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Interpreting anomalous low-strength and low-stiffness of nanoporous gold: Quantification of network connectivity
Liu, LZ; Ye, XL; Jin, HJ; Jin, HJ (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2016-10-01
发表期刊ACTA MATERIALIA
ISSN1359-6454
卷号118页码:77-87
摘要The strength and elastic modulus of macroscopic nanoporous Au samples are much lower than that predicted by using Gibson-Ashby scaling laws. Here we attribute this discrepancy to a lowered network connectivity in nanoporous structure, and propose to modify the scaling equations (for both strength and stiffness) by introducing a concept of effective relative density. It is presented that the effective relative density can be determined by measuring the elasticity of nanoporous Au; under this scenario, the corrected strengths of Au nano-ligaments agree (on the order of magnitude) well with the previous data for similar-sized Au nanowires or nanopillars, which confirms our hypotheses. This study also revealed a low power-law exponent of size-dependent strength for Au nano-ligaments ( beta = -0.34) compared with that of Au submicron-pillars machined by focused ion beam (FIB) (beta = -0.61), which may be related to the critical roles of surface defects played in deformation. A ratio between effective relative density and relative density is suggested to quantify the network connectivity in nanoporous structure, which decreases rapidly during structure coarsening - it explains why most previous nanoporous Au samples, which more or less experienced coarsening, were unexpectedly soft. Current study also leads to some general strategies for syntheses of strong and stiff nanoporous metals. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属[liu, ling-zhi ; ye, xing-long ; jin, hai-jun] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china
关键词Nanoporous Gold Strength Elastic Modulus Scaling Equations Network Connectivity
学科领域Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者National Basic Research Program of China [2012CB932202]; National Natural Science Foundation of China [51171183, 51222105]; Key Research Program of Chinese Academy of Sciences [KGZD-EW-T06]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/76249
专题中国科学院金属研究所
通讯作者Jin, HJ (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.
推荐引用方式
GB/T 7714
Liu, LZ,Ye, XL,Jin, HJ,et al. Interpreting anomalous low-strength and low-stiffness of nanoporous gold: Quantification of network connectivity[J]. ACTA MATERIALIA,2016,118:77-87.
APA Liu, LZ,Ye, XL,Jin, HJ,&Jin, HJ .(2016).Interpreting anomalous low-strength and low-stiffness of nanoporous gold: Quantification of network connectivity.ACTA MATERIALIA,118,77-87.
MLA Liu, LZ,et al."Interpreting anomalous low-strength and low-stiffness of nanoporous gold: Quantification of network connectivity".ACTA MATERIALIA 118(2016):77-87.
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