Journal article
Mechanical properties of nanocrystalline nanoporous platinum
Acta materialia, v 103(C), pp 624-632
15 Jan 2016
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The mechanical behavior of nanocrystalline, nanoporous platinum (NP Pt) is investigated using a combination of experimental measurements and molecular dynamics (MD) simulations. The NP Pt considered in this work is characterized by an hierarchical internal structure with comparable characteristic strut thickness t and grain size D. The hardness of NP Pt with typical strut thickness t= 2-10 nm is measured by nanoindentation experiments to be H-f =0.2-1.3 GPa. Using standard scaling assumptions, a characteristic individual strut strength can be estimated from the hardness measurements as sigma(s) = 0.3-2.5 GPa. These values compare reasonably well with the ones obtained from MD simulations of isolated struts, represented as nanowires with crystalline structure similar to the experimentally observed NP Pt. The findings suggest that for nanocrystalline NP structures with t D the strength of individual struts decreases gradually with decreasing strut size, so that the overall mechanical strength remains relatively high. The simulations provide insight into the underlying deformation mechanisms and behavior within the struts during mechanical loading. In particular, as struts decrease in size, they accommodate strain primarily through grain boundary plasticity, such as sliding. However, as strut size increases, dislocations begin to play a larger role in accommodating strain. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Details
- Title
- Mechanical properties of nanocrystalline nanoporous platinum
- Creators
- Ran Liu - Georgia Institute of TechnologyJacob Gruber - Drexel UniversityDhriti Bhattacharyya - Australian Nucl Sci & Technol Org, Inst Mat Engn, Lucas Heights, NSW 2234, AustraliaGarritt J. Tucker - Drexel UniversityAntonia Antoniou - Georgia Institute of TechnologyDebjani Bhattacharyya - History
- Publication Details
- Acta materialia, v 103(C), pp 624-632
- Publisher
- Elsevier
- Number of pages
- 9
- Grant note
- CMMI-1301268; CMMI-1351705; DMR-1410970 / NSF; National Science Foundation (NSF) 1351705 / Directorate For Engineering; National Science Foundation (NSF); NSF - Directorate for Engineering (ENG) DE-AC52-06NA25396 / U.S. Department of Energy (DOE) Office of Science; United States Department of Energy (DOE) GAANN; US Department of Education 1748130 / Division Of Materials Research; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- History
- Web of Science ID
- WOS:000367630500061
- Scopus ID
- 2-s2.0-84947274140
- Other Identifier
- 991019173589404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering