Showing papers in "Materials Characterization in 2014"

TL;DR: In this article, microstructural characterisation was performed for IN718 thin-walled builds, produced using direct laser fabrication (DLF), to understand the influence of the variations in the deposition path and the laser power on the microtexture, grain structures and intermetallic particle morphology development.

TL;DR: In this paper, the tensile strength of steel/Cu SLM parts was evaluated using focused ion beam, scanning electron microscopy, energy dispersive spectroscopy and electron back scattered diffraction techniques.

TL;DR: In this paper, an automated crystal orientation and phase mapping technique that allows nanoscale characterization of crystalline materials with a transmission electron microscope is described, and the template matching strategy used to identify the diffraction patterns is detailed and the resulting outputs of the technique are illustrated.

TL;DR: In this paper, the main features of the obtained microstructures are presented, the most important advantage of ultrafine-grain materials -an enhanced mechanical strength with respect to their coarse grained counterparts - is discussed.

TL;DR: In this article, the impact of laser power, scanning speed, and laser path on the microstructure of NiTi cylinders was studied, where the laser power was varied from 56 to 100 W and the scanning speed from about 100 to 300 mm/s.

TL;DR: In this paper, the effect of laser shock peening without coating parameters on the microstructural evolution, and dislocation configurations induced by ultra-high plastic strains and strain rates was investigated.

TL;DR: In this article, the dynamic recovery was the main softening mechanism along with the dynamic recrystallization in the local area within the deformation temperature range of 300-450°C and strain rate range of 0.01-10−s−1.

TL;DR: In this paper, a 304L austenitic stainless steel was subjected to different heat inputs by shielded metal arc welding process using a standard 308L electrode and microstructural developments were characterized by using optical microscopy and electron backscattered diffraction, while the residual stresses were measured by X-ray diffraction using the sin 2 ψ method.

TL;DR: In this paper, the microstructure, mechanical properties and corrosion behavior of cast Ti-Nb alloys to which Sn has been added were discussed, and the results obtained suggested that the physical, mechanical and chemical behaviors of the Ti−Nb-Sn alloys are directly dependent on the Sn content.

TL;DR: In this article, the photocatalytic activities of MoS 2 /g-C 3 N 4 samples were evaluated based on the hydrogen evolution experiments under visible light irradiation (λ < 400 nm).

TL;DR: In this article, a methodology to distinguish martensite formed in the first quench (M1) of the Quenching and Partitioning process is presented, enabling the study of the structural characteristics of both microstructural constituents.

TL;DR: In this article, the physical and mechanical properties of C-S-H gel were linked through the micro-poromechanical approach, and an insight was provided into the microstructural features of C−S−H gel present in cementitious composites.

TL;DR: In this article, the thermal stability of the ultra-fine grained (UFG) microstructure of magnesium AZ31 alloy was investigated, which was achieved by a combined two-step severe plastic deformation process: the extrusion (EX) and subsequent equal-channel angular pressing (ECAP).

TL;DR: In this paper, the feasibility of friction stir butt welding between AA5059 alloy and high density polyethylene sheets is examined, and the results indicate that AA 5059 aluminum and HPDP can be successfully joined with a combination of secondary bonding and mechanical interlocking of the materials, which provides a potential alternative to adhesive bonding or mechanical fastening.

TL;DR: In this article, a simple chemical precipitation method for the preparation of undoped and cerium doped ZnO nanocrystals was reported, where the concentration of cerium in the products can be controlled in the range of 0.025 − 0.125 mol.

TL;DR: In this article, the influence of micro-alloying elements and hot deformation on the precipitation morphology of Ti-Nb and Ti−Nb-Mo steels was investigated.

TL;DR: The microstructure of an SA508-309L/308L-316L domestic dissimilar metal welded safe-end joint was characterized by optical microscopy, scanning electron microscopy (with electron back scattering diffraction) and micro-hardness testing.

TL;DR: In this article, a novel attempt is made to synthesize and study the isolated effects of less than two volume fraction of nano-TiB2 nanoparticulates (60nm) on pure magnesium.

TL;DR: In this paper, the effect of porosity on the corrosion resistance of MRI 201S magnesium alloy foams in 0.9% NaCl solution and in phosphate buffer saline solution as a simulated physiological electrolyte was evaluated.

TL;DR: A new near β titanium alloy with ultra-high tensile strength and reasonable ductility after subtransus solution followed by aging treatment has been developed in China as discussed by the authors, where fracture toughness tests were carried out on the material at room temperature in order to understand the fracture mechanism.

TL;DR: In this article, a study on grain boundary serration in Ni-based Alloy 690 was conducted through various heat treatments, and it was suggested that the grain boundary migration during serration is closely correlated with the precipitation of intergranular Cr carbides in this alloy.

TL;DR: In this paper, an anodic aluminum oxide was formed by self-organized two-step anodization in 0.3 M oxalic acid at four temperatures: 35, 40, 45 and 50 ÂC and three voltages: 30, 60 and 120 Âmin.

TL;DR: In this article, the porosity and fluid distribution in two varieties of Massangis limestone, a widely used natural building stone from the southeast part of the Paris basin (France), were analyzed using differential imaging.

TL;DR: In this article, the effects of welding time and natural aging on peak load and fracture energy of welded aluminum alloy AA6111 and TiAl6V4 dissimilar alloys were investigated.

TL;DR: In this paper, the joining of stainless steel316 to stainless steel-316 in the bulk form has been carried out by placing stainless steel 316 powder at the interface and through targeted heating using microwave hybrid heating.

TL;DR: In this paper, a detailed study of the microstructure and texture evolution at different processing stages was carried out by optical microscopy, X-ray diffraction and electron backscattered diffraction analysis.

TL;DR: In this paper, the authors extend a recently developed dilation-erosion method and employ the Yeong-Torquato stochastic reconstruction procedure to model and generate 3D austenitic-ferritic cast duplex stainless steel microstructure containing percolating filamentary ferrite phase from 2D optical micrographs of the material sample.

TL;DR: In this article, the authors implemented two rolling modes to investigate the strain path effect on deformation and annealing textures of austenitic stainless steel 316L. They applied unidirectional rolling and cross-rolling to achieve up to a 90% reduction in thickness.