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
收藏
页码：175 / 180
页数：6
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