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microstructural Evolution during Partial Remelting of Al—Si Alloys Containing Different Amounts of magnesium

Journal of materials Science & Technology 2013年第10期29卷 971-978页

作者： A.Abedi m.shahmiri B.Amir Esgandari B.Nami Department of mechanical Engineering Shahid Rajaee Teacher Training University (SRTTU) School of metallurgy and materials Science Iran University of Science and Technology (IUST)

The effect of magnesium on the microstructures of A356 aluminum alloy in as-cast and semi-solid conditions was investigated. The result showed that magnesium refined the size of primary α（Al） phase and eutectic silicon. magnesium also modified considerably the eutectic silicon and decreased the size of globular α（Al） solid phase in the semi-solid processed alloy. Coarsening rate of the solid α（Al） phase during partial remelting at semi-solid temperature decreased by adding magnesium, probably due to the decrease of both the solid- liquid interfacial energy and inter-diffusion coefficient of solute atoms.

关键词： Al--Si alloys magnesium microstructure Semi-solid processing Coarsening

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microstructural evolution during semisolid state strain induced melt activation process of aluminum 7075 alloy

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Transactions of Nonferrous metals Society of China 2010年第9期20卷 1663-1671页

作者： A．BOLOURI m.shahmiri E．N．H．CHESHmEH Department of mechanical Engineering Eastern Mediterranean University Mersin 10 Turkey School of material Engineering and metallurgy Iran University of Science and Technology Tehran 16844 Iran

The effects of compression ratio on the microstructure evolution of semisolid 7075 Al alloy produced by the strain induced melt activation （SImA） process were investigated. The samples were cold deformed by compression into the different heights up to 40% reduction. The isothermal holding treatments were carried out at 625 ℃ for predetermined time intervals. The results reveal that the average grain size is gradually reduced with the increase of the compression ratio. When the compression ratio surpasses 30%, the above descending trend is not as evident as that below 30% reduction. During the subsequent heat treatments, the recrystallization is induced in the deformed samples by the increasingly accumulated strain energy. The grain growth mechanisms and the microstructural coarsening of the SImA processed 7075 Al alloy were discussed and confirmed.

关键词： thixoforming thermomechanical processing aluminium alloys semi-solid metal

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Effect of mg and semi solid processing on microstructure and impression creep properties of A356 alloy

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Transactions of Nonferrous metals Society of China 2013年第9期23卷 2518-2523页

作者： B.AmIR ESGANDARI B.NAmI m.shahmiri A.ABEDI School of metallurgy and materials Engineering Iran University of Science and Technology Department of mechanical Engineering Shahid Rajaee Teacher Training University

The effects of mg and semi solid processing on the creep properties ofA356 A1 alloy were investigated. The results show that the dislocation climb controlled creep is the dominant creep mechanism and it is not affected by the semi solid processing and further addition of mg. mg improves the alloy creep properties probably by forming large Chinese script mg2Si compounds at the interdendritic regions. The semi solid processed specimens exhibit better creep properties in comparison with the as cast ones. It is attributed to the reduction in the stacking fault energy resulting from the significant dissolution of mg in the a（A1） phase.

关键词： A356 alloy microstructure semi solid processing impression creep dislocation climb controlled creep

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The Effect of Polyvinyl Acetate Polymer on Reducing Dust in Arid and Semiarid Areas

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Open Journal of Ecology 2016年第4期6卷 176-183页

作者： Gholamreza Tadayonfar Narges shahmiri mohammad Hassan Bazoobandi Department of Civil Engineering University of Hakim Sabzevari Sabzevar Iran Department of Environmental management Environmental Organization Tehran Iran Faculty of Science Shahid Sherafat University of Farhangian Tehran Iran

Because the large areas of Iran are on arid and semiarid belt of the world, it has many problems due to windstorms. Wind storms cause dust and haze due to a mass of fine sand or silt soil elevated in the atmosphere. It makes heart disease-cardiovascular and respiratory and so is detrimental for the children. These have plagued the residents and so lives of them are disrupted every so often. In this research, the subject soil stabilization using adherence of poly vinyl acetate polymer as a way to reduce the production of dust is defined for prone area. In this paper, the effect of poly vinyl acetate polymer on silt soil has been studied. In this study the samples were uncompacted particles of soil with different amount of water-solvated polymer (0, 5, 10, 15, 20, 25, 30 grams per meter squared) poured over them. These samples are kept in experimental environment for 7 days. After ensuring complete dryness, their stabilities are tested against wind flow with 20 m/s speed. Results showed that adding more polymers to soil would considerably increase its particles’ stabilities. This stability is due to positive reaction of polymer with soil particles. The effect of this stability is maintained during sample drying time in the lab and the soil maintains its characteristics during testing. The best results are obtained for 20 grams polymer per meter squared, where caused an increase in stability to about 15 times that of the soil without polymer.

关键词： Haze Poly Vinyl Acetate Polymer Arid and Semi-Arid Area Stability against Wind

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