Showing papers in "Scripta Materialia in 2019"

TL;DR: In this paper, the authors developed a unique "crystallographic lamellar microstructure" (CLM), in which two differently oriented grains appear alternately, in a 316L stainless steel specimen via selective laser melting technology.

TL;DR: In this paper, a series of CoCrFeNiCux (x = 0.0, 0.2, 1.0) high entropy alloys were prepared using arc melting technique and the effect of Cu on microstructure evolution and wear was studied both at room and high temperature.

TL;DR: In this paper, a face-centered cubic (fcc) phase Co-rich non-equiatomic CoCrMnNiFe HEAs with tensile properties superior to the counterparts, derived from lowering stacking fault energy (SFE) via modifying constituent concentrations.

TL;DR: In this paper, high-entropy boride ceramics with ultra-high hardness were prepared by spark plasma sintering of the self-synthesized highentropy Boride powders.

TL;DR: In this paper, high strength aluminum alloy can be fabricated by laser powder bed fusion (LPBF) through alloy design and microstructural control, and the results demonstrate that high strength Al-6Zn-2Mg alloys with 1'wt% (Sc,Zr) additively manufactured by LPBF using gas atomized powders.

TL;DR: In this paper, the first report of synthesizing a high-entropy carbide powder using individual transition metal oxides and carbon as precursors was presented, with an average particle size of about 550 nm and an oxygen content of 0.2

TL;DR: In this article, a single high-entropy phase material with hexagonal structure is produced by a two-step processing method using self-propagating high-temperature synthesis (SHS).

TL;DR: In this paper, the tensile yield strength of a single Al0.3CoCrFeNi high entropy alloy (or complex-concentrated alloy), can be enhanced from 160 MPa to over 1800 MPa (1.8 GPa) via microstructural engineering enabled by thermo-mechanical processing of the bulk alloy.

TL;DR: In this article, a friction stir processed Fe38.5 (Cu-HEA) exhibited excellent mechanical properties and high corrosion resistance in synergy, attributed to the controlled transformation of ultrafine γ matrix and e twinning; whereas good corrosion resistance was due to homogenized fine grained γ microstructure.

TL;DR: In this article, a novel nanoparticles-strengthened high-entropy alloy, Ni30Co30Fe13Cr15Al6Ti6, which exhibits excellent strength-ductility combinations at both ambient and cryogenic temperatures was designed.

TL;DR: In this paper, the phase decomposition of a single-phase body-centered-cubic (BCC) HfNbTaTiZr refractory high-entropy alloy (RHEA) is examined at different temperatures.

TL;DR: In this article, triply periodic minimal surfaces within a range of sizes and volume fractions were designed to match the needs of the different existing bone tissues, and compression experiments reveal the stiffness and the collapse load of the scaffold as a function of geometry and density.

TL;DR: In this article, an equiatomic quaternary (Y1/4Ho 1/4Er 1 /4Yb1/ 4 )2SiO5 solid solution is investigated as a multifunctional thermal and environmental barrier coating (TEBC) material.

TL;DR: In this article, a non-equiatomic Ti-Nb-Ta-Zr-Mo high-entropy alloys for metallic biomaterials (bio-HEAs) were designed and developed.

TL;DR: In this article, the authors showed that adiabatic shear instability is not necessary for impact-induced jetting and bonding to occur in cold spray and developed a mechanistic framework to estimate the critical velocity for jetting on the basis of a hydrodynamic spall process.

TL;DR: In this paper, the Hall-Petch coefficient of a Ti-6Al-4V alloy with fully equiaxed and two different bimodal microstructures obtained by intercritical annealing at 850 and 950°C (BM850) was studied.

TL;DR: In this article, a CrMnFeCoNi equiatomic high entropy alloy (HEA) with a single solid solution was cold rolled, followed by annealing treatment.

TL;DR: In this article, the solid solution formation and consolidation of the (Ta,Zr,Nb)C single-phase ceramic made from commercial TaC, ZrC and NbC powders prepared by spark plasma sintering at the temperature of 1920°C was investigated.

TL;DR: In this article, an Al0.3CoCrFeNi high-entropy alloy was thermo-mechanically processed to yield a UFG triplex microstructure (davg: 0.71 ± 0.35 μm) with FCC, and hard B2 and sigma phases.

TL;DR: In this article, high-purity and superfine high-entropy metal diboride powders were successfully synthesized via a facile borothermal reduction method at 1973 K for the first time.

TL;DR: In this article, a Reactive Flash Spark Plasma Sintering (ReaFSPS) method was developed to synthesize high-entropy ultrahigh temperature ceramics (UHTCs).

TL;DR: In this article, the authors show that face-centered-cubic CrCoNi medium-entropy alloy sustains a Charpy V-notch impact toughness (AK) as high as 340 J at 4 K.

TL;DR: In this article, the authors used the classic Rappaz-drezet-gremaud model to predict the characteristic depression pressure limit beyond which hot tearing will occur for the selective laser melting of metals and alloys.

TL;DR: A remarkable Luders-type localized deformation having a huge Luders strain of 04 was observed in tensile deformation of an ultra-fine grained austenitic stainless steel fabricated by two-step cold rolling and annealing processes as discussed by the authors.

TL;DR: In this article, the effect of low angle grain boundary (LAGB) on deformation of a titanium material and its size effect was investigated by performing in situ transmission electron microscope (TEM) experiments and three dimensional dislocation tomography.

TL;DR: In this article, the authors report an efficient strategy to prepare bulk UFM alloys via the direct solidification method for eutectic high-entropy alloy (EHEA).

TL;DR: In this paper, an ultrafine-grained CoCrNi medium-entropy alloy with nanotwins is fabricated by high-pressure torsion followed by annealing; and investigated for cryogenic tensile properties.

TL;DR: In this paper, the microstructure evolution resulting from HPT-induced mechanical alloying was studied using transmission electron microscopy, X-ray diffraction and 3D atom probe tomography.

TL;DR: In this paper, the effect of Mg on materials strengthening was investigated in commercial purity Al, Al-0.5Mg and Al-4.1Mg alloys.

TL;DR: In this article, atom probe tomography (APT) was used to demonstrate homogeneous distribution of the constituent elements at the atomic scale in high entropy oxides (HEOs) for the first time.