationship between the strength and Young's modulus of dealloyed porous Fe0.80Cr0.20
Xiang, Yi-Hou1,2; Liu, Ling-Zhi1; Shao, Jun-Chao1; Jin, Hai-Jun1
Corresponding AuthorJin, Hai-Jun(hjjin@imr.ac.cn)
2020-03-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume186Pages:105-115
AbstractThe 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.
KeywordLiquid metal dealloying Porous materials Fe-Cr Scaling laws Connectivity
Funding OrganizationNational Key R&D Program of China ; National Natural Science Foundation of China
DOI10.1016/j.actamat.2019.12.046
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFA0204401] ; National Natural Science Foundation of China[51571206] ; National Natural Science Foundation of China[51401213]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000518698300010
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/137800
Collection中国科学院金属研究所
Corresponding AuthorJin, Hai-Jun
Affiliation1.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
Recommended Citation
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.
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