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Title: Radiation Effects on the Mechanical Properties of Nanoporous Gold.

Abstract

Abstract not provided.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1426532
Report Number(s):
SAND2017-2571C
651585
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the TMS 2017 held February 27 - March 31, 2017 in San Diego, Ca.
Country of Publication:
United States
Language:
English

Citation Formats

Hattar, Khalid Mikhiel, Briot, Nicholas, Balk, Thomas John, Hattar, Khalid Mikhiel, and Dingreville, Remi Philippe Michel. Radiation Effects on the Mechanical Properties of Nanoporous Gold.. United States: N. p., 2017. Web.
Hattar, Khalid Mikhiel, Briot, Nicholas, Balk, Thomas John, Hattar, Khalid Mikhiel, & Dingreville, Remi Philippe Michel. Radiation Effects on the Mechanical Properties of Nanoporous Gold.. United States.
Hattar, Khalid Mikhiel, Briot, Nicholas, Balk, Thomas John, Hattar, Khalid Mikhiel, and Dingreville, Remi Philippe Michel. Wed . "Radiation Effects on the Mechanical Properties of Nanoporous Gold.". United States. doi:. https://www.osti.gov/servlets/purl/1426532.
@article{osti_1426532,
title = {Radiation Effects on the Mechanical Properties of Nanoporous Gold.},
author = {Hattar, Khalid Mikhiel and Briot, Nicholas and Balk, Thomas John and Hattar, Khalid Mikhiel and Dingreville, Remi Philippe Michel},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Conference:
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  • It has recently been shown that due to a high surface-to-volume ratio, nanoporous materials display radiation tolerance. The abundance of surfaces, which are perfect sinks for defects, and the relation between ligament size, defect diffusion, and time combine to define a window of radiation resistance [Fu et al., Appl. Phys. Lett. 101, 191607 (2012)]. Outside this window, the dominant defect created by irradiation in Au nanofoams are stacking fault tetrahedra (SFT). Molecular dynamics computer simulations of nanopillars, taken as the elemental constituent of foams, predict that SFTs act as dislocation sources inducing softening, in contrast to the usual behavior inmore » bulk materials, where defects are obstacles to dislocation motion, producing hardening. In this work we test that prediction and answer the question whether irradiation actually hardens or softens a nanofam. Ne ion irradiations of gold nanofoams were performed at room temperature for a total dose up to 4 dpa, and their mechanical behavior was measured by nanoindentation. We find that hardness increases after irradiation, a result that we analyze in terms of the role of SFTs on the deformation mode of foams.« less
  • In this paper we present what we believe are the most pressing issues in understanding the mechanical behavior of nanoporous foams. We have postulated that a gold foam presents the best candidate for a systematic study of nanoporous foams since it can be synthesized with a wide range of ligaments sizes and densities. We have also conducted preliminary tests that demonstrate (a) Au foams have a fracture behavior dictated by the ligament size, and (b) nanoporous Au is a high yield strength material. Thus, we have demonstrated the potential in developing nanoporous foams as a new class of high yieldmore » strength/low density materials.« less
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