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Effect of Co on phase stability and mechanical behavior of CoxCrFeNiMnAl0.3 high entropy alloys with micro/nano hierarchical structure

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MATERIALS & DESIGN 2022年 215卷

作者： Zhang, Guannan Yang, Xiao Qi, Wu Li, Yong Wang, Wei Chen, Yixiang Li, Jiangtao Li, Laifeng Chinese Acad Sci Tech Inst Phys & Chem Key Lab Cryogen Beijing 100190 Peoples R China Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China Univ Sci & Technol Beijing Sch Mech Engn Beijing 100083 Peoples R China Songshan Lake Mat Lab Dongguan 523808 Guangdong Peoples R China

Co-Cr-Fe-Ni-Mn high entropy alloys (HEAs) have attracted extensive attention due to their broad cryogenic engineering application potential, reasonable control of alloying elements can significantly improve its mechanical performance. In this work, the effects of Co content on the phase stability and mechanical behavior CoxCrFeNiMnAl0.3 HEAs were investigated. It is found that with the decrease of the Co content, the stability of the face-centered cubic (FCC) solid solution phase in the alloy decreases, resulting in the precipitation of the BCC (body-centered cubic) phase from the FCC phase, thereby obtaining the FCC + BCC dual-phase structure. During annealing, the precipitated BCC phase can effectively suppress the grain growth and recrystallization of the FCC solid solution, forming an ultrafine-grained microstructure. In addition, the Ni-Al type nano-B2 phase can form in the BCC phase under the influence of the negative formation enthalpy during solidification. This micro/nano hierarchical structure can effectively improve the mechanical properties of the alloys. Co0.25CrFeNiMnAl0.3 maintains relatively excellent tensile yield strength (486 MPa), the tensile elongation remains above 20 %. This study regulates the formation of the BCC phase and B2 phase by reducing the content of Co, which provides a new idea for the preparation of low-cost HEAs with excellent mechanical properties. (C) 2022 The Authors. Published by Elsevier Ltd.

关键词： High-entropy alloys CoxCrFeNiMnAl0.3 Phase stability micro/nano hierarchical structure Mechanical behavior

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Construction of Zn-incorporated micro/nano hierarchical structure Coatings on Tantalum

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Journal of Bionic Engineering 2020年第6期17卷 1186-1195页

作者： Yongjie Wei Yang Hu Mingrui Li Dongdong Li Key Laboratory of Automobile Materials of MOE Department of Materials Science and EngineeringJilin UniversityChangchun 130012China

Tantalum(Ta)alloys have been widely used as bone repair materials duc to their excellent *** present work,zinc(Zn)incorporated ceramic coatings with micro/nano hierarchical structure were successfully fabricated on Ta by micro-arc oxidation and hydrothermal *** content of Zn ions is about(1.35士0.3)wt%.Cortex-like rough morphology(Ra:1.504μm)with irregular vermiform slots can be clearly observed on the surface of *** importantly,the coatings resembling the structure of natural bone can release Zn,Ca,and P ions in a controlled and sustained *** corrosion resistance ofTa is greatly improved after functionalized with ceramic coatings,confirming by potentiodynamic polarization *** bonding strength between the coatings and substrates can be up to 18.9 ***,the surface of MAOs-HT@Ta is covered by bonelike apatite after immersed in Simulated Body Fluid(SBF)for three weeks,showing excellently *** results suggest that the innovative Zn-incorporated micro/nano hierarchical coatings on Ta may be used as promising candidates for orthopedic implants.

关键词： micro-arc oxidation micro/nano hierarchical structure bioactivity coatings corrosion resistance

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Continuous spheroidization strategy for explosives with micro/nano hierarchical structure by coupling microfluidics and spray drying

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CHEMICAL ENGINEERING JOURNAL 2021年 412卷

作者： Shi, Jinyu Zhu, Peng Zhao, Shuangfei Xu, Cong Yan, Fanyuhui Shen, Ruiqi Xia, Huanming Jiang, Hanyu Xu, Siyu Zhao, Fengqi Nanjing Univ Sci & Technol Sch Chem Engn Nanjing 210094 Peoples R China Nanjing Univ Sci & Technol Sch Mech Engn Nanjing 210094 Peoples R China Xian Modern Chem Res Inst Sci & Technol Combust & Explos Lab Xian 710065 Shaanxi Peoples R China

The spheroidization of explosives with micro/nano hierarchical structure is a feasible and efficient way to meet the requirements of energy and safety. In order to achieve the expectation, a microfluidic strategy consisting of a spheroidization model and verification experiments was proposed. The model states a possible spheroidization process and three spheroidization types by theoretical analysis. Furthermore, a continuous microfluidic platform was established for the verification experiments, which is consisting of a combinatorial microfluidic module and a spray-drying module. Here we used HNS (2,2',4,4',6,6'hexanitrostilbene) to verify the applicability of the strategy. The spheroidization process was verified by deconstructing HNS microspheres and adjusting the internal-outside pressure at the microscale. The spheroidization types were verified by tuning flow rate ratios of the solvent and antisolvent. It was found that the model is quite applicable for the spheroidization of micro/nano hierarchical structure by microfluidics. According to the detonation test, it was found the HNS microspheres have similar firing sensitivity to nano HNS under short-pulse shock wave, which means the better fluidity and higher bulk density can be realized while retaining the firing sensitivity. This study demonstrates an efficient, safe strategy to realize the high-quality spheroidization and continuous preparation of explosives with micro/nano hierarchical structure.

关键词： microfluidics Spheroidization micro/nano hierarchical structure Continuous preparation Hexanitrostilbene

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micro-amplitude vibration-assisted scratching:a new method for one step and controllable fabrication of the microscale V-groove and nanoscale ripples

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International Journal of Extreme Manufacturing 2025年第3期7卷 398-421页

作者： Haoxiang Wu Hu Huang Zhiyu Zhang Jiwang Yan Key Laboratory of CNC Equipment Reliability Ministry of EducationSchool of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130022People’s Republic of China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033People’s Republic of China Department of Mechanical Engineering Faculty of Science and TechnologyKeio UniversityYokohama 223-8522Japan

micro/nano hierarchical structures could endow materials with various surface ***,the multilayer and multiscale characteristics of micro/nano hierarchical structures bring difficulties for their one step and controllable ***,based on tip-based fabrication techniques,this study proposed a micro-amplitude vibration-assisted scratching method by introducing a periodic backward displacement into the conventional scratching process,which enabled the synchronous creation of the microscale V-groove and nanoscale ripples,i.e.a typical micro/nano hierarchical *** experiments and finite element modeling were employed to explore the formation process and mechanism of the micro/nano hierarchical *** different from conventional cutting,this method was mainly based on the plow mechanism,and it could accurately replicate the shape of the indenter on the material *** microscale V-groove was formed due to the scratching action,and the nanoscale ripple was formed due to the extrusion action of the indenter on the microscale V-groove’s ***,the relationships between the processing parameters and the dimensions of the micro/nano hierarchical structures were established through experiments,and optimized processing parameters were determined to achieve regular micro/nano hierarchical *** this method,complex patterns constructed by various micro/nano hierarchical structures were fabricated on both flat and curved surfaces,achieving diverse surface structural colors.

关键词： vibration-assisted scratching tip-based micro/nano fabrication micro/nano hierarchical structure structural color

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Osteo-angiogenic activity of a micro/nano hierarchical SrSi-codoped hydroxyapatite coating on zirconium alloy

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JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 2024年 30卷 6924-6940页

作者： Xu, Xiaoning Wang, Kaige Tan, Xinrong Zhang, Ligang Liu, Libin Cent South Univ Sch Mat Sci & Engn Changsha Peoples R China Hunan Univ Sci & Technol Sch Mat Sci & Engn Xiangtan Peoples R China Cent South Univ State Key Lab Powder Met Changsha Peoples R China

Numerous studies highlight the significance of biomimetic metallic implant surfaces for enhancing osseointegration through synergistic regulation of osteogenesis-angiogenesis. However, achieving clinical demands through singular structural or compositional biomimicry poses challenges. Therefore, the integration of both structural and compositional biomimicry, to closely emulate the host bone surface, is crucial for maximizing the biological activity of metallic implants. We synthesized a micro/nano hierarchical SrSi-codoped hydroxyapatite coating on Zr16Nb12Ti alloy through a simple microarc oxidation-hydrothermal reaction. Results revealed that Si doping enhances hydroxyapatite (HA) growth along the c-axis, forming large-sized nanorods. However, codoping of Sr and Si inhibits grain growth by reducing crystal growth freedom, yielding a finer HA nanowire coating (MH-SrSi). MH-SrSi exhibits outstanding hydrophilicity attributed to the finer HA nanowires on the coating surface, promoting the adhesion of proteins and cells. Additionally, the released Sr and Si from MH-SrSi stimulate the secretion of osteogenesis-related proteins in osteoblasts and angiogenesis-related factors in endothelial cells, exhibiting a synergistic effect on promoting osteogenesis and angiogenesis. In vivo evaluation mirrors these results and shows that the micro/nano hierarchical structures of MH-SrSi elicited inward bone growth. Overall, MH-SrSi, combining structural biomimicry and compositional biomimicry, exhibits excellent osseointegration capability, making it a promising candidate for implant materials.

关键词： Bone implant material micro/nano hierarchical structure Hydroxyapatite Bioactive elements Synergistic effect Osteo-angiogenic activity

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Femtosecond laser processed superhydrophobic surface

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JOURNAL OF MANUFACTURING PROCESSES 2024年 109卷 250-287页

作者： Guo, Yu Zhao, Haibin Shandong Univ Sch Mat Sci & Engn Key Lab Liquid Solid Struct Evolut & Proc Mat Minist Educ Jinan 250061 Shandong Peoples R China Shandong Univ Sch Mat Sci & Engn Jinan Shandong Peoples R China

Femtosecond laser has offered a precise, controllable, and environmentally friendly solution for manufacturing superhydrophobic surfaces adorned with micro and nanostructures. It has shown great application value in selfcleaning, anti-icing, drag reduction, droplet manipulation, water/fog harvesting, corrosion resistance, wear resistance, oil-water separation, and antibacterial functionality. In light of these advancements, this paper aims to provide a comprehensive review and insightful discussion regarding the development of fs laser-processed superhydrophobic surfaces, encompassing surface microstructure and chemistry states. In terms of microstructure, the review explores remarkable superhydrophobic properties associated with LIPSS, microgroove hierarchical structures, microcolumn/microcone hierarchical structures, micro pits/holes hierarchical structures, and other random nanostructures. These distinctive surface architectures have illustrated notable capabilities in achieving superhydrophobicity. Furthermore, the analysis delves into the realm of surface chemical states, offering detailed insights into the utilization of fs laser technology as a means to attain surface superhydrophobic functionality. Alongside this, the paper presents a comprehensive summary of research progress pertaining to the efficient replication of polymer superhydrophobic surfaces embedded with micro and nanostructures. This review will facilitate enhanced comprehension and foster a deeper appreciation of the interplay between fs laser processing technology and wettability.

关键词： Femtosecond laser Superhydrophobic micro/nano hierarchical structure Surface chemical state Wettability

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Electrohydrodynamic behavior of water droplets on a horizontal super hydrophobic surface and its self-cleaning application

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APPLIED SURFACE SCIENCE 2017年 403卷 133-140页

作者： Li, Jian Wei, Yuan Huang, Zhengyong Wang, Feipeng Yan, Xinzhu Wu, Zhuolin Chongqing Univ State Key Lab Power Transmiss Equipment & Syst Se Chongqing 400044 Peoples R China

Moisture is a significant factor that affects the insulation performance of outdoor high-voltage insulators in power systems. Accumulation of water droplets on insulators causes severe problems such as flashover of insulators and power outage. In this study, we develop a method to fabricate a micro/nano hierarchical super hydrophobic surface. The as-prepared super hydrophobic surface exhibits a water contact angle (WCA) of 160.4 +/- 2 degrees, slide angle (SA) less than 1 degrees and surface free energy (SFE) of 5.99 mJ/m(2). We investigated the electrohydropdynamic behavior of water droplet on a horizontal super hydrophobic surface compared with hydrophobic RTV silicone rubber surface which was widely used as anti-pollution coating or shed material of composite insulator. Results show that water droplet tended to a self-propelled motion on the super hydrophobic surface while it tended to elongate and break up on the RTV surface. The micro/nano hierarchical surface structure and chemical components with low surface free energy of the super hydrophobic surface jointly contributed to the reduction of skin fraction drag and subsequently made it possible for the motion of water droplet driven by electric field. Furthermore, the self-propelled motion of water droplets could also sweep away contaminations along its moving trace, which provides super hydrophobic surface a promising anti-pollution prospect in power systems. (C) 2017 Elsevier B.V. All rights reserved.

关键词： micro/nano hierarchical structure Superhydrophobicity RTV silicone rubber Electrohydrodynamic behavior of water droplets Self-cleaning

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micro/nano hierarchical poly(acrylic acid)-grafted-poly(vinylidene fluoride) layer coated foam membrane for temperature-controlled separation of heavy oil/water

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SEPARATION AND PURIFICATION TECHNOLOGY 2015年 156卷 207-214页

作者： Zhang, Wenbin Zhang, Feng Gao, Shoujian Zhu, Yuzhang Li, Jingye Jin, Jian Chinese Acad Sci Suzhou Inst Nanotech & Nanobion Nanobion Div & I Lab Suzhou 215123 Peoples R China Chinese Acad Sci Shanghai Inst Appl Phys Shanghai 201800 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Heavy crude oil/water separation is becoming a worldwide issue and a tougher challenging as compared to light crude oil due to its high viscosity. Herein, we report a facile approach for high-efficient heavy oil/water separation by combing superwetting membrane filtration with elevated temperature during separation process. micro/nano hierarchical PAA-g-PVDF layer coated nickel foam membranes are successfully fabricated through a salt-induced phase inversion process. The PAA-g-PVDF coating layer endows the foam membrane a superhydrophilic and underwater superoleophobic property, and a low heavy-oil-adhesion force. At an elevated temperature (up to 85 degrees C) where the viscosity of heavy oil is dramatically decreased with the increase of temperature, the foam membranes are applicable for temperature-controlled separation of heavy oil/water mixture with various heavy oil/water volume ratio with high separation efficiency (the contents of heavy oil in the filtrate after one-time separation <20 ppm) and high flux up to similar to 10(4) L m(-2) h(-1), solely driven by gravity. Most importantly, the foam membrane exhibits an excellent anti-heavy-oil-fouling property and is easily recycled for long-term use. The high separation performance with elevated temperature, combined with easy scale up, makes the foam membranes an attractive option for treating heavy oil containing wastewater. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Superhydrophilic and underwater superoleophobic Heavy oil/water separation Superwetting membrane micro/nano hierarchical structure PVDF membrane

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Mesenchymal stem cell growth behavior on micro/nano hierarchical surfaces of titanium substrates

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COLLOIDS AND SURFACES B-BIOINTERFACES 2015年 127卷 221-232页

作者： Shen, Xinkun Ma, Pingping Hu, Yan Xu, Gaoqiang Zhou, Jun Cai, Kaiyong Chongqing Univ Coll Bioengn Key Lab Biorheol Sci & Technol Minist Educ Chongqing 400004 Peoples R China

Surface topography of an orthopedic implant plays an essential role in the regulation of bone formation with surrounding bone tissue. To investigate the effects of surface topography of titanium (Ti) substrates on cellular behavior of mesenchymal stem cells (MSCs), a series of micro/nano hierarchical structures were fabricated onto micro-structured titanium (micro-Ti) substrates via a sol-gel method with spin-coat technique. Scanning electron microscopy (SEM), surface profiler, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and water contact angle measurement were employed to certify the successful fabrication of micro/nano hierarchical structures with the presence of various nano-sized TiO2 grains (20 nm, 40 nm and 80 nm, respectively) onto micro-structured surfaces. The formation mechanism of the micro/nano hierarchical structures was proposed. Moreover, the effects of those hierarchical structures on the growth behavior of MSCs were evaluated both on cellular and molecular levels in vitro. The results confirmed that micro/nano hierarchical structures with large grains (80 nm) greatly promoted the proliferation and differentiation of MSCs comparing with other small grains (20 nm and 40 nm). The study provides an alternative for the fabrication of hierarchically structured Ti implants for potential orthopedic application. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Titanium micro/nano hierarchical structure Mechanism MSCs Growth behavior

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Superhydrophobic hierarchical structures produced through novel low-cost stamp fabrication and hot embossing of thermoplastic film

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2015年第12期29卷 5107-5111页

作者： Lim, Chae-Hee Han, Sol-Yi Eo, Jae-Dong Kim, Kwang Kim, Wook-Bae Korea Polytech Univ Dept Adv Convergence Technol Grad Sch Shihung 429793 South Korea SNDENG Co Ltd Ansan 425852 South Korea Korea Polytech Univ Dept Mech Design Engn Shihung 429793 South Korea

We present a simple and cost-effective method to produce superhydrophobic surfaces in thermoplastic polymer substrates, which contain hierarchical micro/nano structures that resemble lotus leaves. The method involved the fabrication of an Al stamp through the sequential application of laser ablation and anodization to create micro- and nano-structures, respectively. The fabricated patterns on the Al stamp were replicated on the thermoplastic Cyclic olefin copolymer (COC) film surfaces through a hot embossing technique. Static water contact angles were measured to evaluate the hydrophobicity of the patterned COC surfaces. The static water contact angle on the micro/ nano hierarchical structured COC surface was measured to be 162.3A degrees on average. The hot embossing process was repeated 31 times with a nano-structured Al stamp, and the replicated COC surfaces showed consistent water contact angles.

关键词： Superhydrophobic surface micro/nano hierarchical structure Laser ablation Porous anodic aluminum Water contact angle

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