Materials Literature
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The low density of magnesium alloys makes them attractive for lightweight constructions. However, creep remains an important limitation of Mg alloys. To gain a more detailed understanding of the correlation between microstructure and creep properties in Mg alloys, creep tests have been performed on MRI 230D samples fe…
State-of-the-art focused ion beam (FIB) instruments have an ion column for sample modification and an electron column for scanning electron microscopy (SEM). 3D reconstruction of a sample volume can be achieved by serial sectioning using the FIB in combination with high-resolution SEM imaging of each cross-section. Us…
Specimens of 2507 super-duplex stainless steel aging at 850°C for 5 min, 15 min and 60 min were investigated to evaluate the pitting corrosion resistance in 3.5% NaCl solution at 30°C and 50°C. The results are correlated with the microstructures obtained with different aging time. The precipitation of σ phase remarkab…
Mg of purity 99.8 wt% was deformed by High Pressure-Torsion at hydrostatic pressures 1 to 4 GPa and RT, up to plastic shear strains of 120. X-ray texture analysis showed up deviations from expected shear texture, which increased with increasing shear strain and hydrostatic pressure. According to TEM and SEM investigat…
Information about truck movements on our transportation system is important for understanding and supporting freight mobility. Unfortunately, there is relatively little information available on how different land uses generate truck trips. Such information is necessary as input into travel forecasting models as well a…
This paper proposes a ferrite left handed coplanar waveguide (LH CPW) phase shifter that makes no use of any active element. The ferrite substrate was designed to be biased by an external DC magnetic causing the ferrite substrate to be magnetized in the same direction as the applied DC magnetic bias. A horizontal DC m…
Statistics of acoustic emission accompanying plastic deformation and of stress serrations caused by the Portevin-Le Chatelier effect are studied during tension of an Al3%Mg alloy at room temperature. Power-law distributions of acoustic emission reflecting self-organization of dislocations and intermittency of plastic…
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
Basic regularities of the anodic dissolution and cathodic behavior of iron family silicides in acidic and alkaline electrolytes are considered. The effect of external and internal factors on the mechanism and kinetics of the anodic process is studied using a combination of electrochemical, analytical, and structural m…
Direct brazing is a well-known technique for joining ceramics either themselves or to metals, whereby the required costly active filler alloys are considered a handicap of this process. In this work the indirect brazing of zirconia to zirconia mechanically metallized with Ti was successfully achieved using conventiona…
The display of digitized PD pulses with respect to the power frequency AC cycle has been widely applied both in the laboratory measurement of PD, as well as within industrial PD measurement systems on equipment such as cables, transformers and rotating machines. Theory shows that PD will occur with a specific polarity…
Transparent polyethylene terephthalate (PET) substrates were coated with SiO 2 and ZrO 2 using thermionic vacuum arc (TVA) method for the first time. The melting point of PET is approximately 260°C. Transmittances, thickness, reflectance, and refractive indices of coated PET samples were measured by ultraviolet—visibl…
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
The mechanical behavior of a coarse-grained (100 μm) nickel-base alloy nichrome (Ni-20%Cr) was studied in compression at temperatures ranging from 150 to 1000°C. It was shown that in the temperature interval of 300-600°C this alloy demonstrates the following features of mechanical behavior: i) positive temperature dep…
The mechanical behavior of twinned silicon carbide (SiC) nanowires under combined tension-torsion and compression-torsion is investigated using molecular dynamics simulations with an empirical potential. The simulation results show that both the tensile failure stress and buckling stress decrease under combined tensio…
Gold nanoparticles have a high catalytic activity for CO oxidation at low temperatures providing they remain less than 5nm in diameter. Their structure and stability and the growth processes that occur during heating have been investigated using Angstrom resolution in-situ double aberration corrected transmission elec…
The submelt millisecond annealing process was introduced in the context of complementary metal-oxide semiconductor technology downscaling to enhance the activation of dopants. However, circuit designs can produce nonuniform local radiative and thermal dispersion properties at the front side of a wafer. Nonuniformities…
This paper constitutes a review of the literature over the recent ten-year period in the field of application of silver as a component of polymeric nanocomposites. The methods of preparation of silver nanoparticles as well as their properties have been presented. The synthesis of polymer/Ag nanocomposites, the role pl…
The study presents synthesis of vinyl alcohol and L-aspartic acid copolymers (PVA-co-Asp), by solution polycondensation procedure using manganese acetate as a catalyst. Two copolymers were obtained with molar ratio of poly(vinyl alcohol) (PVA) structural unit to aspartic acid equal to 10/0.5 and 10/1, respectively. PV…