Article
Chemistry, Physical
Chi Jin, Xiaolin Li, Haozhe Li, Qian Li, Haifeng Wang
Summary: Refractory high-entropy alloys (RHEAs), such as Ti-Zr-Nb-Mo, have gained attention for their high-temperature resistance, mechanical properties, and wear performance. This study focused on investigating the microstructure, oxidation resistance, tribological properties, and mechanisms of TiZrNbMo0.6 RHEA. The results showed that the alloy exhibited optimal wear resistance through the formation of a compacted and continuous glaze layer at 500 degrees C. The wear mechanism evolved with temperature, transitioning from abrasive wear and adhesive wear at room temperature to oxidative wear and slight abrasive wear at 500 degrees C. At 800 degrees C, severe oxidative wear became the dominant mechanism, accompanied by partial abrasive wear, resulting in a higher wear rate compared to 500 degrees C.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Mechanical
Cuong Nguyen, Anh Kiet Tieu, Guanyu Deng, David Wexler, Tri Dinh Vo, Long Wang, Jun Yang
Summary: A cost-effective self-lubricating composite material based on CrFeNiAl0.3Ti0.3 as the matrix and Ag as the solid lubricant has been fabricated. Tribological tests show that the presence of Ag tribo-film reduces the coefficient of friction and wear of the composites from room temperature to 600 degrees C. The wear mechanism changes from abrasive to oxidative wear at 750 degrees C.
TRIBOLOGY INTERNATIONAL
(2022)
Review
Chemistry, Physical
Ashish K. Kasar, Kelsey Scalaro, Pradeep L. Menezes
Summary: The article provides a review on the tribological performance of high-entropy alloys (HEAs), highlighting the influence of crystal structure on wear rate and the superior hardness and wear properties of HEAs with a BCC structure. Temperature and other factors such as grain size, formation of an oxide layer, and wear mechanisms are also discussed.
Article
Engineering, Mechanical
Maryam Sadeghilaridjani, Mayur Pole, Shristy Jha, Saideep Muskeri, Nandita Ghodki, Sundeep Mukherjee
Summary: Refractory high-entropy alloys are promising structural materials for high temperature applications, but their high temperature deformation behavior and tribological response are still not well understood. This study evaluated the temperature dependence of strain rate sensitivity and wear behavior for two refractory high-entropy alloys, HfNbTiZr and HfNbTaTiZr. Results showed that HfNbTaTiZr had higher hardness, strength, and lower strain rate sensitivity compared to HfNbTiZr, and wear rate for both alloys increased with sliding cycle frequency and temperature, but decreased at higher temperatures due to different wear mechanisms.
Article
Engineering, Mechanical
Yushan Geng, Wenyuan Chen, Jun Cheng, Juanjuan Chen, Shengyu Zhu, Jun Yang, Weimin Liu
Summary: This study controllably deployed an enhanced heterostructure and graded grain distribution in the single FCC-phase HEA model according to the concept of selective solid solution, which contributed to the ultrahigh compressive strength and appreciable plasticity levels. It also effectively inhibited high temperature softening and activated in-situ tribochemistry protection, achieving low wear between room-temperature and 800 degrees C.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Yixuan He, Fan Bu, Yuhao Wu, Jiaqing Sun, Xibo Shao, Long Wang, Haifeng Wang
Summary: This study investigates the microstructures and compounds of Co-B alloys using supercooling treatment, and systematically studies their mechanical and tribological properties. The results show that different intermetallic compounds are formed under different supercooling degrees, and the Co-B alloy containing Co23B6 exhibits the best tribological performance.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Ashok Meghwal, Ameey Anupam, Christiane Schulz, Colin Hall, B. S. Murty, Ravi Sankar Kottada, R. Vijay, P. Munroe, Christopher C. Berndt, Andrew Siao Ming Ang
Summary: High entropy alloys (HEAs) are a new class of materials with excellent mechanical and functional properties. In this study, the AlCoCrFeNi HEA was modified to AlCoCr0.5Ni HEA to improve its oxidation resistance. The AlCoCr0.5Ni HEA coating, fabricated using atmospheric plasma spray (APS) process, exhibited superior wear resistance compared to the AlCoCrFeNi HEA coating at both room temperature and 500 °C. The coating also showed a stronger passive tendency than other coatings and SS316L.
Article
Materials Science, Multidisciplinary
Yuan Fang, Shunqiang Zhao, Chen Li, Yan Wu, Jicheng Li, Hengzhong Fan
Summary: This study investigated the mechanical and tribological properties of (TiNbTaWMo)C high-entropy carbides over a wide temperature range, as well as their oxidation behavior. (TiNbTaWMo)C high-entropy carbides were successfully prepared from five kinds of carbide powders by spark plasma sintering at 2000°C. The results showed that the sintered (TiNbTaWMo)C high-entropy carbides had Vickers hardness of 21.31 GPa, bending strength of 477.15 MPa, and fracture toughness of 6.41 MPa m1/2. At room temperature, the friction coefficient was stable at 0.35, and the wear rate was as low as 3.39 x 10-7 mm3/Nm. The wear mechanisms at different temperatures and the oxidation behavior of (TiNbTaWMo)C at 600°C and 800°C were discussed based on microstructures and phase analysis of the worn surfaces.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xin Guo, Xi Jin, Xiaohui Shi, Huijun Yang, Min Zhang, Junwei Qiao
Summary: The study indicates that boronizing has a significant impact on the tribological behavior of high-entropy alloys, leading to increased hardness, reduced wear rates, and a change in wear mechanisms.
Article
Green & Sustainable Science & Technology
Carlton J. Reeves, Ashish K. Kasar, Pradeep L. Menezes
Summary: Environmentally friendly lubricants, including room-temperature ionic liquids (RTIL), are becoming popular due to their potential to replace toxic petroleum-based oils, although their thermal stability remains a concern. RTILs show promising tribological properties and enhanced thermal stability compared to bio-based and petroleum-based oils, attributed to their lamellar-like liquid crystal structure, electrostatic potential dipolar, and molecular adsorption layer.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Materials Science, Coatings & Films
Biao Huang, Qiong Zhou, Qi An, Er-geng Zhang, Qiang Chen, Dan-dan Liang, Hao-ming Du, Zheng-mei Li
Summary: The TiAlSiN coating exhibited excellent mechanical properties in the ball on disc tribological test under different friction pairs and loads. The wear mechanisms varied with different materials of friction pairs, and a lubrication film can be formed in a humid environment to improve the tribological properties of the coating.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Chaojie Liang, Chenglei Wang, Kexiang Zhang, Hong Tan, Mulin Liang, Yingguang Xie, Weijie Liu, Jijie Yang, Shengfeng Zhou
Summary: In this study, we successfully prepared high-entropy alloys (HEAs) with good comprehensive properties using vacuum arc melting technology. The influence of Mo content on the microstructure, mechanical properties, and tribological properties of the HEAs was systematically studied. The results showed that the Mo1.0 HEA exhibited the best mechanical properties, while all HEAs showed excellent friction and wear properties.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Deepak Kumar
Summary: Wear and friction are inevitable failures in mechanical systems with moving components， and the development of new materials such as high entropy alloys (HEAs) offers promising solutions. HEAs provide exceptional wear resistance, reduced friction, thermal stability, hardness, corrosion resistance, and mechanical strength, making them highly desired for tribological applications. This review focuses on various aspects of HEAs tribology and proposes future recommendations for the advancement of HEAs manufacturing and their diverse tribological applications.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Qing Zhao, Xi Jin, Xiao Hui Shi, Hui Jun Yang, Min Zhang, Junwei Qiao
Summary: The tribological behavior of TiZrHfNbTa refractory high-entropy alloy (RHEA) sliding against Si3N4 ball was investigated in various conditions. The results showed that the wear rate varied depending on the environment and temperature. The wear mechanisms shifted from abrasive wear to adhesive wear and eventually oxidation wear at high temperature.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Haozhe Li, Xiaolin Li, Chi Jin, Qian Li, Qiang Ma, Ke Hua, Haifeng Wang, Weimin Liu
Summary: The tribological behavior of AlCr0.5NbTaxTi4-x ( x = 0, 0.5, and 1) refractory high-entropy alloys was systematically investigated. The addition of Ta enhanced solid solution strengthening and increased the melting point, resulting in improved high-temperature strength and reduced coefficients of friction and wear rates at elevated temperatures. The excellent wear resistance at high temperatures can be attributed to the formation of an oxide-tribo layer with ultrafine-grained layers and good high-temperature mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
S. J. Tsianikas, Y. Chen, Z. Xie
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Yujie Chen, Xianghai An, Zhifeng Zhou, Paul Munroe, Sam Zhang, Xiaozhou Liao, Zonghan Xie
Summary: The research found that the yield strength of nanostructured alloys is size-independent, but the deformation behavior is significantly influenced by the sample size. With decreasing sample size, the deformation mode transitions from highly localized shear to apparently homogeneous deformation.
SCIENCE CHINA-MATERIALS
(2021)
Article
Multidisciplinary Sciences
Jiang Xu, Zhijian Pan, Shaung Peng, Yanjie Zhao, Shuyun Jiang, Yu jie Chen, Zong-Han Xie, Paul Munroe
Summary: A ceramic-based coating with a hierarchical surface structure was synthesized using a double cathode glow discharge technique, exhibiting superhydrophobicity and strong adhesion to water. This coating shows highly efficient antibacterial ability against various bacteria, attributed to the synergistic effects of Cu ion release and photothermal activity.
Article
Materials Science, Multidisciplinary
Yujie Chen, Dengke Chen, Xianghai An, Yin Zhang, Zhifeng Zhou, Song Lu, Paul Munroe, Sam Zhang, Xiaozhou Liao, Ting Zhu, Zonghan Xie
Summary: The emergence of multi-principal element alloys (MPEAs) brings great promise for high performance metallic materials. This study reports a new deformation mechanism of mechanically-induced dual phase transformations in the CrCoNi medium-entropy alloy, showing the potential for enhancing the mechanical properties of advanced alloys.
Article
Chemistry, Multidisciplinary
Ade Kismarahardja, Zhanxin Wang, Dongwei Li, Lihua Wang, Libo Fu, Yujie Chen, Zhanxi Fan, Ye Chen, Xiaodong Han, Hua Zhang, Xiaozhou Liao
Summary: The deformation mechanism of gold nanoribbons with unconventional hexagonal structures is investigated using atomic-resolution in situ tensile-straining transmission electron microscopy. The results reveal that plastic deformation involves three stages and includes both full and partial dislocation activities.
Article
Chemistry, Physical
Yiman Zhao, Xiaomin Zhang, Hui Quan, Yujie Chen, Shu Wang, Sam Zhang
Summary: The addition of Mo in FeCoNiCrMnMox HEA films leads to the formation of a denser film with refined grain size, promoting the transformation from a FCC phase to a mixture of FCC and BCC phases. This results in increased hardness and decreased friction coefficient, enhancing the damage tolerance of the films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yiman Zhao, Shunian Chen, Yujie Chen, Shuai Wu, Wenling Xie, Weiqing Yan, Shu Wang, Bin Liao, Sam Zhang
Summary: The study found that higher N2 gas flow rates promote higher N content in the coatings, resulting in a transformation to a face-centered-cubic (FCC) phase; the high N content allows the coating to exhibit superior hardness and excellent wear and corrosion resistance properties.
Article
Materials Science, Multidisciplinary
S. J. Tsianikas, Y. Chen, J. Jeong, S. Zhang, Z. Xie
Summary: A high entropy steel (Fe(72.4)Co(13.9)Cr(10.4)Mn(2.7)B(0.)(34)) was prepared by magnetron sputtering. The alloy exhibited high yield strength and appreciable plasticity, with a unique composition distribution at the nanometer scale. The alloy's impressive strength-ductility combination is attributed to multiple distinctive strengthening mechanisms, making it a potential candidate for safety-critical, load-bearing structural applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Jing Xu, Yanjie Zhao, Yuhao Chen, Yujie Chen, Zong-Han Xie, Paul R. Munroe
Summary: The study fabricated a composite coating with multiple antibacterial modes, showing highly efficient bactericidal effect against Escherichia coli and Staphylococcus aureus, and could be a promising candidate to combat medical device-associated infections.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Simon Tsianikas, Yujie Chen, Ashley Slattery, Jonathan Peters, Zonghan Xie
Summary: The body-centred cubic high entropy steel demonstrates controlled attenuation of its chemical complexity with deformation by reducing both the spinodal structure and short-range chemical fluctuations. This reduction in local strain enables more uniform, steady deformation, leading to extended ductility while maintaining ultrahigh strength. The interactions between dislocations and concentration waves are identified as responsible for the compelling effect on the newly created steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Qianwei Huang, Jiyuan Yang, Zibin Chen, Yujie Chen, Matthew J. Cabral, Haosu Luo, Fei Li, Shujun Zhang, Yulan Li, Zonghan Xie, Houbing Huang, Yiu-Wing Mai, Simon P. Ringer, Shi Liu, Xiaozhou Liao
Summary: This study demonstrates the feasibility of generating CDWs through mechanical stress and investigates the formation mechanism through experiments and simulations.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Yujie Chen, Xianghai An, Zhifeng Zhou, Jisheng Ma, Paul Munroe, Sam Zhang, Zonghan Xie
Summary: The study discusses the preparation of a novel medium-entropy nitride using magnetron sputtering, which exhibits excellent hardness, fracture toughness, and damage tolerance. The unique microstructure and mechanisms of the new nitride open up a new frontier for the development of damage-tolerant MPENs for application under extreme loading conditions.
Article
Materials Science, Multidisciplinary
Yujie Chen, Xianghai An, Sam Zhang, Feng Fang, Wenyi Huo, Paul Munroe, Zonghan Xie
Summary: This study investigated the effect of lamellar orientation on the deformation behavior of eutectic high entropy alloy at the micrometer scale, revealing the different plasticity behaviors of two laminate orientations. The findings enhance understanding of the mechanical size effect in small-scale crystalline materials, providing a critical dimension for the development of high-performing materials used for nano- or micro-electromechanical systems.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Simon Tsianikas, Yujie Chen, Jiwon Jeong, Siyuan Zhang, Zonghan Xie
Summary: The newly developed iHEA alloy, with a BCC structure, achieves high strength and remarkable ductility through multiple deformation pathways; the phase transitions and nano-laminates enhance plasticity.
