Scaling equation for yield strength of nanoporous open-cell foams

被引:315
作者
Hodge, A. M.
Biener, J.
Hayes, J. R.
Bythrow, P. M.
Volkert, C. A.
Hamza, A. V.
机构
[1] Lawrence Livermore Natl Lab, Nanoscale Synth & Characterizat Lab, Livermore, CA 94550 USA
[2] Forschungszentrum Karlsruhe, Inst Mat Forsch 2, D-76021 Karlsruhe, Germany
关键词
nanoporous; foams; nanoindentation; dealloying;
D O I
10.1016/j.actamat.2006.09.038
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A comprehensive study on the relationship between yield strength, relative density and ligament sizes is presented for nanoporous An foams. Depth-sensing nanoindentation tests were performed on nanoporous foams ranging from 20% to 42% relative density with ligament sizes ranging from 10 to 900 nm. The Gibson and Ashby yield strength equation for open-cell macrocellular foams is modified in order to incorporate ligament size effects. This study demonstrates that, at the nanoscale, foam strength is governed by ligament size, in addition to relative density. Furthermore, we present the ligament length scale as a new parameter to tailor foam properties and achieve high strength at low densities. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:1343 / 1349
页数:7
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