Author
Ahmad Ali Amadeh
Other affiliations: University College of Engineering
Bio: Ahmad Ali Amadeh is an academic researcher from University of Tehran. The author has contributed to research in topics: Microstructure & Corrosion. The author has an hindex of 24, co-authored 85 publications receiving 1902 citations. Previous affiliations of Ahmad Ali Amadeh include University College of Engineering.
Topics: Microstructure, Corrosion, Coating, Indentation hardness, Intermetallic
Papers published on a yearly basis
Papers
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TL;DR: In this article, the effects of various FSW parameters such as tool traverse speed, plunge depth, tilt angle and tool pin geometry on the formation of intermetallic compounds (IMCs), tunnel formation and tensile strength of joints were investigated.
196 citations
TL;DR: In this paper, the effect of current density on the grain size of electrodeposited nickel coatings was investigated by using X-ray diffraction analysis and modified Williamson-Hall relation.
Abstract: The aim of this work was to investigate the effect of current density on the grain size of electrodeposited nickel coatings. For this purpose, nanocrystalline nickel coatings were deposited from a Watts bath containing 5 g/l sodium saccharin as an additive, by direct current electroplating at different current densities. X-ray diffraction analysis and modified Williamson–Hall relation were used to determine the average grains size of the coatings. The experimental results showed that the coating grains size decreased sharply by increasing the current density from 10 mA/cm 2 to 75 mA/cm 2 . Nanocrystalline nickel coating with average grain size smaller than 30 nm can be achieved at the current densities higher than 50 mA/cm 2 . Furthermore, a general and simple theoretical model based on atomistic theory of electrocrystallization has been made in order to find out the relationship between the grain size and current density. According to this model the variation of log (d) versus log (i) was linear which is in accordance with experimental results for the current densities lower than 75 mA/cm 2 .
147 citations
TL;DR: In this paper, three weld overlay alloys including Inconel 625, Stellite 6 and stellite 21 were deposited on H11 steel substrates using tungsten inert gas welding.
129 citations
TL;DR: In this article, the effect of saccharin addition and bath temperature on the average grain size of nanocrystalline nickel coating was investigated by XRD technique and a theoretical formula was established for the temperature dependence of the grain size.
Abstract: Nanocrystalline nickel coating was synthesized by direct current electrodeposition from a Watts bath at the current density of 100 mA/cm 2 and pH = 4. The effect of saccharin addition (0–10 g/l) and bath temperature (45–65 °C) on the average grain size of the deposits was investigated by XRD technique. The results showed that the average grain size decreased from 426 nm to 25 nm as the saccharin concentration increased from 0 to 3 g/l, while further increase in saccharin concentration had no significant effect. Theoretical model also indicated a non-linear function for dependence of grain size on saccharin concentration, which was in accordance with experimental results. The experimental results showed that the increases in the bath temperature had no considerable effect on the average grain size of the deposits. A theoretical formula was also established for the temperature dependence of the grain size.
124 citations
TL;DR: In this paper, the effect of bath temperature, current density, and saccharin addition on grain size and texture coefficient (TC= I (200) / I (111) ) was investigated by X-ray diffraction (XRD).
109 citations
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TL;DR: In this article, a comprehensive understanding of the fundamentals of the microstructural evolution during FSW/P has been developed, including the mechanisms underlying the development of grain structures and textures, phases, phase transformations and precipitation.
390 citations
TL;DR: In this article, a trace amount of residual water (H2O) derived from the decomposition reaction of LiPF6 with H2O is reduced during the initial Li deposition process to form a uniform and dense LiF-rich solid electrolyte interphase (SEI) layer on the surface of the substrate.
266 citations
TL;DR: In this paper, the electrodeposition process, effective parameters, properties, and application of Ni-Fe were summarized considering the previous studies, as the evaluation of previous researches will be valuable to guide future researches.
244 citations
TL;DR: It was found that the kinetics of cobalt leaching is controlled by surface chemical reaction at temperatures lower than 45°C, however, diffusion through the product layer at temperatures higher than45°C controls the rate of cobALT leaching.
213 citations
TL;DR: In this article, the recent developments in the field of hot dip zinc coating are reviewed with special reference to different industrial applications and the improvements in physical and chemical structural composition due to pre- and post-modification processes are discussed.
Abstract: The recent developments in the field of hot dip zinc coating are reviewed with special reference to different industrial applications. The improvements in physical and chemical structural composition due to pre- and post-modification processes are discussed. The present review has the focus mainly on the readership of young researchers engaged in this field. Very recent developments on the hot dip galvanization processes are highlighted. Their industrial competencies with aluminium dipping are also briefly discussed. The scopes for immediate future developments are also highlighted then and there.
195 citations