The Mechanical Response of Nanoporous Gold and Silver Foams with Varying Composition and Surface Segregation

被引：15

作者：

Beets, Nathan ^{[1
]}

Farkas, Diana ^{[1
]}

Albe, Karsten ^{[2
]}

机构：

[1] Virginia Tech, Dept Mat Sci & Engn, Holden Hall,445 Old Turner St 213, Blacksburg, VA 24060 USA

[2] Tech Univ Darmstadt, Dept Mat Sci, Mat Modeling Div, Otto Berndt Str 3, D-64287 Darmstadt, Germany

来源：

ACTA MATERIALIA | 2021年 / 203卷

基金：

美国国家科学基金会;

关键词：

DISLOCATION NUCLEATION; YIELD STRENGTH; DEFORMATION MECHANISMS; SCALING RELATIONS; METALS; SIZE; NANOSTRUCTURE; PLASTICITY; ASYMMETRY; BEHAVIOR;

D O I：

10.1016/j.actamat.2020.10.064

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanical response of an Au-Ag nanoporous foam is studied via molecular dynamics simulations, while segregation effects are captured by a Monte-Carlo simulation scheme. The addition of silver to nanoporous Au structures increases the strength of the foams. Dislocation evolution in alloyed and pure elemental structures is analyzed. We find that the yielding behavior is dependent on surface compositions and the corresponding capillary forces, while elastic behavior is dependent on bulk composition. Trends in the yield response of this material as a function of size and surface composition are effectively predicted with a model that accounts for surface effects. (C) 2020 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

引用

页数：9

共 64 条

[1] Nanoindentation into a high-entropy alloy - An atomistic study [J].

Alhafez, Iyad Alabd ;

Ruestes, Carlos J. ;

Bringa, Eduardo M. ;

Urbassek, Herbert M. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2019, 803 :618-624

[2]

[Anonymous], 1986, EMBEDDED ATOM METHOD

[3] Mechanical properties of nanoporous gold in tension [J].

Badwe, Nilesh ;

Chen, Xiying ;

Sieradzki, Karl .

ACTA MATERIALIA, 2017, 129 :251-258

[4] Tensile and Compressive Microspecimen Testing of Bulk Nanoporous Gold [J].

Balk, T. John ;

Eberl, Chris ;

Sun, Ye ;

Hemker, Kevin J. ;

Gianola, Daniel S. .

JOM, 2009, 61 (12) :26-31

[5] Deformation mechanisms and scaling relations in the mechanical response of nano-porous Au [J].

Beets, Nathan ;

Farkas, Diana ;

Corcoran, Sean .

ACTA MATERIALIA, 2019, 165 :626-637

[6] Mechanical Response of Au Foams of Varying Porosity from Atomistic Simulations [J].

Beets, Nathan ;

Farkas, Diana .

JOM, 2018, 70 (10) :2185-2191

[7] Nanoporous Au: A high yield strength material [J].

Biener, J ;

Hodge, AM ;

Hamza, AV ;

Hsiung, LM ;

Satcher, JH .

JOURNAL OF APPLIED PHYSICS, 2005, 97 (02)

[8]

Biener J, 2009, NAT MATER, V8, P47, DOI [10.1038/nmat2335, 10.1038/NMAT2335]

[9] Size effects on the mechanical behavior of nanoporous Au [J].

Biener, Juergen ;

Hodge, Andrea M. ;

Hayes, Joel R. ;

Volkert, Cynthia A. ;

Zepeda-Ruiz, Luis A. ;

Hamza, Alex V. ;

Abraham, Farid F. .

NANO LETTERS, 2006, 6 (10) :2379-2382

[10] Developing scaling relations for the yield strength of nanoporous gold [J].

Briot, Nicolas J. ;

Balk, T. John .

PHILOSOPHICAL MAGAZINE, 2015, 95 (27) :2955-2973

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