Zhigang Xu

North Carolina Agricultural and Technical State University

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Jag Sankar

North Carolina Agricultural and Technical State University

Jagannathan Sankar

North Carolina Agricultural and Technical State University

Sergey Yarmolenko

North Carolina Agricultural and Technical State University

Devdas Pai

North Carolina Agricultural and Technical State University

Yufeng Zheng

Peking University

Gukan Rajaram

North Carolina Agricultural and Technical State University

Xiaoxue Xu

Affiliated Hospital of North Sichuan Medical College

Junqiang Wang

Peking University

Hong Cai

Peking University

Salil Desai

North Carolina Agricultural and Technical State University

Cooperative Institutions

North Carolina Agricultural and Technical State University

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Southern Medical University

Peking University

Zhejiang University

Guangdong Academy of Medical Sciences

Guangdong Provincial People's Hospital

Shanghai Jiao Tong University

University of Cincinnati

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Microstructure and degradation behavior of forged Fe–Mn–Si alloys

International Journal of Modern Physics B (2015)

Zhigang Xu M. Hodgson Peng Cao

This work presents a comparative study of a series of Fe – Mn – Si alloys proposed as degradable biomaterials for medical applications. Five Fe -28wt.% Mn -x Si (where x = 0 to 8 wt.%) alloys were fabricated by an arc-melting method. All the as-cast alloys were subsequently subjected to homogenization treatment and hot forging. The microstructure and phase constituents were investigated. It is found that the grain size of the as-forged alloys ranged approximately from 30 to 50 μm. The as-forged Fe – Mn – Si alloys containing Si from 2 to 6 wt.% was comprised of duplex martensitic ε and austenitic γ phases; however, the Si -free and 8 wt.% Si alloys only consisted of a single γ phase. After 30 days of static immersion test in a simulated body fluid (SBF) medium, it is found that pitting and general corrosion occur on the sample surfaces. Potentiodynamic analysis reveals that the degradation rate of the Fe – Mn – Si alloys increased gradually with Si content up to 6 wt.%, beyond which the degradation slows down.

Font

Homogenization

10.1142/s0217979215400147

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Citations (8)

Electrophoretic deposition of YSZ electrolyte coatings for solid oxide fuel cells

Surface and Coatings Technology (2006)

Zhigang Xu Gukan Rajaram Jag Sankar Devdas Pai

Electrophoretic Deposition

Tape casting

10.1016/j.surfcoat.2006.08.045

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Citations (38)

Coalescence delay mediated by the gas layer during the impact of hot droplets

International Journal of Heat and Mass Transfer (2023)

Zhigang Xu Haicheng Qi Tianyou Wang Zhizhao Che

Coalescence (physics)

10.1016/j.ijheatmasstransfer.2023.123864

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Citations (1)

Institutional Reform and Impacts: The Case Study in the Yellow River Basin

J X Wang Zhigang Xu J. Huang Scott Rozelle

The overall goal of our paper is to better understand water management reform in China's communities, especially focusing on the effect that it will have on the nation's water resources and the rural population. To pursue this goal, the paper has three objectives. First, we track the evolution of water management reform and seek to identify the incentive mechanisms that encourage water managers to more efficiently use water. Second, we identify the impact of water management reform on crop water use, the primary motivation of the policy. Finally, the paper explores how changes in China's water management reform affect agricultural production, farmer income and poverty. Based on a random sample of 57 villages, 231 farmers and 462 plots in four large irrigation districts in Ningxia and Henan provinces, both provinces in China's Yellow River Basin, our results show that two of the main forms of water management reform, Water User Associations and contracting, individual water contractors, have begun to systematically replace traditional forms of collective management. The impacts analysis demonstrates that it is not the nominal implementation the reform that matters, but rather it is the creation of new management institutions that offer manager strong incentive to save water. Specifically, when managers in reformed organizations face strong incentive, they save water and, importantly, given China's concerns about national food production and poverty allevation, the reductions in water do not lead to reductions in either production, income or higher incidences of poverty.

Water use

Source

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Misalignment production and its prediction model in tailored blank laser welding

Zhigang Xu

Misalignment is an important quality evaluation standard in tailor welded blanks. The control of misalignment, especially for thinner blanks, is a difficult problem in tailored blank laser welding process. The production and control of misalignment is studied based on a tailored blank laser welding system. The influential factors of the misalignment are obtained after numbers of experiments: the deformation of the blanks before welding, the intensity of the clamping force, the uniformity of the clamping force, deformation of the clamping beam, flatness error of the based platform and the welding process. A mathematical model is established according to the analysis of misalignment. Experimental results indicate that the model provides an effective theorical guidance in improving welding quality.

Blank

Flatness (cosmology)

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Systematic studies on NI-YSZ anode material for Solid Oxide Fuel Cell (SOFCs) applications

International Journal of Manufacturing Research (2008)

Gukan Rajaram Salil Desai Zhigang Xu Devdas Pai Jagannathan Sankar

The characteristics of the Ni/YSZ anode material for the solid oxide fuel cells (SOFCs) were investigated in order to study the relation between the porosity and the conductivity of the cell. The experiments were planned based on a response surface design (central composite design matrix). Porosity and conductivity measurements were performed on the sintered and reduced anode material. The results indicated that the porosity values got decreased by increasing sintering temperature values, while the conductivity values increase with increasing temperature. Higher sintering temperature helped in forming a better Ni-network along the structure, which improved the electrical conductivity of the Ni-YSZ anode cermet.

Cermet

10.1504/ijmr.2008.019215

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Citations (8)

Pulsed Laser Deposition Parameter Optimization for Growth of Alumina (Al₂O₃) Thin Film on Silicon (100)

MRS Proceedings (2003)

Xinyu Wang Sergey Yarmolenko D. Kumar Zhigang Xu Jagannathan Sankar

Pulsed Laser Deposition

Deposition

10.1557/proc-788-l3.39

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Flow-induced corrosion of absorbable magnesium alloy: In-situ and real-time electrochemical study

Corrosion Science (2015)

Juan Wang Young‐Seok Jang Guojiang Wan Venkataraman Giridharan Guang‐Ling Song

10.1016/j.corsci.2015.12.020

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Citations (89)

Development of Bulk Nanostructured Metallic Biomaterials

Yufeng Zheng Xiaoxue Xu Zhigang Xu Junqiang Wang Hong Cai

A vast variety of metallic and alloy materials have been serving as biomedical devices in clinics for decades. Great efforts are being continuously contributed to the development of metals and alloys for high-end biomedical applications, such as light, ductile but strong scaffolds, high-strength and slow biodegradable implants, and controlled release of active elements and corrosion rate. Bulk nanostructured metallic and alloy materials have emerged as a new type of biomaterial with refined textures via mainly severe plastic deformation process. With nanoscale grain size, high fraction of grain boundary, and their uniform distribution, bulk nanostructured metallic and alloy biomaterials exhibit huge potential in biomedical fields for their enhanced mechanical properties, improved biocorrosion behaviors, and ameliorated biocompatible performances.

Biomaterial

Biocompatible material

Severe Plastic Deformation

10.1002/9783527342440.ch7

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Thin YSZ Electrolyte Film Depositions on Dense and Porous Substrates

Materials (2003)

Zhigang Xu Corydon D. Hilton Bobby Watkins Sergey Yarmolenko Jag Sankar

Yttria stabilized zirconia (YSZ) thin films have been processed on polished silicon and porous strontium-doped lanthanum manganite (LSM) substrates by liquid fuel combustion chemical vapor deposition from combustion of an aerosol jet. The aerosol jet consists of Y- and Zr- containing metalorganics dissolved in toluene and high-purity oxygen. The morphology and thickness of the deposited films have been analyzed with scanning electron microscope. On the polished silicon substrates, thin and uniform films have been obtained. The grain growth rate is of the first order of the deposition time. The film growth rate was greatly enhanced by utilizing higher precursor concentrations, proper substrate temperature and the effect of thermophoresis. However, when the porous substrate is being coated, a more complex deposition process takes place. The initial deposition seems to be favored on the surface protrusions. Therefore, the covered areas serve as nucleation sites and the grains start to grow, giving rise to larger particles and rougher surface than the films on polished silicon. To enhance the pore-sealing rate, some pre-treatments and post-treatment have been used. Moreover, deposition parameters towards fast pore sealing have been investigated. Thin and continuous films with the film thickness less than 3 μm have been obtained.

Deposition

10.1115/imece2003-43330

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Citations (1)