Self‐Lubricating Tribo‐Catalytic Activity of 2D High Entropy Alloy Nanoflakes
High Entropy Alloys (HEAs) have garnered attention due to their remarkable tribological attributes. Predominantly, failure mechanisms in HEAs emanate from stress-induced dislocations, culminating in crack propagation and film delamination. In this study, we report on the synthesis of 2D HEA of (MoWNbTaV)<sub>0.2</sub>S<sub>2</sub> which facilitates shear-induced energy dissipation at sliding interfaces. The ball-on-disk tribological investigations demonstrate unprecedentedly low average coefficients of friction (0.076) and wear rates (10<sup>-9</sup> mm<sup>3</sup> (N∙m)<sup>-1</sup>) under high contact pressures (0.936 GPa) within ambient conditions. Employing multi-scale characterizations alongside molecular dynamic simulations, we elucidate that the presence of the HEA triggers tribocatalytic activity under high contact pressures emerging as a pivotal factor in extending lubricant lifespan during tribological tests. The resilient lubriciousness coupled with the facile spray coating methodology of (MoWNbTaV)<sub>0.2</sub>S<sub>2</sub> in ambient environments paves the way for the development of a new class of solid lubricants based on 2D HEA.
Authors
- Khagesh Kumar (ORCID: https://orcid.org/0000-0001-8010-0877)
- Anirudha V. Sumant (ORCID: https://orcid.org/0000-0002-6028-0038)
- Zhehao Huang (ORCID: https://orcid.org/0000-0002-4575-7870)
- Amin Salehi‐Khojin (ORCID: https://orcid.org/0000-0002-0588-8964)
- Jordi Cabana (ORCID: https://orcid.org/0000-0002-2353-5986)
- Shahriar Namvar (ORCID: https://orcid.org/0009-0009-3441-3325)
- Yuzi Liu (ORCID: https://orcid.org/0000-0002-8733-1683)
- Sukriti Manna (ORCID: https://orcid.org/0000-0002-3193-7803)
- Subramanian K. R. S. Sankaranarayanan (ORCID: https://orcid.org/0000-0002-9708-396X)
- Shuxi Wang (ORCID: https://orcid.org/0000-0002-1789-4376)
- Alireza Ahmadiparidari (ORCID: https://orcid.org/0000-0003-1819-204X)
- Taimin Yang (ORCID: https://orcid.org/0000-0003-4318-8990)
- Pardis Seraji (ORCID: https://orcid.org/0009-0003-0490-9609)
- Sree Maneesha Sunkara
Institutions
- Argonne National Laboratory (US)
- Stockholm University (SE)
- Southern Methodist University (US)
- University of Illinois Chicago (US)
- Xi'an Jiaotong University (CN)
Publication Details
- Journal
- Small
- Published
- 2025-03-23
- DOI
- https://doi.org/10.1002/smll.202500322
- Citations
- 5
- Primary Topic
- High Entropy Alloys Studies
- Type
- article
- Field-Weighted Citation Impact
- 3.57
Funders
- National Science Foundation
- Svenska Forskningsrådet Formas
- Basic Energy Sciences