Hardening in Au-Ag nanoboxes from stacking fault-dislocation interactions

Radhika P. Patil, David Doan, Zachary H. Aitken, Shuai Chen, Mehrdad T. Kiani, Christopher M. Barr, Khalid Hattar, Yong-Wei Zhang and X. Wendy Gu ()
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Radhika P. Patil: Stanford University
David Doan: Stanford University
Zachary H. Aitken: Institute of High Performance Computing, A*STAR
Shuai Chen: Institute of High Performance Computing, A*STAR
Mehrdad T. Kiani: Stanford University
Christopher M. Barr: Sandia National Laboratories
Khalid Hattar: Sandia National Laboratories
Yong-Wei Zhang: Institute of High Performance Computing, A*STAR
X. Wendy Gu: Stanford University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Porous, nano-architected metals with dimensions down to ~10 nm are predicted to have extraordinarily high strength and stiffness per weight, but have been challenging to fabricate and test experimentally. Here, we use colloidal synthesis to make ~140 nm length and ~15 nm wall thickness hollow Au-Ag nanoboxes with smooth and rough surfaces. In situ scanning electron microscope and transmission electron microscope testing of the smooth and rough nanoboxes show them to yield at 130 ± 45 MPa and 96 ± 31 MPa respectively, with significant strain hardening. A higher strain hardening rate is seen in rough nanoboxes than smooth nanoboxes. Finite element modeling is used to show that the structure of the nanoboxes is not responsible for the hardening behavior suggesting that material mechanisms are the source of observed hardening. Molecular dynamics simulations indicate that hardening is a result of interactions between dislocations and the associated increase in dislocation density.

Date: 2020
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DOI: 10.1038/s41467-020-16760-1

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