Effect of lattice defects on the plastic Poisson's ratio of nanoporous gold

被引：1

作者：

Cao, Luoxia ^{[1
]}

Zeng, Zhi ^{[2
]}

Fan, Feifei ^{[1
,3
]}

机构：

[1] Univ Nevada, Dept Mech Engn, Reno, NV 89557 USA

[2] Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA

[3] Univ Nevada, Nevada Inst Sustainabil, Reno, NV 89557 USA

来源：

SCRIPTA MATERIALIA | 2020年 / 185卷

关键词：

Nanoporous gold; Plastic Poisson's ratio; Tension-compression asymmetry; Molecular dynamics; EMBEDDED-ATOM-METHOD; YIELD STRENGTH; MECHANICAL RESPONSE; ULTRAHIGH STRENGTH; SCALING RELATIONS; METALS; AU; DEFORMATION; ASYMMETRY; BEHAVIOR;

D O I：

10.1016/j.scriptamat.2020.03.046

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanoporous gold (np-Au) exhibits variations in the value of the plastic Poisson's ratio, nu(p) - ranging from negative to positive - often for similar relative densities and ligament diameters. We investigate the effect of pre-existing lattice defects on nu(p) of np-Au using molecular dynamics simulations. Uniaxial compression of np-Au samples that have the same porous morphology, but distinct defect densities, shows that a high density of pre-existing defects reduces nu(p). We interpret this observation by linking nanoscale tension-compression asymmetry in individual ligaments to the synergistic interplay between defects and surfaces, and ultimately to the plastic transverse coupling in np-Au. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：175 / 180

页数：6

共 65 条

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