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Mechanical Properties of Al/BN Nanocomposites Fabricated by Planetary Ball Milling and Conventional Hot Extrusion

Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 245-253页

作者： Reza Gostariani ramin ebrahimi Mohsen Asadi Asadabad Mohammad Hossein Paydar Department of Materials Science and Engineering School of Engineering Shiraz University Materials and Nuclear Fuel Research School Nuclear Science and Technology Research InstituteTehran Iran

In this study,Al matrix nanocomposites containing 1,2 and 4 wt% nano-boron nitride were fabricated by mechanical milling and hot *** mechanical properties of all extruded samples were ***,the morphology and microstructure of the milled composite powders were characterized using two types of electron *** results showed that a high fraction of the boron nitride nanoparticles dissolved and formed a solid solution in Al matrix during the milling *** the process of solid solution formation,the work hardening rate of the composite powders *** led to a morphological change in the composite powders and resulted in equiaxed *** powder particle size also decreased after the milling *** increasing boron nitride content within a range of 0--4 wt% in the hot extruded samples,tensile stress increased from 212 to 333 *** hardness of the nanocomposite samples including 1,2 and 4 wt% boron nitride improved approximately 55,70 and 90% in comparison with pure Al,respectively.

关键词： Al/BN nanocomposite Planetary ball milling Hot extrusion Mechanical properties Microstructure

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Calculate Thermal Infrared Intensity of the Hull’s Military Ship

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Journal of Geographic Information System 2014年第4期6卷 317-329页

作者： ramin ebrahimi Laleh Nima Ghasemloo National Cartographic Center of Iran Tehran Iran Navigation Department ShenavariJvad-Alaaemeh College NEDSA Imam Hossin University Tehran Iran

Stealth technology emphasizes on the reduction in reflection and radiation energies, the surface of target's body in the range of visual, radar, thermal and near IR and so on. Providing solutions to reduce thermal IR intensity radiation is one of the appropriate actions in passive defense for identifying power and targeting enemy. Therefore, questions are brought up: How much is the thermal IR intensity radiation of surface of the hall’s vessel? How much is the effect of each parameter? This thesis tries to provide the software to answer these questions. The provided software measures thermal IR intensity radiation of the surface of the hall’s vessel by the material substance, the temperature of the surface of the hall’s vessel, the situation and characteristic of the thermal detector, noticing the coefficient of environment atmospheric transmittal. This software by changing the effective parameters on thermal IR radiation calculates the thermal radiation on thermal detector in different situations.

关键词： Intensity Radiation Thermal Infrared Thermal Detector Geometry’s Military Ship Neural

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Influence of growth conditions on the electrochemical synthesis of SnS thin films and their optical properties

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International Journal of Minerals,Metallurgy and Materials 2016年第3期23卷 348-357页

作者： Hosein Kafashan Farid Jamali-Sheini Reza ebrahimi-Kahrizsangi ramin Yousefi Advanced Materials Research Center Materials Engineering DepartmentNajafabad BranchIslamic Azad UniversityNajafabadIsfahanIran Department of Physics Ahvaz BranchIslamic Azad UniversityAhvazIran Department of Physics Masjed-Soleiman BranchIslamic Azad University(I.A.U)Masjed-SoleimanIran

Tin sulfide （SnS） thin films were prepared by electrodeposition onto fluorine-doped tin oxide （FTO） glass substrates using an aqueous solution containing SnCl2 and Na2S2O3 at various deposition potentials （L） and bath concentrations. The pH value and temperature of the solution were kept constant. The deposited films were characterized using X-ray diffraction （XRD）, field-emission scanning electron microscopy （FESEM）, photoluminescence （PL）, and ultraviolet-visible （UV-Vis） spectroscopy. The FESEM images demonstrated that changes in the deposition potential （E） and solution concentration led to marked changes in the morphology of the deposited SnS films. Energy-dispersive X-ray analysis （EDXA） results showed that the SrdS atomic ratio strongly depended on both the solution concentration and the deposition potential. To obtain an SrdS atomic ratio approximately equal to l, the optimal Sn2＋/S2O2- 3 molar ratio and E parameter were 1/8 and -1.0 V, respectively. The XRD patterns showed that the synthesized SnS was obviously polycrystalline, with an orthorhombic structure. The effects of the variations of bath concentration and deposition potential on the band-gap energy （Eg） were studied using PL and UV-Vis experiments. The PL spectra of all the SnS films contained two peaks in the visible region and one peak in the infrared （IR） region. The UV-Vis spectra showed that the optical band-gap energy varies from 1.21 to 1.44 eV.

关键词： tin sulfide thin films electrodeposition structural properties optical properties

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