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New Inclusion Assessment Method in Aluminum Alloys——Electrochemical Method for Inclusion Assessment

Chinese Journal of Mechanical Engineering 2011年第1期24卷 160-166页

作者： XU Zhengbing ZOU Yongzhi zeng jianmin State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi ＇an 710072 China

The existence of inclusion influences the properties of aluminum alloy castings,from which the castings will face scrapping under severe *** efforts on the inclusions in aluminum alloy were made and many inclusion assessment methods were put ***,most of the current methods are characterized by time consuming and expensive equipment cost,which limits the application in aluminum *** the aluminum properties are sensitive to the inclusion,this paper tries to establish a new kind of inclusion assessment *** inclusions were introduced to aluminum melts by adding aluminum *** samples with different inclusion contents were *** microstructure contained inclusions was *** inclusion was automatically identified with an image analyzer by setting different grey threshold value,and the inclusion content was *** image analysis shows that inclusions wreck the continuity of the alloy matrix seriously,and the inclusion area percentage increases with the increasing of aluminum *** high and low polarization measurements were conducted in 3.5 wt% NaCl aqueous solution at the temperature of 25 ℃.The electrochemical parameters of the testing materials,such as corrosion potential E k,corrosion current density I k and the linear polarization resistance R p,were *** polarization measurement results show that the linear polarization resistances decrease,the corrosion potentials move towards more negative direction,and the corrosion current densities increase with the increasing of inclusion *** theoretical analysis of the inclusion content and the corrosion current density was *** existence of inclusions makes the microstructure form corrosion microcells between the alloy matrix and *** impressed current can accelerate the current velocity or corrosion current *** regression model of the inclusion contents *** corrosion current density was *** model can

关键词： aluminum alloys inclusion assessment electrochemical parameters electrochemical method for inclusion assessment (EcMIA)

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Crystallographic Characteristic of Intermetallic Compounds in Al-Si-Mg Casting Alloys Using Electron Backscatter Diffraction

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 305-311页

作者： ZOU Yongzhi XU Zhengbing HE Juan zeng jianmin State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi＇ an 710072 China Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education Guangxi University Nanning 530004 China

The Al-Si-Mg alloy which can be strengthened by heat treatment is widely applied to the key components of aerospace and aeronautics. Iron-rich intermetallic compounds are well known to be strongly influential on mechanical properties in Al-Si-Mg alloys. But intermetallic compounds in cast Al-Si-Mg alloy intermetallics are often misidentified in previous metallurgical studies. It was described as many different compounds, such as AlFeSi, Al8Fe2Si, Al5（Fe, Mn）3Si2 and so on. For the purpose of solving this problem, the intermetallic compounds in cast Al-Si alloys containing 0.5% Mg were investigated in this study. The iron-rich compounds in Al-Si-Mg casting alloys were characterized by optical microscope（OM）, scanning electron microscope（SEM）, energy dispersive X-ray spectrometer（EDS）, electron backscatter diffraction（EBSD） and X-ray powder diffraction（XRD）. The electron backscatter diffraction patterns were used to assess the crystallographic characteristics of intermetallic compounds. The compound which contains Fe/Mg-rich particles with coarse morphologies was Al8FeMg3Si6 in the alloy by using EBSD. The compound belongs to hexagonal system, space group P6_2m, with the lattice parameter a=0.662 nm, c=0.792 nm. The β-phase is indexed as tetragonal Al3FeSi2, space group I4/mcm, a=0.607 nm and c=0.950 nm. The XRD data indicate that Al8FeMg3Si6 and Al3FeSi2 are present in the microstructure of Al-7Si-Mg alloy, which confirms the identification result of EBSD. The present study identified the iron-rich compound in Al-Si-Mg alloy, which provides a reliable method to identify the intermetallic compounds in short time in Al-Si-Mg alloy. Study results are helpful for identification of complex compounds in alloys.

关键词： Al-Si-Mg alloys intermetallic compound electron backscatter diffraction(EBSD) X-ray powder diffraction(XRD)

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Layered double hydroxide coatings on magnesium alloys: A review

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Journal of Materials Science & Technology 2018年第9期34卷 1455-1466页

作者： Lian Guo Wei Wu Yongfeng Zhou Fen Zhang Rongchang zeng jianmin zeng College of Material Science and Engineering Shandong University of Science and Technology Ministry-Province Jointly-constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials Guangxi University

Layered double hydroxides（LDHs） as a class of anionic clays have extensive applications due to their unique structures. Nowadays, the emphasis is laid on the development of LDH coatings for corrosion resistance and medical applications. Thus, this review highlights synthetic methods of LDH coatings and LDH-based composite coatings on magnesium alloys. Special attention is focused on self-healing,biocompatible and self-cleaning LDH-based composite coatings on magnesium alloys.

关键词： Layered double hydroxides Magnesium alloys Corrosion resistance Self-healing Biocompatibility Self-cleaning

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Recent advances in halide perovskite memristors:From materials to applications

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Frontiers of physics 2024年第2期19卷 73-104页

作者： Sixian Liu jianmin zeng Qilai Chen Gang Liu Department of Micro/Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Aerospace Science&Industry Shenzhen(Group)Co.Ltd. Shenzhen 518000China

With the emergence of the Internet of Things(IoT)and the rapid growth of big data generated by edge devices,there has been a growing need for electronic devices that are capable of processing and transmitting data at low power and high *** Complementary Metal-Oxide-Semiconductor(CMOS)devices are nonvolatile and often limited by their ability for certain IoT applications due to their unnecessary power consumption for data movement in von Neuman architecture-based *** has led to a surge in research and development efforts aimed at creating innovative electronic components and systems that can overcome these shortcomings and meet the evolving needs of the information era,which share features such as improved energy efficiency,higher processing speeds,and increased *** are a novel type of electronic device that has the potential to break down the barrier between storage and *** storing data and processing information within the same device,memristors can minimize the need for data movement,which allows for faster processing speeds and reduced energy *** further improve the energy efficiency and reliability of memristors,there has been a growing trend toward diversifying the selection of dielectric materials used in *** perovskites(HPs)have unique electrical and optical properties,including ion migration,charge trapping effect caused by intrinsic defects,excellent optical absorption efficiency,and high charge mobility,which makes them highly promising in applications of *** this paper,we provide a comprehensive overview of the recent development in resistive switching behaviors of HPs and the underlying ***,we summarize the diverse range of HPs,their respective performance metrics,as well as their applications in various ***,we critically evaluate the current bottlenecks and possible opportunities in the future research of HP memristors.

关键词： halide perovskite memristor mechanism neuromorphic computing non-volatile memory

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Heat Transfer during the Solidification of Hot Dip Aluminizing Coating

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Chinese Journal of Mechanical Engineering 2011年第3期24卷 460-465页

作者： XIAO Gang SHANGGUAN Qi LU Yuheng HUANG Caimin zeng jianmin Key Laboratory of Nonferrous Materials and New Processing Technology of Ministry of Education of China Guangxi University Nanning 530004 China

Hot dip aluminizing is one of the most effective methods of surface protection for steels and is gradually gaining *** the pulling speed is one of the most important parameters to control the coating thickness of aluminizing products,however,there are few publications on the mathematical modeling of pulling speed during the hot dip *** order to describe the correlation among the pulling speed,coating thickness and solidification time,the principle of mass and heat transfer during the aluminizing process is investigated in this *** mathematical models are based on Navier-Stokes equation and heat transfer *** using the self-designed equipment are carried out to validate the mathematical ***,aluminum melt is purified at 730 ℃.The Cook-Norteman method is used for the pretreatment of Q235 steel *** temperature of hot dip aluminizing is set to 690 ℃ and thedipping time is set to 3 min.A direct current motor with stepless speed variation is used to adjust the pulling *** temperature change of the coating is recorded by an infrared thermometer,and the coating thickness is measured by using image *** validate experiment results indicate that the coating thickness is proportional to the square root of pulling speed for the Q235 steel plate,and that there is a linear relationship between coating thickness and solidification time when the pulling speed is lower than 0.11 m/*** prediction of the proposed model fits well with the experimental observations of the coating thickness.

关键词： hot dip aluminizing coating model solidification heat transfer

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Investigation on microstructure and internal friction for low density TiB_2/ZL114 composites

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Acta Metallurgica Sinica(English Letters) 2009年第3期22卷 211-218页

作者： Wenmao HUANG Haihong ZHAN Lingyan XU Zhengbing XU jianmin zeng Key Laboratory of Nonferrous Materials ＆ New Processing Technology Ministry of Education Guangxi University Nanning 530004 China

TiB2/ZL114 composites with the density of 2.733 g/cm^3 were fabricated through reaction of K2TiF4 and KBF4 （LSM method）. The composites were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The internal friction measurements were performed on DTM-II-J dynamic modulus damping analyzer and the mechanisms were investigated. Experimental results indicate that reinforced particles are well-distributed in the matrix and the internal friction value of TiB2/ZL114 composites is up to a maximum of 9.04×10^-3, almost twice that of ZL114. The internal friction results form dislocation vibration within the material, the sliding of grain boundary and phase interface, and together with the micro-plastic deformation caused by difference in coefficients of thermal expansion and elasticity modulus of various phases. The average internal friction values of samples with the sizes of 40 mm×4 mm×2 mm, 40 mm×8 mm×2 mm and 40 mm×25 mm×2 mm are 8.83 ×10^-3, 8.89 × 10^-3, and 8.93× 10^-3, respectively. Thus, the developed composites are of low density, high internal friction, and the sizes of samples have no relation to the internal friction behavior.

关键词： LSM method TiB2/ZL114 composites Internal friction

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Damping behavior of Ti_(50.1)Ni_(49.9) alloy in reverse martensitic transformation region

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Science China(Technological Sciences) 2012年第2期55卷 470-474页

作者： zeng jianmin JIANG HaiChang LIU ShuWei RONG LiJian Institute of Metal Research Chinese Academy of sciencesShenyang 110016China

Damping behavior of Ti50.1Ni49.9 shape memory alloy during reverse martensitic transformation has been investigated by dynamic mechanical analyzer in a dual-cantilever mode. With the increase of strain amplitude, internal friction （IF） of the alloy increases in martensite and austenite states while decreases in transformation region. Based on the regularity of IF attenuation in isothermal condition, IFTr and （IFpT＋ 1FI） are decomposed from the strain amplitude dependent IF in transformation region. For practical application of shape memory alloys as a damping material, it is significant to evaluate the damping capacity by eliminating the influence of IFTr and consider its time independent real IF （IFpT＋ IFI）.

关键词： internal friction attenuation strain amplitude martensitic transformation shape memory alloys

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Effect of Mo Addition on the Microstructure and Properties of TiNiNb Alloy

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Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 217-222页

作者： Haichang Jiang Ying Chen Dan Yang Hongding Sun jianmin zeng Lijian Rong Institute of Metal Research Chinese Academy of Sciences

The influence of Mo addition on the microstructure and properties of TiNiNb alloy with 4.5 at.% Nb has been investigated systemically. The experimental results indicated that the uniform distribution of Mo depresses the appearance of coarse 13-Nb particles at the grain boundaries and short stripped texture consisting of abundant fine disperse Nb-rich particles appears around the grain boundaries. The yield strength of the alloy was enhanced from 450 to 600 MPa due to the solution strengthening of Nb and Mo and the elongation reached 18% when the Mo content is 0.5 at.%. At the same time, the shape memory effect of the alloy also is improved significantly by the Mo addition. The maximum recoverable strain of the alloy with 0.5 at.% Mo is near 8% and has reached the high level of Ni-Ti binary alloys. This novel high- strength alloy is promising to be used for high pressure tube and the macro-scale coupling with higher-quality requirements.

关键词： Shape memory alloy Yield strength Recoverable strain Pipe coupling

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A Qi compatible wireless power receiver with integrated full-wave synchronous rectifier

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Science China(Information Sciences) 2018年第12期61卷 226-228页

作者： Chubin WU Zhang ZHANG jianmin zeng Xin CHENG Guangjun XIE School of Electronics Science and Applied Physics Hefei University of Technology

Dear editor,Wireless power transfer (WPT) is widely used in recent years [1]. Many applications, such as biomedical implants, battery chargers of portable electronic devices and electric vehicles already adopt [2–4] or will adopt [5] this approach. Industry consortia, such as the wireless power consortium (WPC), have been established to regulate

关键词： MOSFET A Qi compatible wireless power receiver with integrated full-wave synchronous rectifier AC

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正向电压对赤泥等离子体电解氧化层结构和耐蚀性的影响

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材料导报 2019年第22期33卷 3720-3726页

作者：刘世丰曾建民西北工业大学材料学院凝固技术国家重点实验室

以赤泥(RM)为电解液添加剂,采用等离子体电解氧化(PEO)技术在5005铝合金表面制备一层复合陶瓷层,研究了不同正向电压对陶瓷层厚度、组织结构和耐腐蚀性能的影响。结果表明:随正向电压的升高,陶瓷层生长加快,厚度增大,氧化时间为20 min时... 详细信息

以赤泥(RM)为电解液添加剂,采用等离子体电解氧化(PEO)技术在5005铝合金表面制备一层复合陶瓷层,研究了不同正向电压对陶瓷层厚度、组织结构和耐腐蚀性能的影响。结果表明:随正向电压的升高,陶瓷层生长加快,厚度增大,氧化时间为20 min时,陶瓷层的最大厚度可达35.33μm;陶瓷层的表面粗糙度不断增大,最小为0.68μm,最大可达4.21μm;陶瓷层的表面孔隙率先减小后增大,最小为24.36%。陶瓷层主要由γ-Al 2O 3、少量的无定形相和α-Al 2O 3以及微量的赤泥矿物组成,但升高正向电压并不能有效地促进赤泥颗粒参与成膜。电化学阻抗谱(EIS)与动电位极化(PDP)的试验结果一致,表明陶瓷层的耐腐蚀性能随正向电压的升高先增强后减弱,当正向电压为475~525 V时,陶瓷层的腐蚀电流密度和腐蚀速率较小,阻抗较大,耐腐蚀性能较好。赤泥颗粒的存在在一定程度上改善了陶瓷层的结构和耐腐蚀性能。

关键词：赤泥等离子体电解氧化技术 5005铝合金正向电压耐腐蚀性能

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