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The phase, grain, orientation and local misorientation in the bonding interface of a TC17/TC4 bond at different bonding times were carefully investigated via electron backscatter diffraction technique. Dynamic recrystallization (DRX) occurred in the primary α (αp)-enriched region of the TC4 side, in which large αp grains of the TC4 side transformed into small recrystallized α grains with random orientation...
β-Titanium (Ti) alloys have applications in several industries (e.g. aerospace, automotive, and biomedical) where material performance requirements vary widely. To tailor the microstructure and mechanical properties of β-Ti alloys for various applications, it is critical to understand the influence of individual alloying elements. Toward this goal, we investigated the effect of individual alloying...
Chromium alloy is a key ingredient in stainless steel production, and slag forms a significant proportion of the production process’s output. To investigate how to avoid the leaching of Cr(VI) from stainless steel slag into the environment, we examined the effect of the FeO content on the stability of chromium in the CaO-SiO2-MgO-Al2O3-Cr2O3 system in laboratory experiments. The solidification process...
The leaching behavior of lead and silver from lead sulfate residues in NaCl-CaCl2-NaClO3 media was studied systematically. The results indicate that Cl− concentration, NaClO3 concentration, leaching time and temperature had significant effects on lead and silver leaching, whilst agitation speed and the liquid–solid ratio had a secondary effect on silver leaching but little effect on lead leaching...
The effect of second phases on the creep behavior of Mg-Ca-Zr alloys was investigated. Casting and hot-extrusion processes were performed to prepare Mg-xCa-0.5Zr (x = 0 wt.%, 0.3 wt.% and 0.6 wt.%) alloys with different morphologies and distributions of second phases. The as-cast microstructures of Mg-Ca-Zr alloys consisted of an Mg matrix and coarse Mg2Ca intermetallic compounds distributed at the...
Elektron21 (E21) and its composites with additions of 0.25 wt.%, 0.5 wt.%, and 1 wt.% AlN/Al nanoparticles (NPs) were fabricated by a high shear dispersion technology. Their creep properties were investigated over a stress range between 80 MPa and 140 MPa at 240°C. The grain size exhibits an obvious increase with the addition of AlN/Al NPs compared with the monolithic E21 alloy. Increasing the content...
We used the split Hopkinson dynamic impact test and ABAQUS finite element simulation to study the damage mechanism of dynamic impacts on the 7055-T4 aluminum alloy. The results show that the energy absorption phenomenon occurs when the dynamic impact temperature is 220°C. There is a clear positive correlation between the size of the precipitated phase and the dynamic impact temperature. The regression...
The dynamic precipitation behavior of a Mg-Zn-Ca-La alloy during deformation has been investigated. A large amount of fine precipitates was detected after deformation, indicating that dynamic precipitation occurred. The precipitates at the grain boundaries included Ca2Mg6Zn3 and Mg4Zn7, whereas the intergranular precipitates were mainly Mg4Zn7. Ca, which has a large atomic radius, preferred to segregate...
This article studied the effect of molybdenum and niobium on the microstructures and mechanical properties of laboratory control rolled steels based on grade 22MnB5. The constructed continuous cooling transformation diagrams revealed that an addition of Mo significantly increased the hardenability. Especially in the case of austenite compressed below its recrystallization temperature, an Mo addition...
The combination of flotation and metallurgical processing to treat copper anode slime produces approximately 1400 tons of flotation tailings every year in Yunnan Province. These tailings contain a large amount of valuable metals. In this article, a vacuum distillation three-stage condensation process is proposed to efficiently and selectively separate valuable metals. A laboratory-scale experiment...
The effect of heat treatment conditions on the microstructure and mechanical properties of Mg-3Nd-3Al and Mg-3Nd-0.5Zr alloys has been comparatively investigated. The experimental results showed that the grain size of Mg-3Nd-3Al and Mg-3Nd-0.5Zr alloys was similar, which was 48 ± 4 μm and 46 ± 4 μm in as-cast condition and 50 ± 3 μm and 50 ± 4 μm in solid solution (T4) and solid solution + peak aging...
The possibility of synthesizing MnCo2O4 nanoparticles from MnCl2·4H2O and CoCl2·6H2O via mechanical alloying was investigated and sampled after 1, 2, 3, and 4 h of milling. X-ray diffraction (XRD) analysis showed that the initial materials were changed to MnCo2O4 after 1 h of milling and calcination. The broadening of the XRD lines showed that MnCo2O4 crystallites were on the order of nanometers....
An innovative and environmentally friendly lead-acid battery paste recycling method is proposed. The reductive sulfur-fixing recycling technique was used to simultaneously extract lead and immobilize sulfur. SO2 emissions and pollution were significantly eliminated. In this work, the detailed lead extraction and sulfur-fixing mechanisms in the PbSO4-Fe3O4-Na2CO3-C system were investigated thermodynamically...
Dielectric properties are some of the main parameters of materials, determining their interaction with electromagnetic energy during microwave heating. The dielectric properties of spent automobile catalyst were measured by using the resonance cavity perturbation technique from room temperature to 800°C at 915 MHz and 2450 MHz. The effects of temperature and frequency on the dielectric constant, dielectric...
The recovery of rare earth elements from discarded electronic waste is gaining considerable interest due to the shortage of primary resources. NdFeB permanent magnets were collected from discarded hard disc drives and consist of ~ 28% rare earth values along with 65% Fe in the form of the Nd2Fe14B phase. The magnets were demagnetized, crushed and exposed to microwave irradiation for a predetermined...
The recovery of valuable metals from electronic waste has attracted a great deal of attention recently in the field of recycling. The recovery process for metal resources present within flue dust from e-waste to obtain valuable metals, such as Cu, by both physiochemical and electrical processes has been investigated. The flue dust was generated during the smelting process of e-waste and contained...
A study has been carried out on the elastic modulus of cast ternary Ti-15Mo-W alloys (containing 4 up to 11 wt.% W). Tungsten was added to the Ti-15Mo alloy to improve the mechanical properties. The influence of tungsten content on the elastic modulus is discussed more thoroughly, along with other mechanical properties. Samples were obtained by successive melting using pure metals in vacuum arc re-melting...
This study aims to investigate the physicochemical and thermophysical behavior of the electrode coatings produced using CaO-CaF2-SiO2 and CaO-SiO2-Al2O3 ternary phase systems. Electrode coating compositions for welding power plant materials are either patented or not available in the public domain so researchers need to explore the flux coatings to improve the properties of welds produced. An extreme...
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