ORCID Profile
0000-0002-4988-0753
Current Organisation
Isfahan University of Technology
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Publisher: Elsevier BV
Date: 04-2015
Publisher: No publisher found
Date: 2018
Publisher: Elsevier BV
Date: 07-2005
Publisher: Informa UK Limited
Date: 21-02-2018
Publisher: MDPI AG
Date: 27-07-2023
DOI: 10.3390/MET13081345
Abstract: The present research concerns fabrication of Al-4.3wt.%Cu metal syntactic foams using expanded perlite particles (EPPs). A gas pressure infiltration technique was employed to fabricate the aluminium syntactic foams under different infiltration temperatures and pressures. Ambient air pressure and 750 °C were identified as the favoured processing conditions for full infiltration of the melt. The average density and EP volume percentage of the fabricated foams were measured to be about 1.55 g/cm3 and 50.3%, respectively. Melt infiltration is believed to be mainly controlled by the breakage of the aluminium oxide layer on the melt surface and melt viscosity. Preferential infiltration of the melt between the mould wall and the EP particles bed complemented by radial melt infiltration toward the centre of the s les was identified. The effects of EP particles on growth of the nucleated primary α-aluminium phase were discussed. XRD and EDS analyses suggested some chemical reactions at the interface of EPPs with the molten aluminium. T6 heat treatment in the ambient atmosphere improved the average compressive tensile strength, plateau stress, and absorption capacity of the syntactic foams by more than 100%. Uniform deformation and similar densification strains (about 40%) of the as-fabricated and heat-treated syntactic foams during the compression test suggested uniform distribution of EP particles and metallic struts in the aluminium alloy matrix.
Publisher: Elsevier BV
Date: 04-2009
Publisher: Elsevier BV
Date: 08-2012
Publisher: Elsevier BV
Date: 09-2010
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 07-2017
Publisher: Springer Science and Business Media LLC
Date: 02-2010
Publisher: Elsevier BV
Date: 12-2009
Publisher: Elsevier BV
Date: 04-2014
Publisher: Elsevier BV
Date: 05-2009
Publisher: Springer Science and Business Media LLC
Date: 30-07-2014
Publisher: Springer Science and Business Media LLC
Date: 12-2012
Publisher: SAGE Publications
Date: 03-04-2017
Abstract: In this study, in situ aluminum matrix composites were synthesized through pyrolysis of high temperature vulcanization silicone in commercially pure aluminum melt. For this purpose, 1 to 4 wt% of high temperature vulcanization silicone was added to a vortex of molten aluminum at 750℃ and the resulting slurries were cast in steel dies. Microstructure, hardness, and tensile properties of the as-cast s les were examined at ambient and high temperatures. The results revealed the in situ formation and distribution of reinforcement particles in the matrix. Energy-dispersive X-ray analysis indicated that the formed reinforcement particles consisted of O and Si elements. This confirms the in situ reinforcement formation by pyrolysis of high temperature vulcanization silicone in the melt. The size of the in situ formed particles was mostly in the range of 200–2000 nm. It was shown that the composites synthesized by the addition of 4 wt% high temperature vulcanization had the highest mechanical properties both at ambient and high temperatures. Room temperature hardness, tensile strength, and yield strength of this s le were increased by about 50%, 23%, and 19% compared to the monolithic s le, respectively.
Publisher: Institute of Metals and Technology
Date: 14-12-2017
Publisher: Informa UK Limited
Date: 18-05-2016
Publisher: Elsevier BV
Date: 06-2011
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 12-2015
Publisher: MDPI AG
Date: 30-05-2022
DOI: 10.3390/MET12060945
Abstract: Phase Change Materials (PCMs) are materials that release or absorb sufficient latent heat at a constant temperature or a relatively narrow temperature range during their solid/liquid transformation to be used for heating or cooling purposes. Although the use of PCMs has increased significantly in recent years, their major applications are limited to Latent Heat Storage (LHS) applications, especially in solar energy systems and buildings. PCMs can be classified according to their composition, working temperature and application. Metallic PCMs appear to be the best alternative to salts and organic materials due to their high conductivity, high latent heat storage capacity and wide-ranging phase change temperature, i.e., melting temperature and chemical compatibility with their containers. This paper reviews the latest achievements in the field of low-melting point metallic PCMs (LMPM-PCMs), i.e., those with melting temperatures of less than 420 °C, based on Zn, Ga, Bi, In and Sn. Pure LMPM-PCMs, alloy LMPM-PCMs and Miscibility Gap Alloy (MGA) LMPM-PCMs are considered. Criteria for the selection of PCMs and their containers are evaluated. The physical properties and chemical stability of metallic PCMs, as well as their applications, are listed, and new application potentials are presented or suggested. In particular, the novel application of metallic PCMs in casting design is demonstrated and suggested.
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 09-2018
Publisher: Informa UK Limited
Date: 07-05-2015
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 05-2009
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 02-2012
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 09-2014
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 06-2011
Publisher: Elsevier BV
Date: 07-2006
Publisher: Springer Science and Business Media LLC
Date: 07-2017
Publisher: Elsevier BV
Date: 04-2009
Publisher: Wiley
Date: 11-09-2014
Publisher: Springer Science and Business Media LLC
Date: 22-09-2022
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 2011
Publisher: Trans Tech Publications, Ltd.
Date: 09-2016
DOI: 10.4028/WWW.SCIENTIFIC.NET/SSP.256.237
Abstract: In the present research, the possibility of single stage semi-solid casting of a hypereutectic gray cast iron in a sand mold was investigated. For this purpose, a specially designed chilled sprue sand mold rigged to a vertical centrifugal casting machine was used. The molten cast iron was poured in the chilled sprue sand mold at 1275 oC at a rotation speed of 400 rpm. Two control s les were also poured at 1275 oC under gravity and centrifugal casting conditions in the same mold without sprue chilling. Microstructures and mechanical properties of the specimens were then characterized. The results showed that the average length and thickness of the primary solid phase, i.e. the Kish graphite, and those of the eutectic flake graphite were smaller in semi-solid centrifuged castings and their hardness were higher than those of the control s les. The results are discussed in terms of the shearing and chilling effects of the designed sprue during the initial stages of pouring.
Publisher: Springer Science and Business Media LLC
Date: 02-2012
Publisher: Informa UK Limited
Date: 07-2011
Publisher: Elsevier BV
Date: 10-2013
Publisher: Springer Science and Business Media LLC
Date: 28-05-2010
Publisher: Elsevier BV
Date: 04-2011
Publisher: Wiley
Date: 25-01-2014
Publisher: Elsevier BV
Date: 04-2012
Publisher: Elsevier BV
Date: 06-2009
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 03-2010
Publisher: Elsevier BV
Date: 09-2010
Publisher: Springer Science and Business Media LLC
Date: 15-10-2014
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 05-2011
Publisher: Royal Botanic Garden Edinburgh
Date: 02-08-2017
DOI: 10.1017/S0960428617000233
Abstract: Leaf cuticle micromorphology has been cited as an important set of taxonomic characters in gymnosperms, but previous studies have largely been based on small s le sizes. The premise of this study was to understand whether external factors affect cuticular micromorphology of Podocarpaceae. Two ex le species, Prumnopitys andina and Podocarpus salignus, were studied. Of 21 s led characters, nine (c.43% of the total) were visually assessed as being moderately reliable or highly reliable for taxonomic discrimination for both species, with an additional six (c.29%) being moderately reliable or highly reliable for only one or other of the ex le species, and six characters (c.29%) unreliable for both. Seven of the most variable stomatal characters were selected for further analysis to establish whether environmental factors affect them. The relationship between these seven stomatal characters, the environment and climate was analysed using the R ‘vegan’ package and climate data gathered from WorldClim. Our results showed that both species had larger stomata in moist and shady conditions, and a higher density of (smaller) stomata in sunny and drier conditions. An additional novel finding was the presence of stomata on the adaxial leaf surface in 46% of s les of Prumnopitys andina: the first record of adaxial stomata in this species, highlighting the necessity of studying multiple s les of a given species. In conclusion, these results indicate that larger s le sizes than have hitherto been employed in cuticle micromorphological studies are necessary to fully document the amount of phenotypic variation that exists.
Publisher: World Scientific Pub Co Pte Lt
Date: 02-2016
DOI: 10.1142/S0218625X15500833
Abstract: Modification of solidification structures by applying electric current has been the subject of interest in recent years. However, the exact relationships between the dendrite growth parameters and the current density are not yet clear. The dendrite tip geometry is an important growth parameter which can be characterized using the dendrite tip radius and the universal litude coefficient. In this paper, the dendrite tip shape was investigated in the absence and presence of an electric field using a transparent model material, i.e. the succinonitrile–acetone alloy. The results showed that both dendrite tip radius and universal litude coefficient increased by increasing the applied current density. The increase in the tip radius was attributed to the Joule heat produced at the solid–liquid interface which reduced the interface undercooling. The increase in the universal litude coefficient was postulated to be due to the changes in the distribution coefficient of the alloy system which would result in higher solute concentration in front of the solid–liquid interface. Owing to the increased universal litude coefficient, more prominent dendritic fins were observed at dendrites tips under electric current.
Publisher: Trans Tech Publications, Ltd.
Date: 10-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/SSP.192-193.433
Abstract: The purpose of this study was to develop a new method for formation of non-dendritic microstructure during sand casting of aluminum alloys without any previous special processing. For this purpose, sand molds with three different types of running systems were designed. The first design included a traditional reverse tapered vertical sprue. The second design was similar to the first one except for a conical sand core placed inside the lower half portion of the sprue creating a narrow gap for the flow of the melt into the mold. In the third design, the core was fitted with metal chills. Molten A356 alloy was then cast from fully liquid state under gravity and centrifugal casting conditions in the molds and the microstructures of the castings were studied. The results showed that non-dendritic microstructure could be achieved by using the last design under low superheat temperature and centrifugal casting conditions. The findings can pave the way for small quantity production of semisolid castings in expendable molds.
Publisher: Elsevier BV
Date: 09-2011
Publisher: Springer Science and Business Media LLC
Date: 13-04-2013
Publisher: Trans Tech Publications, Ltd.
Date: 2019
DOI: 10.4028/WWW.SCIENTIFIC.NET/SSP.285.176
Abstract: Effects of SIMA processing on size and shape of primary solid particles of Cu34wt.%Zn2wt.%Pb brass alloy was investigated. The optimal temperature for semisolid processing of the alloy was found to be around 890 °C using Thermo-calc simulation software. Liquid fraction sensitivity of the alloy around this temperature is 0.012. The results indicated the formation of non-dendritic microstructure even after 1 min holding of 10% cold worked s le at 890 °C. Sphericity of the primary solid particles increased by increasing the cold working ratio and holding time. The smallest size (103 μm) and highest shape factor (0.84) of the primary solid particles were achieved at 30% cold working ratio and 5 min holding time.
Publisher: Elsevier BV
Date: 04-2011
Publisher: Elsevier BV
Date: 03-2011
Publisher: Springer Science and Business Media LLC
Date: 11-2016
Publisher: Informa UK Limited
Date: 11-2012
Publisher: Elsevier BV
Date: 05-2000
Publisher: Trans Tech Publications, Ltd.
Date: 09-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/SSP.217-218.83
Abstract: Morphological evolution of a transparent model succinonitrile (SCN) material during solidification was investigated in an apparatus resembling a shearing-disc viscometer. The in situ microscopic observations showed that fragmentation decreased the average particles size, but did not result in transition of dendritic to spherical morphology. At low shear rates, the degenerated dendrites and at high shear rates, the pseudo-cluster morphology was observed. It was revealed that coarsening has the most important effect on the final morphology of solid particles. The quantitative influences of shearing rate and intensity on the size and morphology of solid crystals were also discussed based on the measurements on the microstructures.
Publisher: Informa UK Limited
Date: 12-01-2014
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 07-2018
Publisher: Informa UK Limited
Date: 21-09-2017
Publisher: Elsevier BV
Date: 2016
Publisher: Springer Science and Business Media LLC
Date: 09-12-2014
Publisher: Elsevier BV
Date: 04-2014
Publisher: Springer Science and Business Media LLC
Date: 02-10-2008
Publisher: Springer Science and Business Media LLC
Date: 09-07-2014
Publisher: Springer Science and Business Media LLC
Date: 02-03-2016
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 2018
Publisher: Springer Science and Business Media LLC
Date: 29-09-2011
Publisher: Elsevier BV
Date: 2014
Publisher: Springer Science and Business Media LLC
Date: 21-05-2014
Publisher: Trans Tech Publications, Ltd.
Date: 2019
DOI: 10.4028/WWW.SCIENTIFIC.NET/SSP.285.247
Abstract: Semisolid casting and non-dendritic solidification of commercially pure tin (about 1 °C freezing range) and Zamak 3 alloy (about 10 °C freezing range) by a modified serpentine channel method were studied. It was shown that semisolid casting of very small freezing range metals with a non-dendritic structure was possible using this method. The results showed that the wall of the copper serpentine channel mold acted as a substrate for heterogeneous copious nucleation of primary solid particles and the channel provided sufficient self-steering action to disperse the nuclei in the melt. The average diameter and shape factor of the primary particles in the semisolid cast CP-Sn s le was measured to be about 107 μm and 0.75, respectively. The average diameter and shape factor of the primary particles in the semisolid cast Zamak 3 alloy was measured to be about 16 μm and 0.8, respectively. Hardness of semisolid s les was slightly higher than those of conventional gravity cast s les.
Publisher: Elsevier BV
Date: 04-2016
Location: Iran (Islamic Republic of)
No related grants have been discovered for Behzad Niroumand.