Materials Literature
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Complex martensitic microstructure evolution in steels generates enormous curiosity among the materials scientists and especially among the Phase Field (PF) modeling enthusiasts. In the present work PF Microelasticity theory proposed by A.G. Khachaturyan coupled with plasticity is applied for modeling the Martensitic…
440A martensitic stainless steels which were modified with reduced carbon content(~0.5wt.%) and addition of small amount of vanadium, tungsten and molybdenum 0.4wt.%, 0.4wt.% and 0.68wt.% respectively were manufactured. Effects of alloying elements and tempering temperatures on the intergranular corrosion were investi…
To examine the effects of a two-cation ionic liquid as an electrolyte component of a supercapacitor, 1,4-bis(3-methylimidazolium-1-yl)butane tetrafluoroborate (MIBBF 4 ), dissolved in propylene carbonate (PC) or acetonitrile (ACN), is newly synthesized and tested here for potential use as an electrolyte of capacitor.…
The authors investigated the performance of ZnO nanowire-based metal–semiconductor field effect transistors (MESFETs) by focusing electron beam on the Schottky gate. The MESFET was fabricated by employing Tantalum as drain and source and by using Schottky barrier at tungsten–ZnO interface as the gate. As to IDS agains…
Hempflower-like Fe2O3 microspheres were synthesised by a simple method and its structure was determined by the scanning electron microscopy, X-ray diffraction patterns and Fourier transform infrared spectrum. The effect of reaction temperature and time on the formation and size of hempflower-like Fe2O3 microspheres wa…
Interface reactions between liquid aluminium and ZnO single crystal substrates of <1-100> orientation (at 1273 K under vacuum) were examined using scanning and transmission electron microscopy techniques. The substrates were subjected to the “pushing drop” tests when liquid is deposited from the capillary on the subst…
In this investigation, the effect of heat treatment parameters on the microstructure and impact energy as a measure of toughness of the austempered ductile cast iron (ADI) was studied. Yblocks were casted from ductile cast iron with following composition: 3.2% C, 2.5% Si, 1.09% Ni, 0.87% Cu, 0.5% Mo and 0.16%Mn. Charp…
The aim of this present paper is to compare the effects of conducting polymer, poly (3,4-ethylenedioxythiophene) nanotubes and carbon nanotubes, on the electro-optical properties of a nematic liquid crystal mixture (1770-2). From the optical transmission and capacitance behavior it has been proved that the conducting…
We present a study of the electronic properties of Tl5Te3, BiTl9Te6 and SbTl9Te6 compounds by means of density functional theory based calculations. The optimized lattice constants of the compounds are in good agreement with the experimental data. The band gap of BiTl9Te6 and SbTl9Te6 compounds are found to be equal t…
A Self-Consistent Mean Field (SCMF) kinetic theory including an explicit description ofthe vacancy diffusion mechanism is developed. The present theory goes beyond the usual local equi-librium hypothesis. It is applied to the study of the early time spinodal decomposition in alloys. Theresulting analytical expression…
Carbon nanotilaments (CNFs) could be synthesized on nickel catalyst layer-deposited silicon oxide substrate using $C_2H_2$ and $H_2$ as source gases under thermal chemical vapor deposition system. By the incorporation of $SF_6$ as a cyclic modulation manner, the geometries of carbon coils-related materials, such as na…
In order to predict microstructures during vacuum carburizing, the model which simulates not only the carbon(C) diffusion but also growth/dissolution of cementite(θ) is required. For development of a new model we applied vacuum carburizing to low alloy steels and analyzed the distribution of C and θ by GD-OES and imag…
The effect of the metallurgical state of austenite (undeformed vs. deformed vs. deformed + recrystallised) on the properties of the austenite to bainite transformation were investigated thanks to thermal (Gleeble simulations) and thermomechanical (hot torsion) treatments. No obvious influence of the state of austenite…
Nickel sulphide (NiS) can form inclusions in tempered glass which lead to fracture due to a phase transformation with a volume change of about 4%. A heat treatment, aiming to provoke this phase transformation, is currently used in industry to reduce this effect. In order to propose more efficient treatments, a complet…
Flexible composites with high performance are widely used in geotextiles and some other fields. In this research work, the author studied the tensile behaviors of four neat woven fabrics and two coated woven fabrics. The comparison of the tensile strength between the uncoated and coated woven fabric revealed the effec…
Experimental and numerical studies of fracture prediction with Czech steel no.41 2050 are presented. Seven ductile fracture criteria were calibrated, applied to simulation of rod cutting and bolt head trimming operation and compared with experimental results of these processes, obtained in semi-industrial conditions i…
The melting and axial compression of one (5, 5) single-walled boron nitride (BN) nanotube, as well as the (5, 5) BN tube embedded in one (10, 10) carbon nanotube, were simulated by molecular dynamics method. According to the calculated results, their differences in thermal-stability and compressive properties were dis…
Spontaneous self-assembling of interacting atoms prototyping crystallization and reconstructive phase transitions in crystalline state is discussed in terms of Atomic Density Function (ADF) theory. It is demonstrated that a multi-mode potential can reproduce any crystal structure. 3D computer modeling of formation of…
Resumen-El sector productivo actualmente se ha interesado en el estudio de fenomenologas que involucren mitigar el deterioro por corrosin de los materiales all empleados, como el desarrollo de nuevos materiales o la aplicacin de recubrimientos. En este trabajo se presenta el desarrollo de un nuevo tratamiento (Implant…
Alloy 15-5 PH is a stainless steel with 15 wt.% Cr and 5 wt.% Ni that is precipitation hardened by addition of Cu. In its semi-finished state, this alloy consists in Cu-supersaturated soft martensite; its high specific properties come from a final tempering consisting in a heating to 550-600°C, holding for 4 hours, an…