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Microstructural evolution of Al-20Si-5Fe alloy during rapid solidification and hot consolidation

Rare Metals 2009年第6期28卷 639-645页

作者： M.Rajabi M.Vahidi A.Simchi p.davami Department of Materials Science and Engineering Sharif University of Technology Institute for Nanoscience and Nanotechnology (INST) Sharif University of Technology

Al-20Si-5Fe melt was rapidly solidified into particles and ribbons and then consolidated to near full density by hot pressing at 400℃/250 Mpa/1 h. According to the eutectic-growth and dendritic-growth velocity models, the solidification front velocity and the amount of undercooling were estimated for the particles with different sizes. Values of 0.43-1.2 cm/s and 15-28 K were obtained. The secondary dendrite arm spacing revealed a cooling rate of 6 × 10^5 K/s for the particles with an average size of 20 μm. Solidification models for the ribbons yielded a cooling rate of 5 × 10^7 K/s. As a result of the higher cooling rate, the melt-spun ribbons exhibited considerable microstructural refinement and modification. The size of the primary silicon decreased from approximately 1μm to 30 nm while the formation of iron-containing intermetallic compounds was suppressed. Supersaturation of the aluminum matrix in an amount of-7 at.% Si was noticed from the XRD patterns During the hot consolidation process, coarsening of the primary silicon particles and precipitation of β-Al5FeSi phase were observed. Evaluation of the compressive strength and hardness of the alloy indicated an improvement in mechanical properties due to the microstructural modification.

关键词： Al-Si-Fe alloy rapid solidification cooling rate microstructure mechanical properties

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数值模拟铸件充型过程中的液/固两相流动

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铸造 2006年第4期55卷 373-377页

作者： R.Babaei N.Hatami K.Asgari N.Varahram p.davami SUTCAST铸造技术公司 Sharif工业大学材料科学与工程系伊朗德黑兰113659466

铸造过程中熔融金属内的固体渣粒的运动轨迹是非常重要的。文中给出了粒子传输轨迹的数学模型,该数学模型采用显示法来确定粒子的位置。模拟研究结果与用其它数学模型的模拟结果比较,吻合良好。该模型可用于固体粒子位置的确定,并应用到... 详细信息

铸造过程中熔融金属内的固体渣粒的运动轨迹是非常重要的。文中给出了粒子传输轨迹的数学模型,该数学模型采用显示法来确定粒子的位置。模拟研究结果与用其它数学模型的模拟结果比较,吻合良好。该模型可用于固体粒子位置的确定,并应用到SUTCAST软件中。

关键词：铸造数值模拟充型过程

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Numerical modeling and experimental validation of microstructure in gray cast iron

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International Journal of Minerals,Metallurgy and Materials 2012年第10期19卷 908-914页

作者： Masoud Jabbari parviz davami Naser Varahram Department of Mechanical Engineering Technical University of DenmarkKgs.Lyngby 2800Denmark Department of Materials Science and Engineering Sharif University of TechnologyTehran 11365Iran

To predict the amount of different phases in gray cast iron by a finite difference model （FDM） on the basis of cooling rate （R）, the volume fractions of total y phase, graphite, and cementite were calculated. The results of phase composition were evaluated to find a proper correlation with cooling rate. More trials were carried out to find a good correlation between the hardness and phase composition. New proposed formulas show that the hardness of gray cast iron decreases as the amount of graphite phase increases, and increases as the amount of cementite inereases. The,qe fnrrnulas are develoned to correlate the nhase volume fraction to hardness. The results are compared with exverimental data and show reasonable agreement.

关键词： cast iron cooling microstructure mechanical properties finite difference method

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Seroepidemiology of Toxoplasma infection in blood donors in Jahrom District,Southern Iran

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Asian pacific Journal of Tropical Biomedicine 2015年第12期5卷 1060-1064页

作者： Mohammad Hassan davami Morteza pourahmad Rasoul Baharlou Abdolreza Sotoodeh Jahromi Abbass Ahmadi Vasmejani Kavous Solhjoo Hamid Reza Fallah Mohsen Kalantari Zoonoses Research Center Faculty of Medicine Jahrom University of Medical Sciences Department of Internal Medicine Faculty of Medicine Jahrom University of Medical Sciences Department of Medical Microbiology Faculty of Medicine Jahrom University of Medical Sciences Jahrom University of Medical Sciences Research Centre for Health Sciences Shiraz University of Medical Sciences Department of Health Mamasani Higher Education Complex for Health Shiraz University of Medical Sciences

Objective:To identify the anti-Toxoplasma antibodies from blood donors who referred to blood transfusion bases of Jahrom County,using ELISA ***:Based on the prevalence and characteristics method,400 serum samples were collected from blood donors referred to Jahrom blood transfusion bases,Southern Iran,during 2010–2011,designed at testing by *** M and Ig G antibodies against Toxoplasma gondii were tested using ELISA kits(Dia-pro)on *** data were analysed by SpSS 19 ***:Review of 400 cases,54 of them were Ig G positive for parasites(13.5%)and 346of those with negative Ig G(86.5%).In Ig M examination,1.75%of them have been positive Ig M(7 cases)and 98.25%of them were Ig M negative(393 cases).By comparing the different group ages,40–50 year age group had the highest prevalence of Ig G positive(17.9%)and the age group of 30–40 years had the highest incidence of Ig M negative(2.5%).Conclusions:Due to the serological infection rate of toxoplasmosis obtained from this study,toxoplasmosis should be considered as a significant transfusion risk factor in Jahrom and also in any region with similar situations.

关键词： Toxoplasma Blood donors ELISA Iran

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