Showing papers in "Materials Characterization in 2019"

TL;DR: In this article, a general thermodynamic framework is laid down that provides a bridge between the quantities accessible with DFT and the targeted thermodynamic and mechanical properties, and it is shown how chemical disorder and various finite-temperature excitations can be modeled with density functional theory.

TL;DR: In this article, the additive manufacturing (AM) process was used to produce high tensile properties of WE43 cubes with minimal porosity, and the microstructure of the original powder material was investigated via tensile testing.

TL;DR: Inconel 738LC samples were fabricated by selective laser melting (SLM) using different laser powers and scanning speeds and investigated using a range of characterisation techniques as mentioned in this paper, indicating that the solidification of the alloy melt during SLM may have started with preferential nucleation of oxide particles, followed by the widespread nucleation and growth of γ cellular structure.

TL;DR: In this paper, an Al-7wt%Si alloy was processed by Equal Channel Angular Extrusion (ECAE) at temperatures 20°C and 160°C up to three passes.

TL;DR: A review of solid solution strengthening models for random concentrated solid solutions of which high entropy alloys are an interesting subset is presented in this article, where the basic concepts of this theory is explained and its capabilities are compared with few other existing models for solute strengthening of HEAs.

TL;DR: In this paper, a review focusing on CCA that have been investigated and developed with a mechanical application in mind is presented, and a special importance is attributed to the mechanical testing methods, and priority is given to tensile testing at both room temperature and up to 700°C.

TL;DR: In this paper, the effect of initial microstructure on high cycle fatigue behavior of Inconel 718 superalloy was investigated, where the material was deposited at a 45° (diagonal) and a 90° (horizontal) angle with respect to the loading direction using direct metal laser melting (DMLM).

TL;DR: In this paper, the precipitates found in the 300 grade maraging steel built by Selective Laser Melting (SLM), which is globally one of the fastest-growing additive manufacturing (AM) technology, were investigated.

TL;DR: In this article, the authors show that the performance of eutectic MPCAs can increase with decreasing interlamellar spacing, according to either λ − 1/2 or λ− 1, similar to that observed in pearlitic steels, with a tradeoff between increased strength and reduced tensile ductility.

TL;DR: In this paper, the effects of LR treatments on side surface quality, residual stress, microstructure, and mechanical properties were investigated in the selective laser melting (SLM) process.

TL;DR: In this article, a feature of interface structure, microstructure and mechanical properties of sandwich composites on base of copper and low carbon steel joined by the explosive welding was investigated.

TL;DR: In this article, the effect of base metal locations on the corrosion behavior of friction stir welded dissimilar 2024-T351 to 7075-T651 aluminum alloys joints in an EXCO solution was identified.

TL;DR: In this paper, the authors provide an overview on single phase BCC high-entropy alloys with disordered structure and analysis of existing data from available literature is performed and trends relative to the processing of such materials, but also to the mechanical behavior and underlying deformation mechanisms, along with some critical view points and prospects.

TL;DR: In this article, two laser cladded layers of 90%Ti + 10%SiC and 80%Ti+ 20% SiC were deposited onto the Ti6Al4V substrate by a single channel feeding system, and they were analyzed by a scanning electron microscope equipped with an energy dispersive spectrometer (EDS).

TL;DR: In this paper, the authors report the highest thermal conductivity of 868 W/mK in boron-modified Cu/diamond composites, which originates from the discontinuous carbide interface in the Cu-B/Diamond composite.

TL;DR: In this article, relatively lightweight AlCoCrFeNi HEA ingots with different initial microstructures were fabricated by utilizing the cooling rate effect, and the associated mechanical properties and strengthening response are also reported.

TL;DR: In this paper, the effects of Cr and Mo on precipitation behavior and associated intergranular corrosion susceptibility of S32654 were investigated by microstructure characterization, thermodynamic calculation and electrochemical measurement.

TL;DR: In this paper, the authors reported monodisperse, chain-like particles (nanochains) consisted of silica-coated maghemite (γ-Fe2O3) nanoparticle clusters prepared by colloidal chemistry and magnetic field-induced self-assembly of nanoparticles.

TL;DR: In this article, the effects of initial microstructure on the hot deformation behaviors of homogenized and annealed Al-7.9Zn-2.0Cu alloys were investigated.

TL;DR: In this paper, a microstructural-mechanical correlative study has been conducted for characterization of selective laser melted H13 tool steel, where columnar microstructures are mostly composed of martensite with small amount of retained austenite.

TL;DR: In this article, the dynamic recrystallization (DRX) behavior of magnesium alloy AZ31B with large initial grain size was investigated and two methods were applied to establish the DRX kinetics model.

TL;DR: The microstructure and texture of an Al1050/AZ31/Al1050 laminated composite fabricated by accumulative roll bonding at 400°C up to 5 cycles are investigated using Electron BackScatter Diffraction, neutron diffraction, microhardness measurements and tensile tests.

TL;DR: In this article, the microstructure of simulated CGHAZ with heat input of 10-100kJ/cm was quantified and the crack tip opening displacement (CTOD) at −20°C was evaluated.

TL;DR: In this article, the effect of Ti content on the microstructure evolution and mechanical properties of low-C medium-nondeterministic steel was elucidated, and the sub-micro-laminar structure of reverted austenite and lath-shaped ferrite was obtained after intercritical annealing at 630°C.

TL;DR: In this article, the nano-hydroxyapatite (nano-HA) was uniformly distributed on the surface of magnesium particles by ball milling process, and then the composite of Mg-5.5Zn/HA was successfully fabricated by spark plasma sintering (SPS).

TL;DR: In this article, friction stir welding (FSW) was used to weld dissimilar metals (SS304 and Q235 low carbon steel) and the microstructure, interfacial characteristics, residual stress distribution and mechanical properties of the joint were investigated.

TL;DR: In this paper, microstructural evolutions of small Zn infiltrations or cracks as well as formation behavior of various intermetallic phases were investigated by detailed micro structural evolutions.

TL;DR: In this article, the authors investigated the microstructural characteristics of Hastelloy X produced by Selective Laser Melting (SLM) in the as built (AB) condition and after hot isostatic pressing (HIP).

TL;DR: In this article, the microstructure evolution and mechanical properties of AZ91 alloy processed by equal channel angular pressing (ECAP) combined with prior and post aging treatment were investigated.

TL;DR: In this paper, the evolution of microstructure and hardness in a CoCrFeNi high-entropy alloy (HEA) processed by severe plastic deformation (SPD) was studied.