In this paper, the phase structure, composition distribution, grain morphology, and hardness of Al6061 alloy samples made with additive friction stir deposition (AFS-D) were examined. A nearly symmetrical layer-by-layer structure was observed in cross section (vertical respect to fabrication-tool traversing direction) as-deposited a back-and-forth AFS-D strategy. Equiaxed grains region underneath fabrication tool, while elongated seen "flash region" along mass flow direction. No clear size...

Additive manufacturing (AM) has enabled new opportunities of high-performance alloys for use in complex components across the aerospace, industrial, automotive, and energy industries. These industries have growing interest copper AM heat exchangers such as rocket engine combustion chambers. GRCop alloys, GRCop-84 (Cu-8Cr-4Nb at.%) GRCop-42 (Cu-4Cr-2Nb at.%), high thermal conductivity mechanical properties at elevated operating temperatures. In this paper, thermophysical produced using laser...

In this study, refractory high entropy alloys (RHEAs) Mo20Nb20Re20Ta20W20, Mo15Nb20Re15Ta30W20, and Mo15Nb20Re10Ta35W20 were studied by applying the first-principles density functional theory (DFT) method. The DFT calculation was based on a large unit cell model of 100-atom supercell, with randomly distributed five element atoms. mechanical properties all three RHEAs calculated compared. Comparing other two RHEAs, Mo15Nb20Re15Ta30W20 possesses balanced an optimized concentration expensive Re...

In this paper, small blocks of 17-4 PH stainless steel were manufactured via extrusion-based bound powder extrusion (BPE)/atomic diffusion additive manufacturing (ADAM) technology in two different orientations. Ultrasonic bending-fatigue and uniaxial tensile tests carried out on the test specimens prepared from AM blocks. Specifically, a recently-introduced small-size specimen design is employed to carry time-efficient fatigue tests. Based results testing, stress-life (S-N) curves created...

Solid-state Friction Stir Additive Manufacturing has recently gained attention as a result of its capacity to fabricate large-scale parts while preserving the mechanical properties feedstock material. However, correlation between quality layer-by-layer bonding deposited metal and processing parameters remained unknown. Neutron imaging techniques, with 90% total transmission per cm, are employed for Al6061 fabricated by MELD® Technology non-destructive evaluation approach first time...

Hardness is an essential property in the design of refractory high entropy alloys (RHEAs). This study shows how a neural network (NN) model can be used to predict hardness RHEA, for first time. We predicted several alloys, including novel C0.1Cr3Mo11.9Nb20Re15Ta30W20 using NN model. The from was consistent with available experimental results. prediction verified by experimentally synthesizing and investigating its microstructure properties hardness. provides alternative route determine Vickers RHEAs.

Currently, no commercial aluminum 7000 series filaments are available for making parts using fused deposition modeling (FDM)-based additive manufacturing (AM). The key technical challenge associated with the FDM of alloy is consolidating loosely packed powders in brown-body, separated by thin layers surface oxides and polymer binders, into a dense structure. Classical pressing sintering-based powder metallurgy (P/M) technologies employed this study to assist development processing strategies...

Thermal conductivity (TC) is greatly influenced by the working temperature, microstructures, thermal processing (heat treatment) history and composition of alloys. Due to computational costs lengthy experimental procedures, obtaining for novel alloys, particularly parts made with additive manufacturing, difficult it almost impossible optimize compositional space an absolute targeted value conductivity. To address these difficulties, a machine learning method explored predict TC manufactured...

This study investigated the influence of diverse laser processing parameters on thermophysical properties Ti-6Al-4V and AlSi10Mg alloys manufactured via powder bed fusion. During fabrication, power (50 W, 75 100 W) scanning speed (0.2 m/s, 0.4 0.6 m/s) were adjusted while keeping other constant. Besides parameters, this also explored impact test temperatures alloys. It was found that L-PBF alloy samples sensitive to showed less sensitivity. In general, for alloy, as increased scan decreased,...

Abstract This paper examined the effect of Si addition on cracking resistance Inconel 939 alloy after laser additive manufacturing (AM) process. With help CALculation PHAse Diagrams (CALPHAD) software Thermo-Calc, amounts specific elements (C, B, and Zr) in liquid phase during solidification, susceptibility coefficients (CSC) criterion based $$\left| {{\text{d}}T/{\text{d}}f_{{\text{s}}}^{1/2} } \right|$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfenced> <mml:mrow>...

The deoxygenation of organic acids, important biomass feedstocks and derivatives, to synthesize hydrocarbon products under mild electrochemical conditions, holds significant importance for the production carbon-neutral biofuels. There is still limited research on influential factors decarboxylation reaction medium-chain fatty acids. In this study, n-octanoic acid (OA) was chosen as subject investigate behavior OA a platinum electrode, focusing influence different alkali metal cations (Li+,...

This paper evaluated the effects of laser beam irradiation based surface modifications Ti-10Mo alloy samples under either Ar or N2 environment to corrosion resistance and cell integration properties. The morphology element distributions after treatments were using a scanning electron microscope, energy-dispersive x-ray spectroscopy, photoelectron spectroscopy. Phase analysis was performed with diffraction. electrochemical behavior in simulated body fluid maintained at 37 ± 0.5 °C,...

In this work, the formation of carbide with concertation carbon at 0.1 at.% in refractory high-entropy alloy (RHEA) Mo15Nb20Re15Ta30W20 was studied under both ambient and high-pressure high-temperature conditions. The x-ray diffraction dilute (C)-doped RHEA pressure showed that phases lattice constant were not influenced by addition C. contrast, C-doped unexpected phase transformation combined conditions resistively employing heated diamond anvil cell (DAC) technique. new FCC_L12 appeared 6...

This study investigated the impact of low-temperature heat treatments on mechanical and thermophysical properties Cu-10Sn alloys fabricated by a laser powder bed fusion (LPBF) additive manufacturing (AM) process. The microstructure, phase structure, thermal LPBF samples were comparatively under both as-fabricated (AF) condition after at 140, 180, 220, 260, 300 °C. results showed that did not significantly affect grain structures alloys. Both pre- post-treatment displayed consistent sizes,...