DP1000 steel sheets with different surface treatments were taken to 3‐point bending tests to evaluate their damage and fracture behavior. It is found that different surface treatments yield different fracture behaviors. Conventional Finite‐Element (FE) simulation with an uncoupled material model is able to capture the material's response only for the sheets with the perfectly smooth surface condition

This work aims to investigate the effect of the process parameters on the densification and microstructure of Inconel 939 (IN939) alloy processed by laser powder bed fusion (LPBF). IN939 is a Ni-based superalloy with high creep and corrosion resistance that can be used up to around 850 °C under load, resulting in higher operative temperatures than the ones commonly allowed for Inconel 718 and Inconel

Laser forming is a powerful tool for fabricating complicated shapes economically. The pattern of laser movement (irradiating scheme) has an essential effect on the shaped form. In this article, the forming of a saddle-shaped surface will be investigated experimentally by the laser forming process. A spiral irradiating scheme is implemented to manufacture a saddle-shaped surface. The main idea of this

Estimating the thermo-elasto-plastic deformation by arc welding through finite element analysis has been used in various industrial fields. The Goldak heat source model is one of the most important and widely used models in finite element analysis, and its parameters are estimated based on the results of previous studies and tests. Part I of this study focused on the adequate heat source model, and

New and more complex casting technologies are growing, and foundries are using innovative methods to reduce cost and energy consumption and improve their product qualities. Numerical techniques, as tools to design and examine the process improvements, are also evolving continuously to embrace modelling of more dynamic systems for industrial applications. This paper will present a fresh approach towards

This study focuses on the high temperature characteristics of thermo-mechanically processed AA7075 alloy. An integrated die forming process that combines solution heat treatment and hot forming at different temperatures was employed to process the AA7075 alloy. Low die temperature resulted in the fabrication of parts with higher strength, similar to that of T6 condition, while forming this alloy in

In this study, 1D structures based on α-MnO2 nanowires and β-MnO2 nanorods were fabricated by a single-step hydrothermal synthesis and evaluated as cathode components for microbial fuel cells (MFCs). The role of crystallinity and morphology on electrocatalytic activity was investigated by combining X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy with an electrochemical

A thermo-mechanical simulation of the wire + arc additive manufacturing (WAAM) process is presented in this work. The simulation consists in the deposition of 5 successive layers of 316 L stainless steel on a 316 L base plate. The thermo-mechanical analysis is solved in two dimensions under plane stress assumption. Nonetheless, the metal addition is taking into account in this numerical analysis. An

This work mainly aims on the investigation of phase hold-up characteristics in a column flotation at different feed solid concentrations performing for an extensive range of working conditions. Phase hold-ups are measured using the electrical resistance tomography (ERT) coupled with pressure transducers technique. Experiments are conducted for two different nature mineral particles: hydrophilic (silica)

Metal foams are an interesting group of lightweight materials, which have appropriate physical, mechanical, thermal, electrical and acoustic properties for various engineering applications. Currently, metal foams are often manufactured in the shape of its final geometry through the casting process and by applying foaming agents. As a result, their use is limited in the complex geometries. In this paper

The efficient separation and transfer of photogenerated charge carriers play indispensable roles in improving the photocatalytic H2 evolution activity. Herein, we designed a Ni2O3-modified Mn0.2Cd0.8S/Cu3[email protected]2S (MCS/CPS) p-n heterojunction structure with a porous morphology for efficient and stable photocatalytic H2 evolution under visible-light irradiation. Novel porous Cu3[email protected]2S

A comprehensive investigation was conducted to delineate the effect of ball size distribution, mill speed, and their interactions on power draw, charge motion, and balls segregation in a laboratory-scale mill. The mill was simulated at different critical speeds with different mill fillings. In total, 165 scenarios were simulated. When the mills charge comprising 60% of small balls and 40% of big balls

In this study, the crystallographic orientation relationship between bcc precipitates and a Ti5Si3 matrix in Mo–50Ti–14Si–6C–6B (at.%) alloy was established. The alloy microstructure consisted of the bcc solid solution, Ti5Si3, Mo5SiB2, and TiC phases. The metal-rich Ti5Si3 phase was formed during a solidification stage, followed by the precipitation of the bcc phase within the Ti5Si3 matrix in the

In this study, a refractory Au-Ag ore from Beiya (Yunnan, China) was characterised and the occurrence states of low-grade gold and silver were clarified. The results revealed that the gold in the ore mainly occurred as visible native gold, which can be leached easily via cyanidation, whereas the visible silver minerals occurred as native silver, acanthite, chlorargyrite, acanthite, pyrargyrite, andorite

Chalcopyrite leaching in acidic ferric sulfate media was improved by addition of ethylene thiourea (ETU) in shaking flask tests with the iron-oxidizing bacterium acidithiobacillus ferrooxidans. In bioreactor experiments, ETU was able to solubilize the chalcopyrite even after the mineral was pre-leached under non-catalytic conditions. Surface analysis of leached chalcopyrite mineral specimens by scanning

In this work, we give a theoretical justification of the non-monotonic character of strain in the process of refinement and formation of a grain-type structure during the deformation processing of low-alloyed copper heat-hardenable alloys. A regularity is revealed, suggesting the alternating behavior of the strain state in the process of the continuous bending of billets. It is found that the continuous

This work is devoted to studying the accumulation of hydrogen in titanium coatings to use a completely new concept of hydrogen accumulators based on a system of easily replaceable cartridges. Modern hydrogen accumulators based on magnesium powder have several problems associated with uneven heating during hydrogen desorption. Increasing the efficiency of hydrogen accumulators and the possibility of

Alloying elements play an important role in adjusting the magnetic and thermal properties of Fe-based amorphous alloys. In this work, the effect of Mo addition on the thermal stability, structural evolution, and magnetic properties of Fe76Si9B10P5 metallic glass was studied. The study revealed that the substitution of a small amount of Mo (1 at.%) for Si enhances the glass-forming ability (GFA) but

Graphene fiber-based supercapacitors have attracted tremendous interest and possess the greatest potential for flexible/wearable energy storage devices. However, their specific capacitance and energy density are not sufficient and impede their widespread practical application. Here, polyaniline/graphene hybrid fibers (PANI/GF) were fabricated by a simple in situ chemical polymerization of polyaniline

While most commercial greases are used to prevent wear and tear in machinery, many specialized applications require electrically conductive grease. Applications include, but are not limited to, use in next generation electric vehicles (NGEVs), superb electric motor bearing protection, and electrical contact improvement. Using recently new invented methods, electrically conductive greases have been

The presence of Pb2+ can activate cassiterite flotation, however, its biotoxicity may lead to environmental issues. Therefore, the feasibility of using Zn2+ instead of Pb2+ in cassiterite flotation was investigated in this study. The effects and mechanism of Zn2+ on the floatability of cassiterite were analyzed using benzohydroxamic acid (BHA) as the collector. The results indicated there was a higher

The combination of multiple active components and engineering of reasonable structures are effective strategies to prepare high-performance electrochemical electrodes. Herein, a specially designed Bi2S3–[email protected] core-shell structure is synthesized using ZIF-67 as a template, in which nanoparticles of Bi2S3 and CoS in the composites are surrounded by a carbon layer with a sufficient amount

Catalytic doping is an important strategy for enhancing the hydrogen storage performance of magnesium hydride. Hence, LaNi4.5Mn0.5 submicro-particles were successfully prepared via a facile wet chemical ball milling method. To further study the catalytic performance, various amount of as-received LaNi4.5Mn0.5 were introduced to MgH2 and the submicro-LaNi4.5Mn0.5 showed best catalytic effect on MgH2

Li1+xTi2-xAlx (PO4)3 (LTAP) x = 0.3, 0.4, 0.5 and 0.7) compounds, prepared at 800 °C by sol-gel, have been studied by X-ray diffraction, Nuclear Magnetic Resonance, Scanning Electron Microscopy and Impedance Spectroscopy. The increment of lithium enhances Li–Li repulsions, favoring the creation of vacancies at the conduction paths intersection (M1 sites), increasing Li mobility along (… M1-M2-M1 …)

Understanding the hot deformation behaviors of materials has a great importance in hot working and shaping for promoting their industrial application. In this study, a Ti-based metallic glassy matrix composite was employed to study the deformation behaviors in supercooled liquid region at strain rates of 10−4/s - 10−2/s by compression tests. The stress-strain curves were composed of the overshoot behavior

The isothermal oxidation of 8 wt% Y2O3 stabilized ZrO2 (YSZ) thermal barrier coating (TBC) and growth behavior of thermal growth oxide (TGO) have been investigated. The average thicknesses of oxide scale and internal oxidation zone of the substrate with coating are significantly smaller compared with the bare substrate. The TGO layer evolves from a black single-layer to a double-layer structure. The

In this work, Ag2Mo1-xWxO4 (x = 0, 0.25, 0.50, 0.75 and 1 mol%) heterostructures were synthesized by a microwave-assisted hydrothermal (MAH) method under 140 °C. The powders are characterized by X-ray diffractogram (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, and spectroscopy in the ultraviolet–visible region (UV–Vis). The photocatalytic degradations

Low cost and efficient electrocatalysts are extremely attractive for hydrogen evolution reaction (HER). Here, three-dimensional hybrid Co3O4@NiWO4 nanocone arrays are firstly constructed by a simple and effective strategy on nickel foam. Due to the open space and enriched active areas provided by the special nanocone arrays heterostructure, Co3O4@NiWO4 exhibits excellent HER performance. The overpotential

The N-doped carbon coated Fe3O4 composites (Fe3O4@NC) are successfully fabricated on a polyacrylonitrile (PAN) phase inversion method and subsequently annealing. Compared with common electrospinning method, needing delicate equipment and strict reaction conditions, this method is facile and ingenious to synthesize PAN-based composites or carbon-coated materials. Applied to lithium ion batteries (LIBs)

Mo–Cu composites exhibit excellent physical and mechanical properties, while the problems of densification and interface seriously limit their application. In this paper, the effect of element Zr on the properties of Mo–Cu composites is investigated aiming to overcome these critical issues. Various compositions of Mo–Cu–Zr ternary composites were fabricated via ball milling, cold isostatic pressing

Ribbons of a Ni55Fe19Ga26 Heusler alloy were prepared by melt spinning technique. The effect of pressure on magnetostructural transitions was studied comparing as-spun ribbons to ribbons previously submitted to an axial pressure and to powder obtained from manually grinded as-spun ribbons. The martensitic transformation present in the as-spun ribbon almost vanishes after pulverization. The structural

Using particle swarm optimization algorithm, we predicted two new atmospheric phases and two new high pressure phasess for OsB2 in the pressure range from 0 to 100 GPa. By first-principles calculations with density functional theory, we further investigate the structure, phase stability, elastic properties, hardness, electronic properties for these structures. Results show that they are all thermodynamically

Here, the thermal and electrical properties of Al doped ZnO were synergistically improved by using high temperature and high pressure (HPHT) technology. HPHT treatment to modulate its crystal structure and microstructure. We simulated this process using first-principles calculations and finite element analysis. Increasing the synthesis pressure improved the electrical and thermal properties. As the

Ca19(1-x)M2(PO4)14:19xEu3+ (M = Mg, Zn) (x = 0.05, 0.07, 0.09, 0.10, 0.11 and 0.12) red phosphors were successfully synthesized by the high-temperature solid-phase reaction method. The phase composition, morphology and characteristic photoluminescence properties of Ca19Mg2(PO4)14 (CMPO):Eu3+ and Ca19Zn2(PO4)14 (CZPO):Eu3+ were analyzed by X-ray powder diffraction (XRD), field emission scanning electron

The hydride phase of Ti50V20Cr30 alloy cast with 4 wt% of 7Zr+10Ni has been investigated. Pressure composition desorption isotherms were measured at 150 °C and 200 °C. These isotherms revealed same desorption of 1.5 wt% at 150 °C and 200 °C. The evolution of the crystal structure upon dehydrogenation was investigated by in-situ neutron diffraction. A sample was fully deuterated at room temperature

In this article, high dense glasses based heavy metal former and modifier have been synthesized. The glass system with composition formula of (60-x)TeO2–10GeO2 -20ZnO–10BaO - xBi2O3 (where x = 2.5, 5, 7.5, and 10 mol. %). The glasses have been produced using the usual melt, quenching, and annealing process. Many physical features were investigated. To confirm the amorphous nature of theses glasses

The solid state phase equilibria in the ternary Er-Nd-Fe system at 1073 K in all the composition ranges were investigated using the experimental results of the X-ray powder diffraction analysis (XRD) as well as those obtained from the Scanning electron microscopy (SEM) equipped with Energy dispersive spectroscopy (EDS). The binary systems Er–Fe, Er–Nd and Nd-Fe were investigated prior to the study

Potassium-ion batteries (PIBs) are advanced and promising energy storage systems because of their abundant potassium resources and low cost. However, the large radius of K+ (1.38 Å) makes it diffuse slowly in the solid electrode and the electrode material volume changes greatly, resulting in the lack of satisfactory materials with high cycle performance and rate capability. Herein, first-principles