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Preparation,characterization,and tribological properties of silicananoparticle-reinforced B–N-co-doped reduced graphene oxide as a multifunctional additive for enhanced lubrication

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Friction 2021年第2期9卷 239-249页

作者： Sang XIONG Baosen ZHANG Shuai LUO Hao WU Zhen ZHANG College of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167China School of Materials Science and Engineering Shanghai UniversityShanghai 200000China

Microwave-synthesized SiO_(2)-reinforced B–N-co-doped reduced graphene oxide(SiO_(2)–B–N–GO)nanocomposites were characterized by X-ray photon spectroscopy(XPS),X-ray diffraction(XRD),infrared(IR)spectroscopy,and transmission electron microscopy/energy dispersive X-ray(TEM/EDX)*** tribological properties of the SiO2–B–N–GO prepared as anti-wear additives for enhanced lubrication were studied using a four-ball *** experiment results indicated that SiO_(2)–B–N–GO exhibits excellent load-carrying,anti-wear,and anti-friction properties in a base oil,especially at the optimal concentration of additives at 0.15 wt%.The wear scar diameter decreased from 0.70 to 0.37 mm and the coefficient of friction was reduced from 0.092 to 0.070,which reductions are attributed to the formation of B–N and graphene layer tribofilms of several tens of nanometers in thickness that prevented direct contact between metals.

关键词： SiO2-B-N-GO nanocomposites material characterization tribological properties

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Correlation between Microstructure and Failure Mechanism of Hyriopsis cumingii Shell Structure

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Journal of Bionic Engineering 2019年第5期16卷 869-881页

作者： Zhen Zhang Jun Zhu Yajie Chu Zhengnian Chen Shun Guo Junqiang Xu School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

In nature,shells exhibit remarkable high toughness and impact resistance to the external load despite their brittle main constituent and simple hierarchical *** this work,the structure of the mussel shell Hyriopsis cumingii is analyzed by scanning electron micro scope and atomic force microscope,and the macro/micro compression and impact tests are *** show that the shell has a three-layer structure:an outer cuticle layer,a prismatic layer,and a nacreous *** stiffer and load-dependent prismatic layer is conducive to improve the impact resistance of shell *** morphology after failure proves that cracks are transgranularly propagated inside the prism and aragonite platelet,and the crack deflection and platelet pullout can effectively lock the stress,thereby eventually improving the impact-resistance and toughness of the shell.

关键词： Hyriopsis cumingii shell microstructure macro/micro mechanical property crack propagation

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A hygro-thermo-mechanical constitutive model for shape memory polymers filled with nano-carbon powder

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International Journal of Smart and Nano materials 2021年第3期12卷 286-306页

作者： Jianping Gu Xiaopeng Zhang Hao Duan Mengqi Wan Huiyu Sun Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and EngineeringNanjing Institute of TechnologyNanjingChina State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjingChina

The nano-carbon powders are often used as fillers to endow the shape memory polymers(SMPs)with *** has been found that the shape memory effects(SMEs)of SMPs filled with nano-carbon powder can be triggered both by temperature and by *** reveal the driving mechanism of SMEs,a constitutive model for describing the thermally activated and moisture activated SMEs of these shape memory polymer composite(SMPCs)is developed *** both of the SMEs share the same driving mechanism,the variable moisture is incorporated into the framework of a thermo-mechanical modeling approach to disclose the effect of moisture on the thermoviscoelastic *** SMPCs are regarded as isotropic materials and the effect of carbon powder on the mechanical properties of the matrix is also considered in the *** the complete recovery may not be reached even they are exposed to the stimulus environment long enough,the blocking mechanism is also considered *** is the mainly new contribution compared to the early *** the method of parameter determination presented here,the effectiveness of the proposed hygro-thermo-mechanical constitutive model is confirmed by comparing the model results with the test data of uniaxial deformation from the literature.

关键词： Shape memory polymer composites nano-carbon powder hygro-thermomechanical constitutive model thermodynamics internal state variables

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The influence of alternating cyclic dynamic loads with different low frequencies on the bio-corrosion behaviors of AZ31B magnesium alloy in vitro

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Bioactive materials 2022年第1期7卷 263-274页

作者： Linyuan Han Zhenwei Zhang Jianwei Dai Xuan Li Jing Bai Zhihai Huang Chao Guo Feng Xue Chenglin Chu School of Materials Science and Engineering Southeast UniversityNanjing211189JiangsuChina Jiangsu Key Laboratory for Advanced Metallic Materials Southeast UniversityNanjing211189JiangsuChina School of Materials Engineering Nanjing Institute of TechnologyNanjing211189JiangsuChina Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211189China

The real physiological environment of human body is complicated with different degrees and forms of dynamic loads applied to implanted medical devices due to the daily activities of the patients,which would have impacts on the degradation behaviors of magnesium alloy *** this work,the bio-corrosion behaviors of AZ31B magnesium alloy under alternating cyclic dynamic loads with different low frequencies(0.1-2.5 Hz)were specially *** was found that the bio-degradation performances under external dynamic stressed conditions were much severer than those under unstressed conditions and static *** corrosion rates were generally accelerated as the rise of cyclic *** a numerical model for the degradation process of Mg alloy was *** corrosion current density icorr of Mg alloy and the applied loading frequency f matches a linear relationship of ln icorr∝f,which is the result of interactions between the cyclic alternating load and corrosive *** work could provide a theoretical reference and an experimental basis for further researches on the biodegradation behaviors of biomedical materials under dynamic conditions.

关键词： Magnesium alloy Biocorrosion Fatigue Frequency

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Reactive-sintering B_4C matrix composite for armor applications

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Rare Metals 2020年第5期39卷 529-544页

作者： Chao Wu Yun-Kai Li Chun-Lei Wan Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing 211167China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

The B4C matrix composite intended for armor applications still presents restrictions,such as low sintering density,production of large parts and inherited brittleness Herein,research on this topic is discussed in *** the material outlook of armor applications is organized from the development of composite armor and ceramic materials for armor to the B4C matrix composite and reactive-sintering *** the second section,the technologies are reviewed for reactive pressureless sintering reactive hot-pressing sintering,reactive discharge plasma sintering and self-propagating high-temperature sintering Thereafter,our previous works on the TiB2/SiC/B4C composite and laminated Ti/B4C composite are employed to illustrate their microstructural evolution,phase transformation and fracture *** studies provide a potential method for producing tough and high-strength ceramic composites for armor *** the fina section,the mechanism,evaluation method and influencing factors of anti-penetration for ceramic armor and B4C matrix composite are reviewed.

关键词： Composite armor B4C matrix composite Reactive sintering Mechanical properties

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Effect of Oxygen on Microstructure Evolution and Glass Formation of Zr-based Metallic Glasses

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Journal of Iron and Steel Research International 2016年第1期23卷 78-82页

作者： Jia-lin CHENG Guang CHEN Qiang-qiang ZENG Lu YUN Feng XU Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167 JiangsuChina School of Materials Science and Engineering Nanjing Institute of Technology Nanjing 211167 JiangsuChina Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing Universily of Science and Technology Nanjing 210094 Jiangsu China

The effect of oxygen on the microstructure evolution and glass formation of Zr-based bulk metallic glasses（BMGs）was studied in *** was found that oxygen did not form oxides or dissolve in glass matrix,but induced the precipitation ofα-Zr which has the high affinity and solubility of oxygen in the Zr-based bulk metallic glass（ZrBMG）.With the precipitation ofα-Zr,the remaining melts contain much lower oxygen content and have strong glass formation,resulting in the formation ofα-Zr/BMG *** findings provide an important insight into the mechanism of the oxygen on glass formation,and give us a useful guideline to avoid the oxygen detrimental for designing new BMGs.

关键词： amorphous material rapid solidification quenching microstructure

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Effect of solution concentration on sealing treatment of Mg-Al hydrotalcite film on AZ91D Mg alloy

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Journal of Magnesium and Alloys 2017年第3期5卷 320-325页

作者： Qiangsheng Dong Zhixin Ba Yongqiang Jia Yongjun Chen Xiaoyu Lv Xiaobo Zhang Zhangzhong Wang School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167PR China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167PR China

Cerium-based sealing treatment was developed for Mg-Al hydrotalcite film on AZ91D Mg alloy,and the influence of cerium salt solution was investigated to modify the surface integrity and corrosion *** electron microscope(SEM)and X-ray diffraction(XRD)measurements were carried out to analyze the surface morphology and phase *** corrosion resistance of Mg-Al hydrotalcite film after sealing treatment was evaluated by the polarization curve and electrochemical impedance spectroscopy(EIS)*** results showed that lower concentration of Ce-containing solution was beneficial to seal the micro-cracks on Mg-Al hydrotalcite film,and improve the surface integrity and corrosion resistance;higher concentration of Ce-containing solution could seal fewer micro-cracks,and the corrosion resistance was decreased owing to the disintegration of Mg-Al hydrotalcite film.

关键词： Mg alloy Mg-Al hydrotalcite film Ce-containing solution Sealing treatment Corrosion resistance

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Effects of chloride on electrochemical and stress corrosion cracking behavior of 9Cr ferritic-martensitic steel

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Journal of Iron and Steel Research International 2020年第6期27卷 719-731页

作者： Zhen Zhang Zheng-fei Hu Liang He Xiao-bo Zhang Xin-xian Fang Bao-sen Zhang Zhi-xin Ba Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167JiangsuChina School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167JiangsuChina School of Materials Science and Engineering Tongji UniversityShanghai 201804China School of Materials Science and Engineering Georgia Institute of TechnologyAtlanta 30332-0620USA

The electrochemical and stress corrosion cracking behavior of 9Cr ferritic-martensitic steel is investigated in the chloride environment by using the traditional electrochemical method, the scanning vibrating electrode technique and the slow strain rate test (SSRT). Results of the static corrosion tests and corrosion morphology show that the prior austenite grain boundaries and martensite lath boundaries are the preferred sites for pit nucleation and growth in chloride environment. Results of SSRT coupled with insitu electrochemical test show that the transition from pitting corrosion to uniform corrosion, as well as the nucleation of stress corrosion crack, is the synergistic effects of the chloride and applied load. Stress corrosion cracking of the steel in the chloride environment can be divided into three different regions as follows: fast and uniform corrosion activ-ity, microcrack nucleation and propagation, and active crack growth regions.

关键词： 9Cr ferritic-martensitic steel Chloride In situ electrochemical test Scanning vibrating electrode technique Stress corrosion cracking

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Calculating and measuring contact angles of Zn-4.5%Al melt on Ceria substrates

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materials Research Innovations 2015年第Sup8期19卷 788-791页

作者： Zhou, H. Gu, M. He, X. Bai, Y. Wang, Z. Key Laboratory of Advanced Structural Materials and Application Technology of Jiangsu Province Jiangsu Nanjing211167 China Department of Material Engineering Nanjing Institute of Technology Nanjing211167 China

The wetting behaviour of Zn?4.5%Al melts (ZA) on Ceria substrates was analysed in terms of surface tension, contact angle and chemical reactivity. Equilibrium equation calculating stable contact angle between high-energy interfaces was presented. The apparent contact angles of ZA melts on the untreated and treated CeO2-baseplates in argon were measured by the sessile drop method and the influence of a carbonisation layer on wetting was discussed. The results show that simplified Good-Girifalco equation can be used to predict contact angles of metal/ ceramic couples, and that, from classical thermodynamic point of view, reactions between the carbonisation layer and zinc oxide may take place at the interface, which promotes the wetting. As a result, the contact angle decreases from 111.6° to 87.6° and ZA liquid can wet CeO2 substrate. © W. S. Maney & Son Ltd 2015.

关键词： Contact angle

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Effect of dual gradient structure on high-temperature performance of CoCrFeNiW 0.8 alloy processed by ultrasonic-assisted laser cladding

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Surface and Coatings technology 2025年

作者： Jianbin Zhang Qi Sui Ying Han Rui Zhang Xiaolei Song Xu Ran Shuai Wang Shiyu He Key Laboratory of Advanced Structural Materials Ministry of Education Changchun University of Technology Changchun 130012 China School of Materials Science and Engineering Changchun University of Technology Changchun 130012 China Jilin Provincial Key Laboratory of Advanced Materials Processing and Application for Rail Transit Changchun University of Technology Changchun 130012 China

Outstanding High-temperature performance CoCrFeNiW 0.8 were prepared by ultrasonic-assisted laser cladding (UALC), which are promising candidates for extreme environment. A dual-gradient microstructure, achieved at 50 % amplitude, characterized by refined grains accompanied by uniformly dispersed granular μ-phase near the surface, transitioning to coarser grains along with a networked μ-phase within the interior. This dual-gradient structure significantly enhances the high-temperature tensile properties and wear resistance of the CoCrFeNiW0.8 alloy at 900 °C. The improved tensile strength (100.74 % increase in UTS) originates from the back stress (HDI) strengthening and strain gradient caused by heterogeneous deformation of the dual-gradient structure. Meanwhile, the minimum friction coefficient and wear rate (93.25 % reduction) are mainly attributed to the high-temperature stability of the μ-phase, coordinated stress distribution, and dislocation pinning effect.

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