Showing papers in "Scripta Materialia in 2018"

TL;DR: In this paper, a new class of high-entropy perovskite oxides (i.e., multiple-cation solid solutions with high configurational entropies) has been synthesized.

TL;DR: In this paper, a near-fully dense CoCrFeNiMn high entropy alloy was additively manufactured by selective laser melting successfully, and the as-built samples exhibit a hierarchical structure, including melt pools, columnar grains, sub-micron cellular structures, and dislocations.

TL;DR: In this article, the influence of near-surface denuded zones and implanted ion effects is analyzed, including diffusional broadening effects, at high ion irradiation energies, which can lead to enhanced defect production or recovery.

TL;DR: In this paper, the addition of 1.08% Sc to an Al-Mg-Zr alloy produced by selective laser melting modifies the highly coarse columnar grain structure to significantly refined columnar grains separated by sub-micron equiaxed grains at the melt pool boundaries.

TL;DR: In this article, nano-scale MnSiO3 Rhodonite particles were observed in 316L stainless steel fabricated by selective laser melting (SLM) and these oxide particles act as Zener-pinning particles providing dragging force to retard grain growth, and enhance strength through the comparison of Hall-Petch effects between SLM 316L and commercial wrought 316L under 1200°C isothermal heat treatment.

TL;DR: In this paper, the moment of impact bonding of individual metallic microparticles on metallic substrates was studied. But the authors focused on the unit process of materials buildup in cold spray coatings/additive manufacturing.

TL;DR: In this article, the disparity between the Mg corrosion rates in vivo and the expected corrosion rates based on in vitro testing was analyzed. And the authors concluded that the medical environment and the biocorrosion mechanism is not fully characterized.

TL;DR: In this paper, the segregation of solutes at dislocations in a polycrystalline and a single crystal nickel-based superalloy is studied, showing that pipe diffusion initiates the undesirable dissolution of γ' precipitates.

TL;DR: A series of novel Co-free high-entropy alloys (HEAs) were developed by engineering nanoprecipitation in Fe-Ni-Cr-Mn-Al-Ti system, which exhibit a good combination of low cost, high strength and good ductility as mentioned in this paper.

TL;DR: The additive friction stir deposition (ASD) as mentioned in this paper is a fast, scalable, solid-state process that results in refined microstructures and has flexible options for feed materials.

TL;DR: In this paper, the hardness of ZrB2 layers can be improved from 43.2 −1.0 GPa to 45.8 − 1.8 GPa through the formation of solid solution ternary diborides (Zr0.61Ti0.20Hf0.19V0.24B2) and high-entropy Diboride (ZR0.23Ti0 0.39B2), respectively.

TL;DR: In this paper, the existence of chemical short-range orders (CSROs) in high-entropy alloys (HEAs) using a cluster-plus-glue-atom model was verified.

TL;DR: In this paper, the authors reported a largely improved ductility (25.1% total elongation) of LSFed extra low interstitial Ti-6Al-4V titanium alloy with a comparable tensile strength using triple heat treatment.

TL;DR: In this article, the strength of a commercial β-titanium alloy was tuned by systematically controlling the size-scale of α precipitation via two-step heat treatments, and it was shown that annealing duration at 350°C greatly impacts the α size scale and, this consequently, can be used to tune the ultimate tensile strength (UTS) from ~1 to 2GPa.

TL;DR: In this article, the authors studied the energy absorption mechanism of three porous structures (i.e., cubic, topology optimised and rhombic dodecahedron) at the early stage of deformation and obtained the stress distribution results, obtained by finite element modelling, coupled with the investigation of the slip bands generated have been used to reveal the plasticity mechanism and local stress concentrations for each structure.

TL;DR: Fully recrystallized ultrafine-grained (UFG) pure Cu specimens were fabricated by high-pressure torsion (HPT) and controlled annealing.

TL;DR: In this paper, the authors present a summary of current techniques that are utilized and outline a path towards a more thorough understanding of small volume testing on irradiated materials, including microstructural areas of interest.

TL;DR: In this paper, the effect of annealing on the properties of Fe-6.9wt% Si produced by Selective Laser Melting (SLM), a powder-bed additive manufacturing technology, was investigated.

TL;DR: In this article, structural damage and chemical segregation in Al01CoCrFeNi high entropy alloy irradiated at elevated temperatures are studied using transmission electron microscopy (TEM) and atom probe tomography (APT) Irradiation-induced defects include dislocation loops, long dislocations and stacking-fault tetrahedra.

TL;DR: In this paper, the concept of thermal environmental barrier coatings (TEBCs) for SiC-based ceramic matrix composite (CMCs) hot-section components in gas-turbine engines is elucidated.

TL;DR: In this article, a unique microstructure was observed in 50% cold-rolled and heat-treated eutectic high-entropy alloy (EHEA) with recrystallized FCC grains and B2 precipitates in FCC lamellae with different microstructural length scale.

TL;DR: In this article, a new multi-element β titanium alloy Ti-3Al-5Mo-7V-3Cr (Ti-3573) was designed using the d-electron method based on a commercial alloy.

TL;DR: In this paper, the possibility to produce Ni-base superalloy single crystals by selective electron beam melting (S-EBM) was demonstrated by a tight control of the processing conditions without requiring a grain selector or a crystal seed.

TL;DR: In this paper, two sets of selective laser melting (SLM) process parameters were used alternately to produce a layer-structured NiTi sample and the transformation behavior of the sample showed that austenite transforms gradually into martensite over a wide temperature range during cooling.

TL;DR: In this paper, in-situ X-ray diffraction was used to determine the local transformation temperatures along the thermally affected regions in a laser processed NiTi thin sheet, explaining the peculiar microstructural and mechanical features observed in additive manufacturing of NiTi.

TL;DR: In this paper, the authors found that the work-hardening rate and dislocation density in a twinning-induced plasticity (TWIP) steel deformed at 373 and 473 K, respectively.

TL;DR: In this paper, a microstructurally-based method was proposed to design a proper quenching temperature to obtain an optimum microstructure comprising fine martensite laths and alternatively distributed thin austenite films, which has the optimum balance between fraction and stability of retained Austenite.

TL;DR: In this article, the results of the analysis of residual macro-and micro-stresses in organic-inorganic halide perovskites (OIHPs) thin films are presented in the context of fracture of both the OIHP layer itself and its interface with the substrate.

TL;DR: In this article, a combination of empirical and computational approaches was used to identify three non-equimolar HEA compositions for their predicted ability to form a single-phase structure and to exhibit high corrosion resistance.