Wang Shuxi, Sunkara Sai Varun, Manna Sukriti, Ahmadiparidari Alireza, Kumar Khagesh, Yang Taimin, Namvar Shahriar, Seraji Pardis, Huang Zhehao, Cabana Jordi, Sankaranarayanan Subramanian K R S, Liu Yuzi, Sumant Anirudha V, Salehi-Khojin Amin
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL, 60607, USA.
MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an, 710049, China.
Small. 2025 Apr;21(16):e2500322. doi: 10.1002/smll.202500322. Epub 2025 Mar 23.
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)S 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 mm (N∙m)) 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)S in ambient environments paves the way for the development of a new class of solid lubricants based on 2D HEA.
高熵合金（HEAs）因其卓越的摩擦学特性而备受关注。主要而言，高熵合金中的失效机制源于应力诱导的位错，最终导致裂纹扩展和薄膜分层。在本研究中，我们报道了（MoWNbTaV）S二维高熵合金的合成，该合金有助于在滑动界面处实现剪切诱导的能量耗散。球盘摩擦学研究表明，在环境条件下的高接触压力（0.936 GPa）下，平均摩擦系数（0.076）和磨损率（1(0^{-6}) (mm^3) /（N∙m））前所未有的低。通过多尺度表征和分子动力学模拟，我们阐明了高熵合金的存在会在高接触压力下引发摩擦催化活性，这是摩擦学测试中延长润滑剂寿命的关键因素。（MoWNbTaV）S在环境中的弹性润滑性以及简便的喷涂方法为基于二维高熵合金的新型固体润滑剂的开发铺平了道路。
