Title :

Stiffening of nanoporous gold: experiment, simulation and theory

Author(s) :

Melis, Claudio [Auteur correspondant]
Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari [UniCa]
Pia, Giorgio [Auteur]
Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari [UniCa]
Sogne, Elisa [Auteur]
King Abdullah University of Science and Technology [Saudi Arabia] [KAUST]
Falqui, Andrea [Auteur]
Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari [UniCa]
Giordano, Stefano [Auteur]
Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN [AIMAN-FILMS - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Delogu, Francesco [Auteur]
Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari [UniCa]
Colombo, Luciano [Auteur]
Università degli Studi di Cagliari = University of Cagliari = Université de Cagliari [UniCa]

Journal title :

The European Physical Journal Plus

Pages :

858

Publisher :

Springer

Publication date :

2022

ISSN :

2190-5444

HAL domain(s) :

Sciences de l'ingénieur [physics]

English abstract : [en]

By combining electron microscopy measurements, atomistic simulations and elastic homogenization theory, we theoretically investigate the Young’s modulus of nanoporous Au structures. Based on atomistic replicas generated ...
Show more >By combining electron microscopy measurements, atomistic simulations and elastic homogenization theory, we theoretically investigate the Young’s modulus of nanoporous Au structures. Based on atomistic replicas generated starting from experimental tomographic evidence, atomistic simulations reveal that nanoporous Au stiffens as ligaments become finer, reproducing experimental findings obtained by nanoindentation of dealloyed samples. We argue that such a stiffening is neither due to surface stress nor to grain boundaries. Instead, we observe a direct quantitative correlation between the density of dislocations found in the material phase of the nanoporous structures and their Young’s modulus and we propose a microscopic explanation of the observed stiffening. In particular, we show that local stress and strain fields in the neighborhood of dislocation cores allow dislocations to work as reinforcing solutes.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL