|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 新型强塑性变形—静液循环挤压压缩加工AZ91镁合金及其表征显示文摘通过静液循环挤压压缩(HCEC)强塑性变形法加工具有较大高径比的密排六方金属棒,并研究其性能。对AZ91镁合金进行两个连续循环加工,研究其显微组织演化、力学性能和腐蚀行为。结果表明,HCEC加工可成功制备超细晶镁合金长棒材,且可同时提高其强度和韧性。经二次循环加工后,样品的抗拉强度和伸长率分别为铸态样品的2.46倍和3.8倍,显微硬度分布更加均匀,其平均值增加了116%。对于加工后的样品,从极化曲线得到的电位较高,电流较低,从Nyquist曲线得到的电容弧直径更大。有限元分析表明,与传统的循环挤压压缩相比,HCEC载荷与长度无关。HCEC是一种特殊的强塑性变形方法,可以制备兼具良好力学性能和耐腐蚀性能的超细晶镁合金长棒材。 | Armin SIAHSARANI Ghader FARAJI | 2021 | Transactions of Nonferrous Metals Society of China2021，31，5： | 11 |
| 2 | Microstructure and mechanical properties of Al/Cu/Mg laminated composite sheets produced by the ARB proces显示文摘In the present study, an Al/Cu/Mg multi-layered composite was produced by accumulative roll bonding(ARB) through seven passes, and its microstructure and mechanical properties were evaluated. The microstructure investigations show that plastic instability occurred in both the copper and magnesium reinforcements in the primary sandwich. In addition, a composite with a perfectly uniform distribution of copper and magnesium reinforcing layers was produced during the last pass. By increasing the number of ARB cycles, the microhardness of the layers including aluminum, copper, and magnesium was significantly increased. The ultimate tensile strength of the sandwich was enhanced continually and reached a maximum value of 355.5 MPa. This strength value was about 3.2, 2, and 2.1 times higher than the initial strength values for the aluminum, copper, and magnesium sheets, respectively. Investigation of tensile fracture surfaces during the ARB process indicated that the fracture mechanism changed to shear ductile at the seventh pass. | Davood Rahmatabadi Moslem Tayyebi Ramin Hashemi Ghader Faraji | 2018 | International Journal of Minerals,Metallurgy and Materials2018，25，5： | 10 |
| 3 | 新型SPD工艺对AM60镁合金性能不均匀性的影响显示文摘利用新型大塑性变形(SPD)技术提高镁合金的冶金性能。在此过程中,先进行循环挤压−压缩−角挤压(CECAP)过程,再在出口处进行挤压,起到附加背压的作用。因此,与等径角挤压(ECAP)相比,期望获得更加均匀和优异的力学性能。为了评价这种新方法的有效性和能力,对AM60镁合金进行加工。有限元分析表明,新方法的应变值和均匀应变分布均显著提高。此外,与传统的ECAP相比,新方法的压应力增加约110%。实验结果表明,经新工艺处理后,试样的硬度和强度均有显著提高,这是由于其晶粒细化,显微组织更加均匀,并且细化的β相沿晶界均匀分布。因此,该新工艺在未来镁合金生产中具有广阔的应用前景。 | Siroos AHMADI Vali ALIMIRZALOO Ghader FARAJI Ali DONIAVI | 2021 | Transactions of Nonferrous Metals Society of China2021，31，3： | 8 |
| 4 | Ag recovery from copper anode slime by acid leaching at atmospheric pressure to synthesize silver nanoparticles显示文摘In this paper, recovery of silver from anode slime of Sarcheshmeh copper complex in Iran and subsequent synthesis of silver nanoparticles from leaching solution is investigated. Sarcheshmeh anode slime is mainly consisted of Cu, Ag, Pb and Se. Amount of Ag in the considered anode slime was 5.4%(by weight).The goal was to recover as much as possible Ag from anode slime at atmospheric pressure to synthesize Ag nanoparticles. Therefore, acid leaching was used for this purpose. The anode slime was leached with sulfuric and nitric acid from room to 90 °C at different acid concentrations and the run which yielded the most recovery of Ag was selected for Ag nanoparticles synthesis. At this condition, Cu, Pb and Se are leached as well as Ag. To separate Ag from leach solution HCl was added and silver was precipitated as AgCl which were then dissolved by ammonia solution. The Ag nanoparticles are synthesized from this solution by chemical reduction method by aid of sodium borohydride in the presence of PVP and PEG as stabilizers. The synthesized Ag nanoparticles showed a peak of 394 nm in UV–vis spectrum and TEM images showed a rather uniform Ag nanoparticles of 12 nm. | Atefeh Khaleghi Sattar Ghader Dariush Afzali | 2014 | International Journal of Mining Science and Technology2014，24，2： | 7 |
| 5 | Recrystallization and mechanical properties of WE43 magnesium alloy processed via cyclic expansion extrusion显示文摘In this study, cyclic expansion extrusion(CEE), as a relatively new severe plastic deformation(SPD) process, is applied to a rare earth(RE) containing Mg alloy WE43. The effects of the processing temperature and the number of passes are also investigated. The results showed that dynamic recrystallization(DRX) occurred after CEE processing at 400°C, and a bimodal structure with ultrafine DRXed grains surrounded the unrecrystallized grains. However, the DRX at 330°C was retarded because of the existence of RE elements. The tensile tests showed that a simultaneous increase in the strength and the ductility of WE43 is obtained after CEE processing at 400°C via two passes. Furthermore, the highest ultimate tensile strength of 440 MPa was achieved after the second pass of CEE at 330°C, and the highest ductility of 21% was attained after the second pass of CEE at 400°C. The microhardness measurements showed that the hardness increased from HV 80 to HV 114 and HV 98 after two passes of CEE processing at 330 and 400°C, respectively. In conclusion, increasing the processing passes could increase the mechanical properties and the volume fraction of the recrystallized grains. Moreover, increasing the temperature reduced the strength and the microhardness even if the elongation increased. | Soheil Amani Ghader Faraji | 2018 | International Journal of Minerals,Metallurgy and Materials2018，25，6： | 7 |
| 6 | Correlation of Shear Viscosity of Nanofluids Using the Local Composition Theory显示文摘In this study,a new method is presented to correlate the shear viscosity of nanofluids by local composition theory.The Eyring theory and nonrandom two-liquid(NRTL)equation are used for this purpose.The effects of temperature and particle volume concentration on the viscosity are investigated.The adjustable parameters of NRTL equation are obtained by fitting with experimental data.The calculated shear viscosities for nanofluids of CuO/water with 29 nm particle size,Al2O3/water with two different particle diameters,36 nm and 47 nm,and CuO/(ethylene glycol,water)are compared with experimental data and the average absolute deviation(AAD)is 1.2%,while the results from some conventional models yield an AAD of 190%.The results of this study are in excellent agreement with experimental data. | M.S. Hosseini A. Mohebbi S Ghader | 2010 | Chinese Journal of Chemical Engineering2010，18，1： | 5 |
| 7 | 等通道转角挤压及后续热处理参数对半固态7075铝合金显微组织的影响(英文)显示文摘研究等通道转角挤压(ECAP)及后续加热到半固态温度对7075铝合金显微组织的影响。7075铝合金的显微组织受ECAP道次、ECAP路径、后续加热温度和保温时间等参数的影响。采用实验及Taguchi法探讨上述参数对7075铝合金的微观特性包括晶粒尺寸及形状因子的影响。结果表明:5道次ECAP、路径BA及后续630°C等温处理15 min是合金获得半固态显微组织的较佳工艺条件;加工路径和保温时间对晶粒尺寸的影响最大,而ECAP道次和加热温度对晶粒尺寸的影响最小。形状因子受加工路径、保温时间和加热温度的影响较大,而受ECAP道次的影响较小。 | Ramin MESHKABADI Ghader FARAJI Akbar JAVDANI Vahid POUYAFAR | 2016 | Transactions of Nonferrous Metals Society of China2016，26，12： | 4 |
| 8 | Ag/TiO_2/freeze-dried graphene nanocomposite as a high performance photocatalyst under visible light irradiation显示文摘Ag/TiO_2/freeze-dried graphene nanocomposites have been prepared via a facile one-step solvothermal method for the photocatalytic degradation of Rh B under visible light irradiation. During the solvothermal process, reduction of graphene oxide and loading of Ag/TiO_2 nanoparticles on graphene sheets were achieved. Investigation of chemical state of products showed that covering of Ag/TiO_2 surface with higher weight ratio of graphene resulting in that Ag metals in Ag/TiO_2 were oxidized to Ag2 O in nanocomposite structure after solvothermal process. Degree of photocatalytic activity enhancement strongly depends on the coverage of Ag/TiO_2 surface by porous graphene. The sample of 1 wt% porous graphene hybridized Ag/TiO_2 showed the highest photocatalytic activity, which is related to high migration efficiency of photoinduced of electrons and reduction of electron–hole recombination rate due to high electrical conductivity of graphene. Expanding of absorption to visible light region was ascribed to surface plasmon resonance effect of Ag metals and presence of graphene. Investigation of photocatalytic performance of formic acid as a dye-less organic pollutant showed that dye sensitization effect of Rh B molecules during evaluation of photocatalytic performance was negligible. | Ziaeddin Jafari Nader Mokhtarian Ghader Hosseinzadeh Mousa Farhadian Asghar Faghihi Farideh Shojaie | 2016 | Journal of Energy Chemistry2016，25，3： | 4 |
| 9 | STABILITY ANALYSIS OF A CAPACITIVE FGM MICRO-BEAM USING MODIFIED COUPLE STRESS THEORY显示文摘Based on the Modified Couple Stress Theory,a functionally graded micro-beam under electrostatic forces is studied.The FGM micro-beam is made of two materials and material properties vary continuously along the beam thickness according to a power-law.Dynamic and static pull-in voltages are obtained and it is shown that the static and dynamic pull-in voltages for some materials cannot be obtained using classic theories and components of couple stress must be taken into account.In addition,it is shown that the values of pull-in voltages depend on the variation through the thickness of the volume fractions of the two constituents. | Behrokh Abbasnejad Ghader Rezazadeh Rasool Shabani | 2013 | Acta Mechanica Solida Sinica2013，26，4： | 4 |
| 10 | Processing of AM60 magnesium alloy by hydrostatic cyclic expansion extrusion at elevated temperature as a new severe plastic deformation method显示文摘Hydrostatic cyclic expansion extrusion(HCEE) process at elevated temperatures is proposed as a method for processing less deformable materials such as magnesium and for producing long ultrafine-grained rods. In the HCEE process at elevated temperatures, high-pressure molten linear low-density polyethylene(LLDPE) was used as a fluid to eliminate frictional forces. To study the capability of the process,AM60 magnesium rods were processed and the properties were investigated. The mechanical properties were found to improve significantly after the HCEE process. The yield and ultimate strengths increased from initial values of 138 and 221 MPa to 212 and 317 MPa, respectively.Moreover, the elongation was enhanced due to the refined grains and the existence of high hydrostatic pressure. Furthermore, the microhardness was increased from HV 55.0 to HV 72.5. The microstructural analysis revealed that ultrafine-grained structure could be produced by the HCEE process. Moreover, the size of the particles decreased, and these particles thoroughly scattered between the grains. Finite element analysis showed that the HCEE was independent of the length of the sample, which makes the process suitable for industrial applications. | Farshad Samadpour Ghader Faraji Armin Siahsarani | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，5： | 4 |
| 11 | Preparation of transparent nanostructured N-doped TiO_2 thin films by combination of sonochemical and CVD methods with visible light photocatalytic activity显示文摘Pollution of water resources with pesticide compounds has raised serious environmental problems,and for photocatalytic degradation of these pollutants,thin film photocatalysts are preferred to colloidal ones due to the separation problem of colloidal nanoparticles.In this work,nanostructured TiO_2 and N-doped TiO_2 thin films with high transparency were deposited on glass and quartz substrates through sonochemical–chemical vapor deposition(CVD)method.The films prepared on glass and quartz substrates had nanocubic and nanospherical morphology,respectively.The presence of N atoms in the structure of TiO_2 resulted in a decrease in the band gap energy of TiO_2 and also in the reduction of photogenerated electron–hole recombination rate.Furthermore,the presence of N atoms induced the formation of Ti^(3+)species which can act as hole trapping centers.The prepared thin films were also used for the visible light photocatalytic degradation of paraoxon pesticide.According to these results among the prepared thin films,the N-doped TiO_2 thin films have higher photocatalytic activity than pure TiO_2 thin films.Moreover,in comparison with the thin films deposited on quartz substrate,the films on glass substrate have higher photocatalytic performance,which can be related to the special nanocubic morphology of these samples. | Hossein RASOULNEZHAD Ghader HOSSEINZADEH Reza HOSSEINZADEH Naser GHASEMIAN | 2018 | Journal of Advanced Ceramics2018，7，3： | 4 |
| 12 | Studying thin film damping in a micro-beam resonator based on non-classical theories显示文摘In this paper, a mathematical model is presented for studying thin film damping of the surrounding fluid in an in-plane oscillating micro-beam resonator. The proposed model for this study is made up of a clamped-clamped micro-beam bound between two fixed layers. The microgap between the micro-beam and fixed layers is filled with air. As classical theories are not properly capable of predicting the size dependence behaviors of the micro-beam,and also behavior of micro-scale fluid media, hence in the presented model, equation of motion governing longitudinal displacement of the micro-beam has been extracted based on non-local elasticity theory. Furthermore, the fluid field has been modeled based on micro-polar theory. These coupled equations have been simplified using Newton-Laplace and continuity equations. After transforming to non-dimensional form and linearizing, the equations have been discretized and solved simultaneously using a Galerkin-based reduced order model. Considering slip boundary conditions and applying a complex frequency approach, the equivalent damping ratio and quality factor of the micro-beam resonator have been obtained. The obtained values for the quality factor have been compared to those based on classical theories. We have shown that applying non-classical theories underestimate the values of the quality factor obtained based on classical theo-ries. The effects of geometrical parameters of the micro-beam and micro-scale fluid field on the quality factor of the resonator have also been investigated. | Mina Ghanbari Siamak Hossainpour Ghader Rezazadeh | 2016 | Acta Mechanica Sinica2016，32，3： | 3 |
| 13 | Morphology dependent photocatalytic activity of WO_3 nanostructures显示文摘The shape of nanostructure has important effects on their properties, therefore in this study, we have prepared and characterized three different morphologies of WO3 nanostructures i.e. nanorod, nanosphere and nanoplate for surveying shape effect on their photocatalytic properties toward degradation of Rhodamine B(Rh B) dye.Obtained results show that nanoplate WO3 in comparison with others has the best photocatalytic activity. According to SEM, and photocatalytic degradation results, the reason for this behavior is the sharp edges and corners of WO3 nanoplates. Because of their low coordination number, atoms located in the edges and corners of the WO3 nanoplates have more activity,adsorb more Rh B and therefore give more photocatalytic activity to the WO3 nanoplates. Using of different scavengers showed that hydroxyl radicals are mainly responsible for photocatalytic activity of WO3 nanoplates and nanospheres but for WO3 nanorods, superoxide radicals are the main photocatalytic degradation agents. | Mousa Farhadian Parvaneh Sangpour Ghader Hosseinzadeh | 2015 | Journal of Energy Chemistry2015，24，2： | 3 |
| 14 | THERMOELASTIC DAMPING IN A MICRO-BEAM RESONATOR TUNABLE WITH PIEZOELECTRIC LAYERS显示文摘In this paper,thermoelastic damping (TED) in a micro-beam resonator with a pair of piezoelectric layers bonded on its upper and lower surfaces is investigated.Equation of motion is derived and the thermoelasticity equation is governed using two dimensional non-Fourier heat conduction model based on continuum theory frame.Applying Galerkin discretization method and complex-frequency approach to solve the equations of coupled thermoelasticity,we study TED of a clamped-clamped micro-beam resonator.The presented results demonstrate that thickness of the piezoelectric layers and application of DC voltage to them can affect the TED ratio and the critical thickness value of the resonator. | Armin Saeedi Vahdat Ghader Rezazadeh Goodarz Ahmadi | 2012 | Acta Mechanica Solida Sinica2012，25，1： | 2 |
| 15 | ON THE STABILITY OF A FUNCTIONALLY GRADED RECTANGULAR MICRO-PLATE SUBJECTED TO HYDROSTATIC AND NONLINEAR ELECTROSTATIC PRESSURES显示文摘This article studies the stability of a functionally graded clamped-clamped micro-plate subjected to hydrostatic and electrostatic pressures. Equilibrium positions of the micro-plate are determined and shown in the state control space. To study the stability of the equilibrium positions, the motion trajectories are given for different initial conditions in the phase plane. Effects of the electrostatic and hydrostatic pressure changes on the deflection and stability of the micro-plate for some sample value of k are studied and values of the applied voltage and hydrostatic pressure leading system to unstable conditions by undergoing a saddle node and homoclinic bifurcations are determined. | Adel Nabian Ghader Rezazadeh Morteza Almassi Ali-Mohammad Borgheei | 2013 | Acta Mechanica Solida Sinica2013，26，2： | 2 |
| 16 | Parallel tubular channel angular pressing (PTCAP) as a new severe plastic deformation method for cylindrical tubes显示文摘 | Ghader Faraji Alireza Babaei Mahmoud Mosavi Mashhadi Karen Abrinia | 2012 | Materials Letters2012，，： | 2 |
| 17 | A model for temperature and particle volume fraction effect on nanofluid viscosity显示文摘 | Marziehsadat Hosseini Sattar Ghader | 2010 | Journal of Molecular Liquids2010，153，： | 1 |
| 18 | Synthesis of lanthanum carbonate nanoparticles via sonochemical method for preparation of lanthanum hydroxide and lanthanum oxide nanopartieles 显示文摘 | Masoud Salavati-Niasari Ghader Hosseinzadeh Fatemeh Davar | 2011 | Journal of Alloys and Compounds2011，509，10： | 1 |
| 19 | Numerical solution of particle size distribution equation:Rapid expansion of supercritical solution(RESS)process显示文摘The present study aimed to numerically simulate the rapid expansion of the supercritical solution(RESS)process including particle generation,hydrodynamics,and solving the population balance equation(PBE)to predict the particle-size distribution(PSD)of solid-supercritical carbon dioxide binary systems.Energy,momentum,and mass equations,in addition to the extended generalized Bender equation of state(EoS),were applied to predict the hydrodynamic behavior of a supercritical solution under several operating conditions using a nozzle and expansion vessel.The tetraphenylporphyrin(TBTPP)solubility in supercritical carbon dioxide was calculated using the Peng-Robinson EoS/Kwak-Mansoori as a mixing rule.Subsequently,TBTPP,aspirin,ibuprofen,and salicylic acid nucleation as well as the supersaturation rate were calculated.Finally,we solved the time dependence of the parameters of the size distribution numerically.The established models are compared over a wide parameter range using a reference model that refers to the method of moment log-normal size distribution functions through the RESS process to predict a solid PSD.The results obtained are presented with and without coagulation phenomena.The average absolute percent deviation of solubility of TBTPP was 3.98,and the hydrodynamic behavior of supercritical carbon dioxide showed a similar trend as the results presented in the published research work.Furthermore,a particle size distribution prediction using coagulation showed acceptable agreement with the experimental PSDs. | Hamidreza Bagheri Hassan Hashemipour Vahab Ghalandari Sattar Ghader | 2021 | Particuology2021，19，4： | 1 |
| 20 | EFFECT OF THE OPEN CRACK ON THE PULL-IN INSTABILITY OF AN ELECTROSTATICALLY ACTUATED MICRO-BEAM显示文摘In this paper, the effects of the open crack on the static and dynamic pull-in voltages of an electrostatically actuated fixed-fixed and cantilever micro-beam are investigated. By presenting a mathematical modeling, the governing static and dynamic equations are solved by SSLM and Galerkin-based Reduced Order Model, respectively. Then, each single-side open crack in the micro-beam is modeled by a massless rotational spring and the cracked mode shapes and corresponding natural frequencies are calculated by considering the boundary and patching conditions and using transfer matrix methods. Finally, the effects of the crack depth ratio, crack position and crack number on the pull-in voltage of the micro-beams are studied. It is shown that beside the residual stresses created in the machining process, the crack(s) can be initiated, growth and consequently change the pull-in voltage of the system by decreasing the natural frequencies. The results show that the crack position is effective beside the crack depth ratio in decreasing the pull-in voltage. Also it is shown that in the fixed-fixed micro-beam there are several points for the crack location in which, the pull-in voltage is extremum. | Asadollah Motallebi Mohammad Fathalilou Ghader Rezazadeh | 2012 | Acta Mechanica Solida Sinica2012，25，6： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员