Showing papers in "Journal of Alloys and Compounds in 2014"

TL;DR: In this paper, a comprehensive study of densification behavior, microstructural features, microhardness, wear performance and high-temperature oxidation properties of Inconel 718 parts fabricated by selective laser melting (SLM), a typical additive manufacturing process was established.

TL;DR: In this paper, the authors used optical and SEM micrographs to show the observed grain structure in the SLM fabricated and Hot Isostatically Pressed (HIPped) material and found that the repeating pattern shown in the grain structure has been linked to the overlapping of the "island" pattern used as standard in the Concept Laser M2 powder-bed facility.

TL;DR: In this article, the evolution of structure with temperature can be classified into four types: Al0−Al0.3, FCC structure; Al0.5−Al 0.7, mixed structure; and spinodal A2+B2 structure.

TL;DR: In this article, the microstructure and mechanical properties of equimolar composition alloys were studied in as-solidified and annealed conditions, and it was shown that poor compatibility of V with other alloying elements caused significant distortions of FCC solid solution and thus promoted formation of the σ phase.

TL;DR: Selective laser melting of Ti6Al4V alloy for biomedical applications: Temperature monitoring and microstructural evolution as discussed by the authors, which can be used for both temperature and structural evolution.

TL;DR: In this paper, the evolution of microstructure and texture after heavy cold rolling and subsequent annealing in a wide temperature range was first studied in an equiatomic CoCrFeMnNi high-entropy alloy (HEA).

TL;DR: In this article, the studied composites were produced by mechanical alloying (MA) and employed milling times were of 1, 3 and 5h. The hardness behavior in composites was evaluated with a Vickers micro-hardness test.

TL;DR: In this paper, four types of refractory HEAs were designed and synthesized, including NbCrMoTiAl 0.5 (H-Ti), NbMoVAl0.5(H-V) and NbcrMoTiVAl 0.5Si 0.3 (H -TiVSi0.3).

TL;DR: In this paper, different expressions for estimating the tensile and fracture properties of metallic alloys by means of the small punch test were proposed and their applicability was assessed after experimental testing a wide range of metallic materials and the application of a numerical model developed to study the effect of specimen thickness on these proposals.

TL;DR: In this paper, a two-layer heterogeneous model consisting of semiconducting grains separated by insulating grain boundaries was able to account for the observed temperature and frequency dependent electrical properties in CFGO ceramics.

TL;DR: In this article, a novel technique, plasma milling (P-milling), is proposed to solve the two problems simultaneously, namely the reversible formation of Mg(In) solid solution and the catalyzing effect of in situ synthesized MgF2.

TL;DR: In this article, structural and photoluminescence properties of annealing dependent and gas and metal ion implanted zinc oxide (ZnO) single crystals were studied under high vacuum or oxygen at 650°C and their effects were studied.

TL;DR: In this paper, the thermal stability studies carried out in the temperature range of 400-600°C for duration of 2-10h in Ar atmosphere suggest that these alloys exhibit excellent thermal stability in terms of phases and crystallite size.

TL;DR: In this paper, a composite reinforced with hybrid (GNPs and CNTs) reinforcement exhibited higher failure strain than those reinforced with individual GNPs and multi-walled carbon nanotubes (MW-CNTs).

TL;DR: In this paper, a dissolution-precipitation mechanism was proposed for describing the formation and growth of pure-phase orthorhombic RFeO3 (RFEO3).

TL;DR: An equiatomic CoCrFeNiAl high-entropy alloy was synthesized by mechanical alloying, and phase evolutions, microstructure, thermal properties and annealing behaviors were investigated as discussed by the authors.

TL;DR: In this article, the green upconverted fluorescence intensity ratio (FIR) between the two thermally coupled levels (2 H 11/2 and 4 S 3/2 ) was measured for the purpose of optical thermometry.

TL;DR: A facile and efficient one-step hydrothermal approach has been developed to synthesize chemically bonded TiO2/reduced graphene oxide (RGO) nanocomposites with Ti(SO4)2 and graphene oxide as precursors and ethanol/water solvent as a reducing agent as discussed by the authors.

TL;DR: In this paper, the effect of heat treatment on electrochemical properties of copper sulfide (CuS) electrodes were examined by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge tests.

TL;DR: In this article, a powder metallurgy route consisting of high energy ball milling, hot isostatic pressing (HIP) and extrusion has proved a highly effective process for achieving a homogeneous distribution of particles with minimal clustering of the nanoparticles, at an industrially relevant scale.

TL;DR: In this paper, a short wavelength upconversion luminescence of Ho3+ was investigated for temperature sensing with fluorescence intensity ratio (FIR) technique in Yb3+/Ho3+ co-doped β-NaLuF4 hexagonal microprisms synthesized by hydrothermal method.

TL;DR: In this paper, uniform α- and β-Bi 2 O 3 hollow microspheres were successfully synthesized through a facile template-free solvothermal method followed by calcination of the precursor.

TL;DR: In this article, the free-corrosion current density of Al 2 CrFeNiCoCuTi x high-entropy alloy coatings is reduced by 1-2 orders of magnitude.

TL;DR: In this article, first principles calculations based on density functional theory (DFT) were adopted to investigate the stability, elastic constants, hardness, Debye temperature and mechanical anisotropy properties of Y-C binary compounds.

TL;DR: In this article, the AlCoCrCuFeNi high-entropy alloy (HEA) was fabricated on pure magnesium substrates by means of laser cladding using a direct blown powder method.

TL;DR: In this paper, X-ray powder diffraction (XRD), ultraviolet spectroscopy studies (UV-vis), Fourier Transform Infrared analysis (FTIR), scanning electron microscopy (SEM), and cyclic voltammogram (CV) were used to characterize the CdO nanocrystals.

TL;DR: In this paper, the optical properties of Hf1−xTixO2/Si gate stack were investigated by employing Cauchy-Urbach model, and the optical constants, such as refractive index (n), extinction coefficient (k), absorption coefficient (α), and optical band gap (Eg), were determined precisely.

TL;DR: In this paper, the optical properties of kesterite thin films were investigated by spectrophotometric and Photothermal Deflection Spectroscopy (PDS) measurements to assess the absorption coefficient of samples with different compositions.

TL;DR: In this article, structural, optical and magnetic characterizations of the annealed samples were performed using X-ray powder diffraction (XRD), transmission electron microscope (TEM), energy dispersive Xray fluorescence (EDXRF), Fourier transform infrared (FTIR) spectroscopy, UV-visible spectrophotometry, photoluminescence (PL) and vibrating sample magnetometer (VSM) measurements.

TL;DR: In this article, the structural and elastic properties of Ca-Pb intermetallic compounds were investigated by using the first-principles calculations based on density functional theory, and the calculated equilibrium structural parameters were in good agreement with the available experimental data.