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| 1 | Semi-hot Stamping as an Improved Process of Hot Stamping显示文摘Reducing the forming load,deletion of springback,increasing the formability of sheets as well as producing high strength parts are the main reasons to apply hot stamping process.Hot stamping process and 22MnB5 steels are the state of the art process and grades,respectively;however novel processes and steel grades are under considerations.In the current research,behavior of the steel grade MSW1200 blanks under semi and fully hot stamping processes was characterized.During semi-hot stamping process,the blank was firstly heated to a temperature of about 650℃ and then formed and quenched in the die assembly,simultaneously.Microstructure and mechanical properties of semi and fully hot stamped blanks were studied and the results were compared with those of normally water/air quenched blanks.The hot stamped blanks attained the strength values as high as water quenched blanks.The highest ductility and consequently,the best formability were achieved for the blank which had been semi-hot stamped.It was concluded that for the mentioned steel,semi-hot stamping process could be considered as an improved thermo-mechanical process which not only guaranteed a high formability,but also led to ultra high strength values. | Malek Naderi Mostafa Ketabchi Mahmoud Abbasi Wolfgang Bleck | 2011 | Journal of Materials Science & Technology2011，27，4： | 15 |
| 2 | 第二相粒径和振动对FSP制备AZ91/SiC表面复合层的影响显示文摘采用改进的搅拌摩擦加工方法(FSP)加工AZ91镁合金试样。这种新方法称为“振动搅拌摩擦加工方法(FSVP)”。SiC纳米颗粒作为第二相粒子,利用FSP和FSVP制备合金的表面复合层,研究不同粒径(30 nm和300 nm)的SiC强化颗粒对复合材料表面不同性能的影响。结果表明,采用FSVP工艺能细化材料的显微组织,提高材料的硬度、延展性和强度等力学性能。粒径为30 nm的增强颗粒对复合材料显微组织和力学性能的影响大于粒径为300 nm的增强颗粒。振动频率越高,FSV试样的力学性能和显微组织越好;当FSV振动频率为50和25 Hz时,搅拌区硬度值分别约为157和116 MPa。 | Behrouz BAGHERI Mahmoud ABBASI Amin ABDOLLAHZADEH Seyyed Ehsan MIRSALEHI | 2020 | Transactions of Nonferrous Metals Society of China2020，30，4： | 6 |
| 3 | 振动搅拌摩擦焊镁合金动态再结晶过程的模拟与实验研究显示文摘采用二维元胞自动机(CA)模型分析机械振动对AZ91合金在搅拌摩擦焊(FSW)过程中组织演变的影响。将模拟结果,即晶粒拓扑结构、粒度分布、平均晶粒度以及动态再结晶(DRX)分数与实测数据进行比较。结果显示,有限元分析结果与实验数据具有充分的相似性,CA方法可用于搅拌摩擦焊AZ91合金组织演变的分析。与FSW相比,振动搅拌摩擦焊(FSVW)处理的样品中位错密度更高,形核和晶粒长大也更快。对FSVW过程中不同振动频率下的晶粒度改变和DRX现象经过详细模拟后发现,振动使形核开始时间提前,随着振动频率的提高,孕育期和再结晶的比例降低。 | Mahmoud ABBASI Behrouz BAGHERI Farzaneh SHARIFI | 2021 | Transactions of Nonferrous Metals Society of China2021，31，9： | 4 |
| 4 | Microstructure and mechanical characteristics of AA6061-T6 joints produced by friction stir welding,friction stir vibration welding and tungsten inert gas welding:A comparative study显示文摘This study compared the microstructure and mechanical characteristics of AA6061-T6 joints produced using friction stir welding(FSW),friction stir vibration welding(FSVW),and tungsten inert gas welding(TIG).FSVW is a modified version of FSW wherein the joining specimens are vibrated normal to the welding line during FSW.The results indicated that the weld region grains for FSVW and FSW were equiaxed and were smaller than the grains for TIG.In addition,the weld region grains for FSVW were finer compared with those for FSW.Results also showed that the strength,hardness,and toughness values of the joints produced by FSVW were higher than those of the other joints produced by FSW and TIG.The vibration during FSW enhanced dynamic recrystallization,which led to the development of finer grains.The weld efficiency of FSVW was approximately 81%,whereas those of FSW and TIG were approximately 74%and 67%,respectively. | Behrouz Bagheri Mahmoud Abbasi Amin Abdollahzadeh | 2021 | International Journal of Minerals,Metallurgy and Materials2021，28，3： | 3 |
| 5 | Development of AZ91/SiC surface composite by FSP:effect of vibration and process parameters on microstructure and mechanical characteristics显示文摘A surface composite layer enhances the mechanical characteristics of a surface while retaining the properties of the base material.Friction stir processing(FSP)is a method for forming surface metal matrix composites(SMMCs)that reinforce a surface with particles.In the current study,a new method entitled friction stir vibration processing(FSVP)was applied to form SMMCs on the surface of AZ91 magnesium alloy with SiC particles as the reinforcing particles.Contrary to FSP,in FSVP,the workpiece was vibrated normal to the processing line while the tool rotated and traversed.The microstructure and mechanical properties of friction stir(FS)and friction stir vibration(FSV)processed specimens were evaluated.Additionally,the effects of vibration frequency and process parameters on different characteristics of FS and FSV processed specimens were studied.The results showed that the stir zone grains for FSV processed specimens were finer than those for FS processed specimens,and the second phase particles(SiC particles)had a more homogenous distribution in the former specimens than in the latter specimens.This was related to the effect of workpiece vibration during FSVP,which increased the material deformation and led to enhanced dynamic recrystallization and the breakdown of agglomerated SiC particles.The results indicated that the stir zone grain size decreased,and the distribution homogeneity of the SiC particles increased as vibration frequency increased.It was also observed that the stir zone grain size increased,and the mechanical properties of the processed specimens decreased as tool rotation speed increased. | Behrouz Bagheri Mahmoud Abbasi | 2020 | Advances in Manufacturing2020，8，1： | 3 |
| 6 | Electrospinning of Nylon-6,6 Solutions into Nanofibers: Rheology and Morphology Relationships显示文摘The relationship between the rheological properties of nylon-6,6 solutions and the morphology of their electrospun nanofibers was established. The viscosity of nylon-6,6 in formic acid(90%) was measured in the concentration range of 5 wt%-25 wt% using a programmable viscometer. Electrospinning of nylon-6,6 solutions was carried out under controlled parameters. The chemical structure, morphology and thermal properties of the obtained nanofibers were investigated using Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM) and differential scanning calorimetry(DSC), respectively. Entanglement concentration(ce) was found to be 15 wt% and a power law relationship between specific viscosity and solution concentration was observed with exponents of 2.0 and 3.3 for semi-dilute unentangled(c < ce) and semi-dilute entangled(c > ce) regimes, respectively. The diameter and uniformity of the nanofibers were found to be dependent on the viscosity. Moreover, the average diameter of electrospun nanofibers was found to be dependent on zero shear rate viscosity and normalized concentration(c/ce) in a power law relationship with exponents of 0.298 and 0.816, respectively. For nylon-6,6 solutions, the entanglement concentration(ce = 15 wt%) provides the threshold viscosity required for the formation of a stable polymeric jet during electrospinning and producing uniform beadless fibers. For concentrations less than ce, beaded fibers with some irregularities are formed. DSC analysis showed an increase in crystallinity of all electrospun samples compared to original polymer. Furthermore, Based on FTIR spectroscopy, α phase is dominant in electrospun nanofibers and minor amount of β and γ phases is also available. | Ali Abbasi Mohamed Mahmoud Nasef Matsuura Takeshi Reza Faridi-Majidi | 2014 | Chinese Journal of Polymer Science2014，32，6： | 2 |
| 7 | Antitumor Activity of PEGylated Nanoliposomes Containing Crocin inMice Bearing C26 Colon Carcinoma显示文摘 | Marziyeh Rastgoo Hossein Hosseinzadeh Hoda Alavizadeh Azam Abbasi Zahra Ayati Mahmoud Jaafari | 2013 | Planta Med2013，，06： | 1 |
| 8 | A uni- fied approach for the optimal PMU location for pow- er system state estimation显示文摘 | Abbasy Nabil H Ismail Hanafy Mahmoud | 2009 | IEEE Trans on Power Systems2009，24，2： | 1 |
| 9 | A unified approach for the optimal PMU locationfor power system state estimation 显示文摘 | Nabil H Abbasy Hanafy Mahmoud Ismail | 2009 | IEEE Transactions on Power Systems2009，24，2： | 1 |
| 10 | A comparative study between friction stir processing and friction stir vibration processing to develop magnesium surface nanocomposites显示文摘Friction stir processing(FSP)can be used to improve surface composites.In this study,a modified method of FSP called friction stir vibration processing(FSVP)was applied to develop a surface composite on AZ91 magnesium alloy.In this technique,the workpiece is vibrated normal to the processing direction.The results illustrated that compared with the FSP method,the FSVP caused a better homogeneous distribution of SiC particles in the microstructure.The results also showed that matrix grains of friction stir vibration processed(FSV-processed)samples((26.43±2.00)μm)were finer than those of friction stir processed(FS-processed)specimens((39.43±2.00)μm).The results indicated that the ultimate tensile strength(UTS)of FSV-processed specimens(361.82 MPa)was higher than that of FS-processed specimens(324.97 MPa).The higher plastic strain in the material during FSVP,due to workpiece vibration,resulted in higher dynamic recrystallization,and consequently,finer grains were developed.The elongation and formability index of the FSV-processed specimen(16.88%and 6107.52 MPa·%,respectively)were higher than those of the FS-processed sample(15.24%and 4952.54 MPa·%,respectively).Moreover,the effects of FSVP were also found to intensify as the vibration frequency increased. | Behrouz Bagheri Mahmoud Abbasi Amin Abdollahzadeh Amir Hossein Kokabi | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，8： | 1 |
| 11 | Investigation into wall wrinkling in deep drawing process of conical cups 显示文摘 | Mohammad Amin Shafaat Mahmoud Abbasi Mostafa Ketabchi | 2011 | Joumal of Materials Processing Technology2011，211，11： | 1 |
| 12 | Surface-Renewable AgNPs/CNT/rGO Nanocomposites as Bifunctional Impedimetric Sensors显示文摘In this study, glassy carbon electrode modified by silver nanoparticles/carbon nanotube/reduced graphene oxide(AgNPs/CNT/rGO) composite has been utilized as a platform to immobilize cis-dioxomolybdenum(VI)–salicylaldehydehistidine(MoO_2/Sal-His). The modified electrode shows two reversible redox couples for MoO_2/Sal-His. Electrocatalytic oxidation of cysteine(CySH) and electrocatalytic reduction of iodate on the surface of the modified electrode were investigated with cyclic voltammetry and electrochemical impedance spectroscopy methods. The presence of MoO_2/SalHis on AgNPs/CNT/rGO shifted the catalytic current of iodate reduction to a more positive potential and the catalytic current of cysteine oxidation to a more negative potential. The change of interfacial charge transfer resistance(R_(ct))recorded by the modified electrode was monitored for sensitive quantitative detection of CySH and iodate. Moreover, the sensor has a good stability, and it can be renewed easily and repeatedly through a mechanical or electrochemical process. | Azadeh Azadbakht Amir Reza Abbasi Zohreh Derikvand Ziba Karimi Mahmoud Roushani | 2017 | Nano-Micro Letters2017，9，1： | 0 |
| 13 | Biosynthesis of titanium dioxide nanoparticles using Hypericum perforatum and Origanum vulgare extracts and their main components,hypericin and carvacrol as promising antibacterial agents显示文摘OBJECTIVE:To evaluate the anti-bacterial activities of titanium dioxide(Ti O;)nanoparticles of Origanum(O.)vulgare and Hypericum(H.)perforatum extracts,carvacrol and hypericin against Staphylococcus(S.)aureus.METHODS:In this study,Ti O;nanoparticles of O.vulgare and H.perforatum extracts,carvacrol and hypericin,were prepared and their antibacterial effects were evaluated against Staphylococcus(S.)aureus.In this study,scanning electron microscope,fourier transform infrared spectrometer,atomic force microscopy,dynamic light scattering and zeta potential were used to investigate the structure of synthesized drugs.RESULTS:Anti-bacterial activity of synthesized NPs was tested by minimum inhibitory concentration(MIC),minimum bactericidal concentration and disc diffusion method.MICs of Ti O;-NPs synthesized using O.vulgare,H.perforatum,carvacrol and hypericin and Ti O;were obtained 250,62.5,250,and 250,and 500μg/m L,respectively.The MBCs for all of these were obtained 1000μg/m L.CONCLUSION:Green-synthesized of Ti O;nanoparticles provides a promising approach to the use of O.vulgare and H.perforatum,carvacrol and hypericin as novel agents and safer antibacterial compounds,especially anti-S.aureus compounds. | Mojtaba Khaksarian Mahmoud Bahmani Morovat Taherikalani Behnam Ashrafi Mahmoud Rafieian-Kopaei Naser Abbasi | 2022 | Journal of Traditional Chinese Medicine2022，42，2： | 0 |
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