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Citation link: https://doi.org/10.26092/elib/2228

Publisher DOI: https://doi.org/10.1002/adma.201906160
Okulov_Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design_2019.pdf
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Beating Thermal Coarsening in Nanoporous Materials via High-Entropy Design


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Authors: Joo, Soo-Hyun 
Bae, Jae Wung  
Park, Won-Young 
Shimada, Yusuke  
Wada, Takeshi  
Kim, Hyoung Seop  
Takeuchi, Akira  
Konno, Toyohiko J. 
Kato, Hidemi  
Okulov, Ilya  
Abstract: 
Controlling the feature sizes of 3D bicontinuous nanoporous (3DNP) materials is essential for their advanced applications in catalysis, sensing, energy systems, etc., requiring high specific surface area. However, the intrinsic coarsening of nanoporous materials naturally reduces their surface energy leading to the deterioration of physical properties over time, even at ambient temperatures. A novel 3DNP material beating the universal relationship of thermal coarsening is reported via high-entropy alloy (HEA) design. In newly developed TiVNbMoTa 3DNP HEAs, the nanoporous structure is constructed by very fine nanoscale ligaments of a solid-solution phase due to enhanced phase stability by maximizing the configuration entropy and suppressed surface diffusion. The smallest size of 3DNP HEA synthesized at 873 K is about 10 nm, which is one order of magnitude smaller than that of conventional porous materials. More importantly, the yield strength of ligament in 3DNP HEA approaches its theoretical strength of G/2π of the corresponding HEA alloy even after thermal exposure. This finding signifies the key benefit of high-entropy design in nanoporous materials—exceptional stability of size-related physical properties. This high-entropy strategy should thus open new opportunities for developing ultrastable nanomaterials against its environment.
Keywords: Liquid metal dealloying; nanoporous high-entropy alloys; size-dependent strength; thermal coarsening; thermodynamic calculation
Issue Date: 2020
Publisher: Wiley
Journal/Edited collection: Advanced Materials 
Type: Artikel/Aufsatz
ISSN: 0935-9648
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2228
URN: urn:nbn:de:gbv:46-elib69073
Institution: Universität Bremen 
Faculty: Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04) 
Zentrale Wissenschaftliche Einrichtungen und Kooperationen 
Institute: Institut für Werkstofftechnik (IWT) 
Appears in Collections:Forschungsdokumente

  

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