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Advancements in enhancing corrosion protection of Mg alloys:A comprehensive review on the synergistic effects of combining inhibitors with PEO coating

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Journal of Magnesium and Alloys 2024年第2期12卷 465-489页

作者： Arash Fattah-alhosseini Abdelhameed Fardosi Minoo Karbasi Mosab Kaseem Department of Materials engineering Faculty of EngineeringBu-Ali Sina UniversityHamedanIran Department of Nanotechnology and Advanced Materials engineering Sejong UniversitySeoul 05006Republic of Korea

Magnesium(Mg)alloys are lightweight materials with excellent mechanical properties,making them attractive for various applications,including aerospace,automotive,and biomedical ***,the practical application of Mg alloys is limited due to their high susceptibility to *** electrolytic oxidation(PEO),or micro-arc oxidation(MAO),is a coating method that boosts Mg alloys'corrosion ***,despite the benefits of PEO coatings,they can still exhibit certain limitations,such as failing to maintain long-term protection as a result of their inherent *** address these challenges,researchers have suggested the use of inhibitors in combination with PEO coatings on Mg *** are chemical compounds that can be incorporated into the coating or applied as a post-treatment to further boost the corrosion resistance of the PEO-coated Mg *** inhibitors,whether organic or inorganic,can act by forming a protective barrier,hindering the corrosion process,or modifying the surface properties to reduce susceptibility to *** can be made of various materials,including polyelectrolyte shells,layered double hydroxides,polymer shells,and mesoporous inorganic *** corrosion inhibitors in containers fully compatible with the coating matrix and substrate is a promising approach for their *** studies of the combination of inhibitors with PEO coatings on Mg alloys have shown promising results,demonstrating significant corrosion mitigation,extending the service life of Mg alloy components in aggressive environments,and providing self-healing *** general,this review presents available information on the incorporation of inhibitors with PEO coatings,which can lead to improved performance of Mg alloy components in demanding environments.

关键词： Inhibitor Mg alloy Self-healing coating Plasma electrolytic oxidation(PEO) Corrosion protection

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Hot deformation behavior of microstructural constituents in a duplex stainless steel during high-temperature straining

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 953-960页

作者： Amir Momeni Shahab Kazemi ali Bahrani Materials Science and engineering Department Hamedan University of Technology Department of Materials engineering Faculty of EngineeringBu Ali Sina University

The hot deformation characteristics of 1.4462 duplex stainless steel （DSS） were analyzed by considering strain partitioning between austenite and ferrite constituents. The individual behavior of ferrite and austenite in microstructure was studied in an iso-stress condition. Hot compression tests were performed at temperatures of 800-1100~C and strain rates of 0.001-1 s-1. The flow stress was modeled by a hyperbolic sine constitutive equation, the corresponding constants and apparent activation energies were determined for the studied alloys. The constitutive equation and law of mixture were used to measure the contribution factor of each phase at any given strain. It is found that the contribution factor of ferrite exponentially declines as the Zener-HoUomon parameter （Z） increases. On the contrary, the austenite contribution polynomially increases with the increase of Z. At low Z values below 2.6. x 1015 （lnZ---35.5）, a negative contribution factor is determined for austenite that is attributed to dynamic recrystallization. At high Z values, the contribution factor of austenite is about two orders of magnitude greater than that of ferrite, and therefore, austenite can accommodate more strain. Microstructural characterization via electron back-scattered diffraction （EBSD） confirms the mechanical results and shows that austenite recrystallization is possible only at high temperature and low strain rate.

关键词： duplex stainless steel compression testing strain partitioning high temperature operations deformation

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辊速差对连铸连轧7075铝板显微组织、织构及力学性能的影响

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 901-912页

作者： Mohammad Mehdi AMIRI Faramarz FERESHTEH-SANIEE Department of mechanical engineering Faculty of EngineeringBu-Ali Sina UniversityHamedan 65178Iran

研究辊速差对连铸连轧7075铝板显微组织、织构及力学性能的影响。采用3种不同上辊/下辊转速比(ω/ω0,ω为上辊转速,ω0为下辊转速)1:1、1:1.2及1:1.4进行多次试验。结果显示,在最大辊速差条件下(ω/ω0=1:1.4),7075铝板在轧制方向的屈... 详细信息

研究辊速差对连铸连轧7075铝板显微组织、织构及力学性能的影响。采用3种不同上辊/下辊转速比(ω/ω0,ω为上辊转速,ω0为下辊转速)1:1、1:1.2及1:1.4进行多次试验。结果显示,在最大辊速差条件下(ω/ω0=1:1.4),7075铝板在轧制方向的屈服强度和极限抗拉强度分别提高41.5%和21.9%。此外,当辊速比ω/ω0为1:1.4时,成品轧制板的平均晶粒尺寸减小36%,横剖面平均硬度增加约9.2%。织构研究结果显示,辊速差越大,成品各向同性及硬度越大。然而,采用不同辊速度的连铸连轧会导致变形板伸长率降低约6%。

关键词：连铸连轧 7075铝合金辊速差显微组织力学性能织构各向异性

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Effects of thermal boundary conditions on the joule heating of electrolyte in a microchannel

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Journal of Hydrodynamics 2016年第5期28卷 850-862页

作者： M. Y. ABDOLLAHZADEH JAMALABADI J. H. PARK M. M. RASHIDI J. M. CHEN Department of Ship engineering Chabahar Maritime University Chabahar Iran Department of Aerospace and System engineering Gyeongsang National University Jinju Korea . engineering faculty of bu-ali sina university Hamedan Iran Department of mechanical and Nuclear engineering Kansas State University Manhattan USA

Joule heating effects on a slit microcharmel filled with electrolytes are comprehensively investigated with emphasis on the thermal boundary conditions. An accurate analytical expression is proposed for the electrical field and the temperature distributions due to Joule heating are numerically obtained from the energy balance equation. The results show that a thermal design based on the average electric potential difference between electrodes can cause severe underestimation of Joule heating. In addition, the parame- tric study of thermal boundary conditions gives us an insight into the best cooling scenario for microfluidic devices. Other significant thermal characteristics, including Nusselt number, thermophoretic force, and entropy generation, are discussed as well. This study will provide useful information for the optimization of a bioMEMS device in relation to the thermal aspect.

关键词： microchannel electrolyte joule heating Nusselt number thermophoretic force entropy generation optimized thermaldesign

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Comparative numerical study of single and two-phase models of nanofluid heat transfer in wavy channel

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Applied Mathematics and Mechanics(English Edition) 2014年第7期35卷 831-848页

作者： M.M.RASHIDI A.HOSSEINI I.POP S.KUMAR N.FREIDOONIMEHR Department of mechanical engineering Faculty of EngineeringBu-Ali Sina UniversityHamedan 65178-38695 Iran Department of Mathematics Babe?Bolyai UniversityCluj-Napoca 400084Romania Department of Mathematics National Institute of TechnologyJamshedpur 831014Jharkhand India Young Researchers & Elite Club Hamedan BranchIslamic Azad UniversityHamedan 65181-15743 Iran

The main purpose of this study is to survey numerically comparison of two- phase and single phase of heat transfer and flow field of copper-water nanofluid in a wavy channel. The computational fluid dynamics （CFD） prediction is used for heat transfer and flow prediction of the single phase and three different two-phase models （mixture, volume of fluid （VOF）, and Eulerian）. The heat transfer coefficient, temperature, and velocity distributions are investigated. The results show that the differences between the temperature fie].d in the single phase and two-phase models are greater than those in the hydrodynamic tleld. Also, it is found that the heat transfer coefficient predicted by the single phase model is enhanced by increasing the volume fraction of nanoparticles for all Reynolds numbers; while for the two-phase models, when the Reynolds number is low, increasing the volume fraction of nanoparticles will enhance the heat transfer coefficient in the front and the middle of the wavy channel, but gradually decrease along the wavy channel.

关键词： nanofluid two-phase model wavy channel semi implicit method for pres-sure linked equation (SIMPLE) method

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Predictor homotopy analysis method for nanofluid flow through expanding or contracting gaps with permeable walls

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International Journal of Biomathematics 2015年第4期8卷 145-159页

作者： Navid Freidoonimehr Behnam Rostami Mohammad Mehdi Rashidi Young Researchers and Elite Club Hamedan Branch Islamic Azad University Hamedan Iran Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems4800 Cao An Rd. Jiadong Shanghai 201804 P. R. China ENN-Tongji Clean Energy Institute of Advanced Studies Shanghai P. R. China mechanical engineering departmentengineering faculty of bu-ali sina university hamedan Iran

In this paper a definitely new analytical technique, predictor homotopy analysis method (PHAM), is employed to solve the problem of two-dimensional nanofluid flow through expanding or contracting gaps with permeable walls. Moreover, comparison of the PHAM results with numerical results obtained by the shooting method coupled with a Runge–Kutta integration method as well as previously published study results demonstrates high accuracy for this technique. The fluid in the channel is water containing different nanoparticles: silver, copper, copper oxide, titanium oxide, and aluminum oxide. The effects of the nanoparticle volume fraction, Reynolds number, wall expansion ratio, and different types of nanoparticles on the flow are discussed.

关键词：流体流动问题纳米颗粒同伦分析预测器水墙差距龙格-库塔积分方法

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Fabrication and mechanical properties of MWCNTs-reinforced aluminum composites by hot extrusion

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Rare Metals 2012年第4期31卷 372-378页

作者： Mortazavi Majid Majzoobi G.H. Golikand A.Noozad Reihani A. Mortazavi S.Z. Gorji M.S. Department of mechanical engineering Faculty of EngineeringBu-Ali Sina UniversityHamedanIran Department of Materials engineering Monash UniversityClaytonVictoria 3800Australia Material Research School Tehran P.O.Box 31485-498Iran School of Materials engineering Najafabad BranchIslamic Azad UniversityIsfahanIran School of Materials and Mineral Resources engineering Universiti Sains MalaysiaPenangMalaysia

Over the past decade,the interest in aluminum composites reinforced with carbon nanotubes has grown *** have been carried out to overcome problems with uniform dispersion,interfacial bonding,void formation and carbide formation of the *** the present work,multi-wall carbon nanotubes(MWCNTs) aluminum composites were ***-energy ball milling with the aim at developing well-dispersed MWCNTs Al composites was followed by cold compaction,sintering,and hot extrusion at 500 ℃.Different amounts of stearic acid as processing control agent(PCA) is used in order to minimize cold welding of the Al particles,and to produce finer *** scanning calorimetry(DSC),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray diffraction(XRD) were employed to analyze the MWCNTs,the aluminum powder,and the composites’ microstructural *** hardness and tensile properties of the composites are also *** results showed 500% increase in yield stress after the addition of 1 wt% MWCNTs in Al-MWCNTs based *** ball-milling time of 4 h is found to be sufficient as excessive milling time destroys a vast number of MWCNTs.

关键词： aluminum matrix composite multi-wall carbon nanotubes(MWCNTs) ball milling mechanical properties

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粉末冶金Mg−B4C复合材料的准静态、动态力学性能及磨损行为

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Transactions of Nonferrous Metals Society of China 2021年第2期31卷 371-381页

作者： K.RAHMANI G.H.MAJZOOBI G.EBRAHIM-ZADEH M.KASHFI mechanical engineering Department Bu-Ali Sina UniversityHamedan 65174Iran Department of Soil Science Faculty of AgricultureGuilan UniversityRasht ***Iran mechanical engineering Department Ayatollah Boroujerdi UniversityBoroujerd ***Iran

制备体积分数分别为0、1.5%、3%、5%和10%B4C颗粒增强Mg金属基复合材料,研究其力学性能和磨损行为。在450℃和不同加载速率下,分别采用分离式霍普金森棒(SHB)、锻锤(DH)和Instron(QS)制备Mg−B4C样品,其应变速率分别为1600、800和0.008 ... 详细信息

制备体积分数分别为0、1.5%、3%、5%和10%B4C颗粒增强Mg金属基复合材料,研究其力学性能和磨损行为。在450℃和不同加载速率下,分别采用分离式霍普金森棒(SHB)、锻锤(DH)和Instron(QS)制备Mg−B4C样品,其应变速率分别为1600、800和0.008 s−1。研究Mg−B4C复合材料的显微硬度、准静态及动态抗压强度等力学性能和磨损性能。结果显示,SHB和DH样品的硬度分别比QS样品高20.2%和5.7%。SHB法制备的Mg−10.0%B4C样品的磨损率和磨损质量损失分别比QS样品的低33%和39%。与纯Mg相比,SHB、DH和QS制备的Mg−5.0%B4C样品的准静态抗压强度分别提高39%、30%和29%。此外,含B4C样品的动态抗压强度比准静态抗压强度提高51%~110%。

关键词：粉末压制高应变速率 Mg–B4C复合材料硬度力学性能磨损行为

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A numerical study for off-centered stagnation flow towards a rotating disc

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Propulsion and Power Research 2015年第3期4卷 169-178页

作者： M.Heydari G.B.Loghmani M.M.Rashidi S.M.Hosseini Department of Mathematics Yazd UniversityP.O.Box 89195-741YazdIran mechanical engineering Department Engineering Faculty of Bu-Ali Sina UniversityHamedanIran Department of Mathematics Khatam CenterIslamic Azad UniversityYazdIran

In this investigation,a semi-numerical method based on Bernstein polynomials for solving off-centered stagnation flow towards a rotating disc is *** method expands the desired solutions in terms of a set of Bernstein polynomials over a closed interval and then makes use of the tau method to determine the expansion coefficients to construct approximate *** method can satisfy boundary conditions at *** properties of Bernstein polynomials are presented and are utilized to reduce the solution of governing nonlinear equations and their associated boundary conditions to the solution of algebraic *** results are presented to investigate the influence of the rotation ratioαon the radial velocity,azimuthal velocity and the induced velocities.A comparative study with the previous results of viscous fluid flow in the literature is made.

关键词： Off-centered stagnation flow Similarity transform Bernstein polynomials Function approximation Tau method

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Torsional properties of cortical bone in longitudinal and transverse directions

Torsional properties of cortical bone in longitudinal and tr...

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International Conference on Osteoporosis and Bone Research 2008

作者： Mohsen Sadeghi-Mehr Ahmad Partovi-Miran mechanical engineering Department Engineering FacultyBu-ali Sina UniversityHamedanIran

＜正＞Objective:This study was conducted in order to investigate the effect of direction on the torsional properties of the cortical bone. Methods:Sixty femoral bovine bone specimens in transverse （n=30） and longitudinal （n=30） directions were prepared from the medial part of the flesh femoral shaft of 20 cows which were nearly at

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