Review
Materials Science, Multidisciplinary
Dawei Luo, Qing Zhou, Zhuobin Huang, Yulong Li, Yulin Liu, Qikang Li, Yixuan He, Haifeng Wang
Summary: This paper reviews the properties and development status of high entropy alloy (HEA) coating systems for tribological applications and summarizes the correlation between coating composition, mechanical properties, and friction and wear characteristics.
Article
Materials Science, Coatings & Films
Xu Yu, Junjun Wang, Linqing Wang, Weijiu Huang
Summary: CrNbSiTiZr high-entropy alloy films were fabricated on different substrates with varying bias voltages, showing amorphous structure and high hardness. The film deposited at -50V bias exhibited high residual compressive stress, while wear mechanism shifted from adhesive to abrasive with increasing negative bias. Superior electrochemical corrosion resistance was observed for all films, with the film at -50V bias showing the best performance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Weijie Zheng, Shulin Lu, Shusen Wu, Xiaohua Chen, Wei Guo
Summary: Due to their solid solution structure, high-entropy alloys exhibit high strength and resistance to softening at both high and ambient temperatures. However, their high density and low plasticity at ambient temperature limit their widespread applications. This study investigated the microstructure and mechanical properties of MoNbVTx HEA with different Ta contents and found that certain alloys exhibited superior high temperature performance and relatively low density, making them potential materials for structural applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
Ching-Yin Lee, Peng-Hsi Chen, Su-Jien Lin, Jien-Wei Yeh
Summary: By adjusting the composition, we have designed a new type of high-entropy alloy (AlCrNbSiTi) target and fabricated corresponding films using the HiPIMS technique. The films demonstrate excellent mechanical properties and cutting performance, showing potential for various applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Tianxin Li, Shudao Wang, Wenxue Fan, Yiping Lu, Tongmin Wang, Tingju Li, Peter K. Liaw
Summary: TiZrHfNbTa refractory high-entropy alloys (RHEAs) exhibit poor phase stability at intermediate temperatures. By calculating phase diagrams, a Ta-free and Hf-depleted Ti30Zr30Hf16Nb24 RHEA with outstanding phase stability was designed. The cold-rolled plus recrystallization-annealed (CR+A) Ti30Zr30Hf16Nb24 RHEA contained (Ti, Zr)-rich nano-precipitates controlled by the spinodal decomposition mechanism, which contributed to its superior strength-ductility combination.
Article
Materials Science, Multidisciplinary
Zhiping Sun, Xiaoyu Zhang, Xiaozhen Li, Zhaomin Xu, Cheng Li, Zhiming Wang
Summary: This study analyzed the microstructure and wear behavior at high temperature of CoCrFeNiAl1.0 high-entropy alloys. The alloy structure consists of equiaxed grains, including bcc phase and a small amount of fcc phase. The friction coefficient of the alloy gradually decreased with increasing temperature, and the wear rate showed a trend of initially increasing and then decreasing. Oxidation aggravated the wear of the alloy at lower temperatures, but increased the wear resistance of the alloy when the temperature exceeded 400°C due to densification and ceramization of the oxide layer.
Article
Materials Science, Multidisciplinary
Armin Asghari Alamdari, Mahshid Hashemkhani, Saman Hendessi, Pinar Tatar Guner, Havva Yagci Acar, Ibrahim Halil Kavakli, Ugur Unal, Amir Motallebzadeh
Summary: The study developed and evaluated antibacterial and biocompatible refractory high-entropy alloy (RHEAs) films using RF magnetron sputtering technique. The results showed that the Ag nanoparticle doped RHEA film exhibited strong antibacterial activity and promising biocompatibility.
Article
Engineering, Manufacturing
Yansong Zhang, Huaming Wang, Yanyan Zhu, Shuquan Zhang, Fang Cheng, Junwei Yang, Bing Su, Chen Yang
Summary: Lightweight refractory high-entropy alloys (LRHEAs) have lower density and better ductility compared to other refractory high-entropy alloys. Laser directed energy deposition additive manufacturing (LDED) technology is an ideal process for preparing LRHEAs. This study investigated the microstructure evolution and the plastic deformation mechanisms of a new LRHEA Al0.3NbTi3VZr1.5 fabricated by LDED.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Coatings & Films
Ching-Yin Lee, Su-Jien Lin, Jien-Wei Yeh
Summary: A hybrid physical vapor deposition coating system equipped with high-power impulse magnetron sputtering (HiPIMS) and cathode arc deposition (CAD) systems was designed in this study. Using this technique, (AlCrNbSiTi)N/TiN multilayer films consisting of alternating layers of (AlCrNbSiTi)N, a high-entropy alloy nitride (HEAN) with enhanced thermal stability, and TiN, a material known for its high hardness, were fabricated. A new nucleation and growth model was proposed to explain the thin film deposition phenomenon in this hybrid coating system. The effects of the modulation period on the microstructural, mechanical, and oxidation resistance properties of the coatings were investigated. The 64-layer coating exhibited outstanding mechanical, oxidation resistance, and tribological properties compared with those of previously reported multilayer coatings.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yuankui Cao, Weidong Zhang, Bin Liu, Yong Liu, Meng Du, Ao Fu
Summary: The study shows that thermomechanical processing can lead to phase decomposition in refractory high entropy alloys, affecting both room temperature and high temperature mechanical properties; the impact of precipitates on room temperature strength depends on the competition between precipitation strengthening and solid solution strengthening.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Shih-Yung Tsai, Yi-An Chen, Jhen-De You, Jinn P. Chu, Pakman Yiu
Summary: High entropy alloy (HEA) thin films were successfully fabricated using RF magnetron co-sputtering, and the addition of titanium in the IT6 sample resulted in the lowest specific wear rate (K0). This indicates that IT6 may have a longer service life if used in MEMS moving parts.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ping-Hsu Ko, Ya-Jing Lee, Shou-Yi Chang
Summary: This study investigates the effect of boron addition on the properties of high-entropy alloys. The results show that the addition of boron induces the precipitation of a hard phase at the grain boundaries, increasing the hardness. Moreover, the boron addition decreases the anisotropy of the alloy, leading to improved work hardenability and ductility.
Article
Materials Science, Multidisciplinary
Peng Zhu, Yao Yu, Cheng Zhang, Qingjun Zhou, Bailing An, Rong Guo, K. C. Chan, Lin Liu
Summary: A V0.5Nb0.5ZrTi refractory high-entropy alloy was successfully fabricated by selective laser melting (SLM) using elemental powders. A crack-free SLMed sample with a nearly single BCC structure was obtained with a VED of 333 J/mm3. Microcracks were generated in the SLMed samples when the VED was lower or higher than 333 J/mm3. Cracks were formed due to incomplete melting of Zr particles and thermal stress induced by the large temperature gradient during the SLM process. The SLMed crack-free sample exhibited superior mechanical properties compared to the as-cast counterpart.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Chemistry, Physical
Fanyong Zhang, Honglu Ma, Ruibin Zhao, Guangxing Yu, Jiawen Chen, Fuxing Yin
Summary: High-entropy alloy nitride films were deposited on 304 steel and silicon plates using reactive DC magnetron sputtering. The addition of nitrogen transformed the film structure and improved the hardness and corrosion resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Le Zong, Liujie Xu, Chunyang Luo, Zhou Li, Yunchao Zhao, Zhaoning Xu, Chenhui Zhu, Shizhong Wei
Summary: WMoNbTaV-1ZrO(2) refractory high-entropy alloy was successfully prepared by adding m-ZrO2 particles, which significantly increased the strength and plasticity of the alloy. The high strength was mainly due to the inherent strength in the alloy and grain boundary strengthening caused by the addition of m-ZrO2 particles.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Dongpeng Hua, Wan Wang, Dawei Luo, Qing Zhou, Shuo Li, Junqin Shi, Maosen Fu, Haifeng Wang
Summary: In this study, the nano-scratch performance of amorphous/amorphous nano-laminates was evaluated using molecular dynamics simulation. The results showed that the layer thickness has a significant size effect on the tribological properties, and the interface has an obstruction effect on shear deformation. The contact environment of the indenter bottom plays an important role in the normal force.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Qian Jia, Qing Zhou, Yue Ren, Yin Du, Xiaoxing Zhao, Xian-Zong Wang, Haifeng Wang, Ben D. Beake, Feng Zhou
Summary: Ti45Zr16Cu10Ni9Be20 bulk metallic glass with deep cryogenic-cycling treatment (DCT) exhibited increased wear resistance at the cost of decreased hardness in macroscopic wear tests. The wear mechanism shifted from severe fatigue wear to mild ductile ploughing, while oxidation wear played a minor role. The competition between lower hardness and higher elastic recovery resulted in a lower friction coefficient, indicating the potential of DCT in designing wear-resistant BMGs.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Mechanical
Vipul Bhardwaj, Qing Zhou, Fan Zhang, Weichao Han, Yin Du, Ke Hua, Haifeng Wang
Summary: A series of AlxTiZrNbHf refractory high entropy alloys (RHEAs) were prepared to investigate their mechanical and wear properties. It was found that the addition of Al improved the mechanical and wear resistance properties by causing lattice distortion and second phase strengthening in the alloys. The study highlighted significant alterations in microstructure, mechanical properties, and wear resistance with the inclusion of Al, which is beneficial for designing alloys for wear applications.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Qi Yan, Biao Chen, Wenting Ye, Jie Wan, Tao Zhang, Hongchao Kou, Qin Zhou, Wenfeng Lu, Hao Wang, Jianghua Shen, Haifeng Wang, Jinshan Li
Summary: The lubricant effect of graphene in metals during friction and wear is difficult to achieve. This study improved the interface of composites by decorating few-layered graphene with SiC nanoparticles, resulting in significantly enhanced antiwear performance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Yixuan He, Xudong Liu, Chenxu Xing, Zhangchi Bian, Qing Zhou, Jun Wang, Haifeng Wang, Jinshan Li
Summary: This study investigates the effects of aging time on the mechanical properties and microstructure evolution of GH 605 superalloy. It is found that aging treatment can enhance the yield strength and tensile ductility of the alloy. The strengthening mechanism is attributed to carbide precipitation and grain refinement.
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xian-Zong Wang, Yanfei Wang, Zhuobin Huang, Qing Zhou, Haifeng Wang
Summary: Understanding the tribocorrosion behavior of metals, especially the recently emerging medium entropy alloys (MEAs), is critical for their possible application in seawater. In this study, the tribocorrosion behavior of CoCrNi MEA was investigated and the features of wear, adhesive wear, delamination, and plastic deformation at different potentials were characterized.
Article
Materials Science, Multidisciplinary
Dongpeng Hua, Xiaorong Liu, Wan Wang, Qing Zhou, Qiaosheng Xia, Shuo Li, Junqin Shi, Haifeng Wang
Summary: In this study, the atomistic formation mechanism of the three-dimensional hierarchical twins in CoCrNi was investigated using molecular dynamics simulations. The effects of strain rate and deformation temperature were found to be important factors. Chemical inhomogeneity in CoCrNi can reduce the necessary kink height for conjugate twins, promoting the formation of twin networks. At room temperature, plastic deformation is dominated by primary twins and conjugate slips at a relatively lower strain rate. Higher strain rates activate hierarchical twins. At cryogenic temperatures, hierarchical twins are promoted within a large range of strain rates. The study provides insights into the twinning behavior and offers guidance for designing alloys with excellent mechanical performance by tuning microstructures.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Zhuobin Huang, Yue Ren, Dawei Luo, Qing Zhou, Yixuan He, Haifeng Wang
Summary: Medium-entropy alloys (MEAs) exhibit excellent mechanical properties and unique deformation mechanism at cryogenic temperatures. This study reports a heterogeneous CoCrNi MEA with favorable combination of strength and ductility at lower temperatures, which leads to improved wear resistance. The wear mechanism shows a transition from brittle fracture to mild plastic deformation as temperature decreases.
Review
Materials Science, Multidisciplinary
Dawei Luo, Qing Zhou, Zhuobin Huang, Yulong Li, Yulin Liu, Qikang Li, Yixuan He, Haifeng Wang
Summary: This paper reviews the properties and development status of high entropy alloy (HEA) coating systems for tribological applications and summarizes the correlation between coating composition, mechanical properties, and friction and wear characteristics.
Article
Materials Science, Multidisciplinary
Yue Ren, Tingyi Yan, Zhuobin Huang, Qing Zhou, Ke Hua, Xiaolin Li, Yin Du, Qian Jia, Long Zhang, Haifeng Zhang, Haifeng Wang
Summary: This study demonstrates an improvement in wear resistance for a Ti-based bulk metallic glass composite at cryogenic temperatures. The wear resistance improvement is associated with the suppressed martensitic transformation and increased strength, making the material an excellent candidate for cryogenic wear applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Xinyi Liu, Xuhui Pei, Yin Du, Qing Zhou, Haifeng Wang
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Multidisciplinary
Yue Ren, Zhuobin Huang, Yucheng Wang, Qing Zhou, Tao Yang, Qikang Li, Qian Jia, Haifeng Wang
Summary: The (CoCrNi)88Mo12 dual-phase MEA is fabricated to enhance the matrix and achieve excellent cryogenic wear performance. The study reveals that a significant wear reduction of 73% is achieved as the temperature decreases from 233 K to 113 K, and the friction-induced amorphous layer underneath the worn surface plays a crucial role in the excellent wear behavior at 113 K. The low stacking fault energy of the CoCrNi-rich matrix at cryogenic temperature and the high solute concentration of Mo contribute to the rapid amorphization process.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Tian-tian Lu, Dong-peng Hua, Bai-Ling An, Muhammad Arslan Hafeez, Jie Pan, Li-Xue Chen, Jun-Yong Lu, Qing Zhou, Cheng Zhang, Lin Liu
Summary: In this study, a novel approach to enhance the anti-adhesive wear performance of rail in electromagnetic launching system is proposed by magnetron sputtering a W thin film onto the Al alloy surface. The results show that this approach can significantly reduce the interfacial energy of the rail/armature pair, leading to lower friction coefficient and alleviation in adhesion and mechanical damage of the Cu alloy. Molecular dynamics simulations reveal the formation of an amorphous interfacial layer during friction, which enables low friction by facilitating countermotion at the contacting surfaces.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Yeran Shi, Wenting Ye, Dongpeng Hua, Qing Zhou, Zhuobin Huang, Yuxin Liu, Shuo Li, Ting Guo, Yongnan Chen, Stefan J. Eder, Haifeng Wang
Summary: This article reports a groundbreaking study on CoCrFeMnNi/Gr nanocomposites, highlighting their exceptional mechanical properties. The authors use molecular dynamics simulations to reveal the profound impact of graphene on the nucleation and propagation of dislocations in HEAs. They demonstrate that the high stresses at the interface between HEA and graphene lead to out-of-plane deformation of graphene, accommodating the plasticity of HEA. The authors also establish a relationship between the mechanical properties of the nanocomposites and the tensile direction and thickness of HEA. These findings are crucial for the design of advanced materials with unprecedented strength and ductility.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Chen Yang, Cunhong Yin, Yuzhong Wu, Qing Zhou, Xixia Liu
Summary: This study investigates the evolution of pearlite into an amorphous wrapped nanolamellar heterostructure (AWNH) and its effect on the self-lubrication behavior. Experimental characterizations and molecular dynamics simulations show that AWNH acts as a supporting layer and exhibits low friction and good wear resistance due to its high hardness, high plasticity, and outstanding interface deformation coordination ability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)