Chemical Pressure Effect on the Magnetic Order of the La1.4Sr1.6Mn2O7 Bilayered Manganite
In this Communication is it shown the role of Ca-doping in stabilizing the A-type AFM structure of the optimally doped La1.4Sr1.6Mn2O7 bilayered manganite.
Materials Literature
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Intense Fluorescence from Light-Driven Self-Assembled Aggregates of Nonionic Azobenzene Derivative
We describe here the highly fluorescent self-assembled spherical aggregates of an azobenzene molecule without a specific ionic component in organic solution under UV light illumination. The first stage of trans-to-cis photoisomerization by UV light at 365 nm was followed by a significant enhancement, up to about 1000…
The Structure and the Large Nonlinear Optical Properties of Li@Calix[4]pyrrole
A new compound with electride characteristics, Li@calix[4]pyrrole, is designed in theory. The Li atom in Li@calix[4]pyrrole is ionized to form a cation and an excess electron anion. Its structure with C(4v) symmetry resembles a cup-like shape. It may be a stable organic electride at room temperature. The first hyperpo…
Theoretical and Practical Considerations of Grain Refinement of Mg-Al Alloys
This DOI is not currently attached to any metadata records. DOIs can’t actually ever be deleted (they’re persistent), but sometimes our members create DOIs in error. We do have a process to approximate deletion which we follow only in rare cases where the DOI has been genuinely created in error, and most crucially, if…
Mechanical Properties and Creep Behavior of Mg–Al–Ca Alloys
This DOI is not currently attached to any metadata records. DOIs can’t actually ever be deleted (they’re persistent), but sometimes our members create DOIs in error. We do have a process to approximate deletion which we follow only in rare cases where the DOI has been genuinely created in error, and most crucially, if…
Metal Quality - From Ingot to Finished Product
Optimum performance of metal in the die casting shop in terms of metal loss, sludge generation, and high quality and consistency in mechanical properties of the die cast components are becoming increasingly important. In this context metal quality both from alloy producers’, die casters’ and end users’ perspectives is…
Residual Stresses in Bulk Metallic Glasses due to Thermal Tempering
Bulk metallic glasses (BMGs) are attractive structural materials that develop residual stresses during processing due to thermal tempering. In this process, compressive surface stresses are generated within thin layers balanced with tension in the interior. In the present study, stress generation was analyzed experime…
The Effect of RE and Ca on Corrosion Resistance of AZ91
The effects of RE and Ca on the mechanical properties and corrosion behavior of AZ91 have been studied by Zwick electronic universal material testing machine, X-ray diffraction, corrosion test and polarization experiment. The results showed that the addition of RE and Ca could improve the mechanical properties and cor…
Effect of Al<sub>2</sub>O<sub>3</sub> Thin Film on Corrosion Resistance of Pure Mg and Its Anodic Coating
Al2O3 thin film was formed on pure magnesium and its anodic coating by sol-gel method. SEM observation and EDX analysis showed that Al2O3 film could not totally cover the surface of base metal, but they blocked small pores when they were formed on anodic coating. Potentiodynamic polarization test indicated that Al2O3…
The Influence of Twinning on the Hot Working Flow Stress and Microstructural Evolution of Magnesium Alloy AZ31
The microstructural evolution during compression (at 350°C and a strain rate of 0.01s-1) was examined for magnesium alloy AZ31 received in the "as-cast" condition. It was revealed that at low strains, many twins are produced and dynamically recrystallized (DRX) grains form as a necklace along pre-existing grain bounda…
Electrochemical Behavior of Magnesium and Aluminium Ions in Alkali Chloride Melt
The electrodeposition of aluminium and magnesium in lithium chloride-sodium chloride (mass 5:1) melt at 700°C has been studied using cyclic voltammetry, square wave voltammetry and chronopotentiometry. The reduction of aluminium and magnesium ions on tungsten electrode are both reversible processes, with three and two…
Microstructure Refinement of Magnesium Based Alloy
Additions of grain refiners based on Ca, Ca/Si, Al3Ti and Al4C3 to pure magnesium and AZ31 alloy result in remarkable microstructure refinement. With proper amount of these refiners addition, the grain size in as-cast ingots is one order of magnitude lower than that without refiner addition. Small amount of refiner ad…
Microstructure and Fracture Surfaces of Carbon Nanotubes/Magnesium Matrix Composite
Using carbon nanotubes (CNTs) as reinforced phase, it was made to carbon nanotubes/Magnesium matrix composite by the foundry method in Argon gas protection. The experiment results show that CNTs can strengthen the mechanical properties of the CNTs/Magnesium matrix composite, and tensile strength and elongation ratio a…
Semiflexible grafted polymers in poor solvents: Toroidal, archway, and tower micelles
We study a system of grafted semiflexible polymers in a poor solvent which form toroidal or rodlike conformations in the bulk. However, because of the physical constraint of surface grafting, macrophase separation is inhibited and a number of different polymer aggregates (or micelles) form which can be related to the…
Two-Dimensional X-Ray Diffraction for Structure and Stress Analysis
This paper introduces the recent progress in two-dimensional X-ray diffraction as well as its applications in microstructure and residual stress analysis. Based on the matrix transformation between diffraction space, detector space and sample space, the unit vector of the diffraction vector can be expressed in the sam…
Photoluminescence of highly porous nanostructured Si-based thin films deposited by pulsed laser ablation
Nanostructured, Si-based cottonlike, highly porous thin films of Si, SiNx, and SiOx were deposited by the excimer laser ablation of Si targets in He, He∕N2, and He∕O2 ambients, respectively. Photoluminescence (PL), x-ray photoelectron spectroscopy, and photoacoustic Fourier transform IR have been used to characterize…
Observation of two-wave coupling during the formation of POLICRYPS diffraction gratings
We report on the experimental observation of two-wave mixing that occurs inside a sample between the beams used for the fabrication of polymer-liquid-crystal-polymer slices (POLICRYPS) diffraction gratings. The effect depends on the phase shift between the curing interference pattern and the grating being cured. This…
Production of Magnesium Metal from Turkish Calcined Dolomite Using Vacuum Silicothermic Reduction Method
In the present study, the production of magnesium metal from Turkish calcined dolomite containing 43.20 % MgO and 47.46 % CaO via Pidgeon process was studied under the pressure of 1 mbar. In the experiments, Turkish ferrosilicon containing 75 % Si and 24 % Fe was used as reducing agent. Effects of FeSi addition (90-15…
Mechanical Properties and Creep Behavior of Mg–Al–Ca Alloys
This paper investigates the microstructure, mechanical properties and creep behavior of Mg–Al–Ca alloys with different Ca content. SEM and EDAX analyses show that the dominant second phase in the as-cast Mg–Al–Ca alloys is Al2Ca, which distributes at the grain boundaries and disperses in the grain interior as well. Bo…
Thermally Supported Mechanical Joining of Magnesium Components
In modern car concepts the aspect of lightweight constructions becomes more and more important. Lightweight materials, as aluminum and magnesium, get in the spotlight, thereby. Particularly because of the enormous potential for lightweight constructions industrial interests in magnesium wrought- and casting materials…