OBJECTIVE The objective of this study was to investigate the applicability of micro-analytical methods with high spatial resolution to the characterization of the composition and corrosion behavior of two bracket systems. MATERIAL AND METHODS The surfaces of six nickel-free brackets and six nickel-containing brackets were examined for signs of corrosion and qualitative surface analysis using ...

The chief product of an analytical laboratory quality assurance (QA) program, ultimately, is confidenceconfidence that the analysis of any specimen sent to any laboratory participating in the program will be consistent, correct within tolerance, and interchangeable with equivalent analyses of related specimens performed by any other laboratory in the program. In order to maximize confidence, t...

Refractory-based high entropy alloys (HEAs) of the 2nd-generation type are new intensively-studied materials with a high potential for structural high-temperature applications. This paper presents investigation results on microstructural evolution and phase formation in as-cast and subsequently heat-treated HEAs at various temperature-time regimes. Microstructural examination was performed by m...

The Ni-based coatings with different content of spherical tungsten carbide were deposited by plasma transfer arc welding (PTAW) method on 304 austenitic stainless steel sheets in this study. The microstructure and wear property of spherical tungsten carbide particle reinforced composite coatings were investigated by means of optical microscope, scanning electron microscope (SEM), X-ray diffract...

Niobium (Nb) microalloying can improve the material properties of H13 steel (0.4C-5Cr-1.2Mo-1V steel), but it also affects natures primary carbides. Therefore, effect Nb content and cooling rate on behavior carbides in was studied this paper. The matrix structure obtained by chemical etching, then formation location identified electron probe microanalysis (EPMA). three-dimensional (3D) characte...

Abstract Glazed decoration in Iran from the Middle Elamite to Achaemenid periods includes world art milestones. With exception of Hasanlu IVB, for most sites, comprehensive chemical and mineralogical data are lacking, owing generally profound alteration vitreous material. To bridge information gap, enable reconstruct operation production chains a diachronic fashion, thirty-six glazed artefacts ...

The carbide characteristics of high vanadium high-speed steel (W3Mo4Cr5V6) manufactured by electroslag remelting (ESR) are analyzed field emission scanning electron microscopy (FESEM), probe microanalysis (EPMA) and micro-Vickers. results illustrate that three types carbides mainly formed in W3Mo4Cr5V6 which includes the lumpy strip-like MC intracrystalline, lamellar M2C at grain boundary with ...

Ferroelectric domain structure has been formed under the action of electron beam scanning in congruent lithium niobate single crystal covered by surface dielectric layer. The obtained types of the domain patterns have been considered as subsequent stages of domain structure evolution. The dependence on irradiated charge density of domain density, length, and period of domain rays and stripe dom...