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Low-temperature atmospheric calcination is a new technology for solving the current environmental issues associated with activated clay production. In this study, the structural alteration of montmorillonite during the production of activated clay was investigated by this new technology. The results revealed that the increase in temperature aggravates the destruction of montmorillonite layers, which...
The strain gradient plasticity of multiprincipal element alloys, CoCrNi and CoCrFeMnNi, was investigated in work-hardened and annealed conditions using nano-indentation. The hardness of the alloys demonstrated significant dependence on indentation depth, which was explained by geometrically necessary dislocations resulting from the high strain gradients due to the shape of the indenter. The characteristic...
Mingming Zhang and Bowen Li are guest editors for the topic Urban Mining: Characterization and Recycling of Solid Wastes: Part II in this issue. The topic is sponsored by the TMS Materials Characterization Committee (EPD) and the Recycling and Environmental Technologies Committee (EPD & LMD).
Ferrotitanium is used as a deoxidizer, a degassing agent and an alloying element additive in the steel industry. The thermite method, as a way of preparing ferrotitanium, has the advantages of abundant raw material resources, low energy consumption, and low production costs. However, Al and O impurities in ferrotitanium prepared by this method change greatly with its Ti content. The distribution of...
A comparative study of the high-temperature oxidation behavior and mechanism of 0Cr25Ni20 austenitic heat-resistant stainless steel (AHSS) and 0Cr18AlSi ferritic heat-resistant stainless steel (FHSS) at 800°C, 900°C, and 1000°C in air up to 140 h was performed using isothermal oxidation tests. The oxidation kinetics of 0Cr25Ni20 AHSS and 0Cr18AlSi FHSS followed the parabolic law. The oxide films on...
CoCrFeNiVAlx (x values in molar ratio, x = 0, 0.5, 1.0, 1.5 and 2.0, respectively) high-entropy alloys have been designed and prepared. Microstructure and mechanical properties of the CoCrFeNiVAlx alloys have been studied in as-cast conditions. The fcc (face-centered cubic structure) phase and the σ phase (intermetallic phase) have been observed in the CoCrFeNiV alloy. With the increase of Al content,...
Invar non-ferromagnetic Ti-alloys with zero thermal expansion coefficients are designed by optimizing both the alloy composition and the thermomechanical treatment. The thermal expansion coefficient is controlled in those alloys which exhibit high elastic softening, since unique microstructures tend to be formed in them by cold deformation. The strains and stresses stored in the alloys by cold deformation...
For the first time, an artificial intelligence approach, the adaptive neuro fuzzy interface system (ANFIS), has been used for phase predictions in high-entropy alloys. The phase predictions were carried out using two different approaches. The first one was constructed using the composition of elements as the input parameters. The second one was constructed using six parameters, which are found to...
The microstructure and thermal and mechanical properties of (FeCoNiCuCr)100−x-Nbx multiprincipal-element alloys have been investigated in the as-cast and heat-treated state. The alloys were smelted by arc-melting in argon atmosphere. As-cast samples were produced by copper mold casting. The structure was studied by scanning electron microscopy (SEM) and x-ray diffraction (XRD) analysis. The calculated...
Measuring the fracture behavior of small specimens of semibrittle materials such as tungsten is often difficult due to the lack of crack stability and a high ratio of the crack tip plastic zone size to specimen dimensions. To overcome this, microcantilever bending tests were used with a stable chevron notch geometry coupled with elastic–plastic fracture mechanical (EPFM) analysis. The chevron notch...
Machine learning with artificial neural network (ANN)-based methods is a powerful tool for the prediction and exploitation of the subtle relationships between the composition and properties of materials. This work utilizes an ANN to predict the composition of high-entropy alloys (HEAs) based on non-equimolar AlCoCrFeMnNi in order to achieve the highest hardness in the system. A simulated annealing...
Economical processing of textured nanoscale metallic systems is highly sought after, as tuning of crystallographic orientations has a significant impact on their mechanical properties. However, due to constraints in instrument set-up and the high cost involved, there are no experimental investigations on understanding the rolling process and its underlying deformation mechanism at the nanoscale level...
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