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Composition formulas of Ti alloys derived by interpreting Ti-6Al-4V

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Science China(Technological Sciences) 2021年第8期64卷 1732-1740页

作者： LIU TianYu ZHANG Shuang WANG Qing MIN xiaohua DONG Chuang Key Laboratory for Materials modification by Laser Ion and Electron BeamsDalian University of TechnologyMinistry of EducationDalian116024China School of Materials Science and Engineering Dalian Jiaotong UniversityDalian116028China

Titanium alloys are composed ofαandβphases and are classified as nearα,dual-phaseα+β,andβ*** study attempts to derive their general composition formulas within the cluster-plus-glue-atom model by interpreting Ti-6A1-4V and other popular dual-phaseα+βTi alloy s with well-established chemical *** model identifiedαmolecule-like structural unit that covers onlyαnearest-neighbor cluster along withαfew next-neighbor glue atoms,which can be represented as"[cluster](glue atoms)x".The structural units of theαandβphases in Ti-6Al-4V,α-[Al-Ti_(12)](AlTi_(2)),andβ-[Al-Ti_(14)](V2Ti),were derived first and were in an unusual unit ratio of about 2.33:*** obtain an alloy composition formula that satisfied this unit ratio,the two clusters were treated as hard spheres of different radii and packed according to the clusterplusglueatom *** calculations determined that the Ti-6A1-4V alloy unit is composed of 12α-[Al-Ti_(12)](AlTi_(2))and 5β-[Al-Ti_(14)](V2Ti)units(Ti-6.05A1-3.94V wt.%),with the fractional volume of theβphase being 32.5 vol.%,which is in agreement with experimental ***,we describe how the chemical formulas of theαand p phases explain the high temperature near-a alloys(such as Ti-1100,[Al-(Ti_(0.97)Zr_(0.03))_(12)](Al_(0.67)Si_(0.12)Sn_(0.18)mo_(0.03))_(1.01)Ti_(1.99))and high-strengthβ-Ti alloys(such as Ti-5553,[Al-Ti_(14)](Al_(0.24)Fe_(0.03)Cr_(0.20)-mo_(0.18)V0.35)_(2.45)Ti_(0.55)),respectively.

关键词： Ti-6Al-4V titanium alloys chemical formula cluster-plus-glue-atom model cluster-resonance model

Effects of Deformation and Phase Transformation Microstructures on Springback Behavior and Biocompatibility in β-Type Ti-15mo Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 621-635页

作者： Sujie Zhang xiaohua Min Yada Li Weiqiang Wang Ping Li Mingjia Li School of Materials Science and Engineering Dalian University of TechnologyNo.2 Linggong RoadGanjingzi DistrictDalian 116024China

This study examined the mechanical properties, springback behavior from three-point bending loading–unloading tests and biocompatibility from human osteoblast cell adhesion and proliferation experiments in Ti-15mo alloy with different microstructures. The springback ratio increased after the appearance of deformation microstructures including {332} twins and dislocations, due to the increased bending strength and unchanged Young’s modulus. By contrast, the change in springback ratio was dependent on the competing effect of the simultaneous increase in bending strength and Young’s modulus after phase transformation, namely, the isothermal ω-phase formation. Good cell adhesion and proliferation were observed on the alloy surface, and they were not significantly affected by the deformation twins, dislocations and isothermal ω-*** diversity of deformation and phase transformation microstructures made it possible to control the springback behavior effectively while keeping the biocompatibility of the alloy as an implant rod used for spinal fixation devices.

关键词： Titanium alloys Spinal fixation Springback behavior Deformation microstructures Phase transformation Biocompatibility

Extra low friction coefficient caused by the formation of a solid-like layer:A new lubrication mechanism found through molecular simulation of the lubrication of moS_2 nanoslits

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2412-2419页

作者： Jiahui Li Yudan Zhu Yumeng Zhang Qingwei Gao Wei Zhu xiaohua Lu Yijun Shi College of Chemical Engineering State Key Laboratory of Materials-oriented Chemical Engineering Nanjing Tech University Energy Engineering Division of Energy Science Lule? University of Technology Division of Machine Elements Lule? University of Technology

monolayer molybdenum disulfide(moS2) is a novel two-dimensional material that exhibits potential application in lubrication technology. In this work, molecular dynamics was used to investigate the lubrication behaviour of different polar fluid molecules(i.e., water, methanol and decane) confined in monolayer mo S2 nanoslits. The pore width effect(i.e., 1.2, 1.6 and 2.0 nm) was also evaluated. Results revealed that decane molecules exhibited good lubricating performance compared to the other two kinds of molecules. The friction coefficient followed the order of decane b methanol b water, and decreased evidently as the slit width increased, except for decane. Analysis of the spatial distribution and mobility of different confined fluid molecules showed that a solid-like layer was formed near the slit wall. This phenomenon led to the extra low friction coefficient of confined decane molecules.

关键词： molecular dynamics simulation Microstructure molybdenum disulfide Residence time distribution

Renewable molybdate complexes encapsulated in anion exchange resin for selective and durable removal of phosphate

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Chinese Chemical Letters 2021年第11期32卷 3382-3386页

作者： Wei Zhu xiaohua Huang Yi Zhang Zhonglong Yin Zhen Yang Weiben Yang School of Chemistry and Materials Science Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution ControlNanjing Normal UniversityNanjing 210046China

The existence of many anions in wastewater reduces the removal efficiency of phosphate by adsorbents under realistic *** this challenge,the study reports on an insistent and stable composite adsorbent of molybdate complexes Fe-(moO_(x))embedded in a macroporous anion exchange resin(D-201).[Fe(moO_(x))]-D-201 shows 93.7%adsorption capacity(28.3 mg/g)for phosphate even when the molar concentration of coexisting ions is 5 times higher than *** capacity of adsorbent is maintained more than 84.2%after five regeneration cycles to remove phosphate in the wastewater containing coexisting *** ability of highly selective removal of phosphate is maintained during the regeneration cycles explained by the change of the binding of molybdate clusters with phosphate,which is due to the different structures of molybdate clusters depending on various *** general,this work puts forward a new idea for the development of phosphorus removal adsorbents for the treatment of wastewater containing coexisting ions.

关键词： molybdate composite adsorbent Resin Phosphate removal Selective and durable adsorption Structural transformation of complexes

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新型多功能厘米波频率合成器设计

压电与声光 2024年第2期46卷 171-173页

作者：莫馁杨航穆晓华中国电子科技集团公司第二十六研究所重庆400060

该文介绍了一种新型多功能厘米波频率合成器,利用锁相倍频的方式,首次将直接数字频率合成器(DDS)输出的连续波(步进1 MHz)、常规脉冲、重频抖动、重频参差、双脉冲、捷变频信号、组变信号、二相编码和线性调频等信号搬移至0.8~18 GHz频... 详细信息

该文介绍了一种新型多功能厘米波频率合成器,利用锁相倍频的方式,首次将直接数字频率合成器(DDS)输出的连续波(步进1 MHz)、常规脉冲、重频抖动、重频参差、双脉冲、捷变频信号、组变信号、二相编码和线性调频等信号搬移至0.8~18 GHz频段,外形尺寸为76 mm×70 mm×10 mm,体积约为传统类似频率综合器项目的1/20,具有工作频带宽、频率高、体积小等优点。

关键词：频率合成器线性调频二相编码宽频带小体积

A Confocal Endoscope for Cellular Imaging

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Engineering 2015年第3期1卷 351-360页

作者： Jiafu Wang Min Yang Li Yang Yun Zhang Jing Yuan Qian Liu xiaohua Hou Ling Fu Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology moE Key Laboratory for Biomedical Photonics Department of Biomedical Engineering Huazhong University of Science and Technology Division of Gastroenterology Union Hospital Tongji Medical College Huazhong University of Science and Technology mo E Key Laboratory for Biomedical Photonics Department of Biomedical Engineering Huazhong University of Science and Technology

Since its inception, endoscopy has aimed to establish an immediate diagnosis that is virtually consistent with a histologic diagnosis. In the past decade, confocal laser scanning microscopy has been brought into endoscopy, thus enabling in vivo microscopic tissue visualization with a magnification and resolution comparable to that obtained with the ex vivo microscopy of histological specimens. The major challenge in the development of instrumentation lies in the miniaturization of a fiber-optic probe for microscopic imaging with micron-scale resolution. Here, we present the design and construction of a confocal endoscope based on a fiber bundle with 1.4-μm lateral resolution and 8-frames per second(fps) imaging speed. The fiber-optic probe has a diameter of 2.6 mm that is compatible with the biopsy channel of a conventional endoscope. The prototype of a confocal endoscope has been used to observe epithelial cells of the gastrointestinal tracts of mice and will be further demonstrated in clinical trials. In addition, the confocal endoscope can be used for translational studies of epithelial function in order to monitor how molecules work and how cells interact in their natural environment.

关键词： cellular resolution confocal endoscopy optical biopsy