Showing papers in "Vacuum in 2018"

TL;DR: In this paper, a simple and eco-friendly method to synthesize Titanium dioxide (TiO2) nanoparticles using green alga Chlorella pyrenoidosa was reported.

TL;DR: In this paper, large scale WO3 nanorods (NRs) and nanosheets (NSs) are prepared successfully by a facile one-step microwave irradiation method, using tungstic acid as tungsten source and CTAB and PEG as surfactants.

TL;DR: In this paper, a multiobjective particle swarm optimization (MO-PSO) technique was used to determine the optimal levels of concentration of hydroxyapatite powder (CHA), peak-current (Ip), pulse-on (Ton), and pulse-off (Toff).

TL;DR: In this article, the solidification behavior and microstructural evolutions during homogenization heat treatment of Inconel 718 superalloy were studied, and the microstructure of the ascast alloy was characterized by optical micrographs, scanning electron microscopy (SEM) images, and elemental analysis based on energy dispersive spectroscopy (EDS).

TL;DR: In this paper, the deformation characteristics of TC18 titanium alloy are studied in the α+β regime by hot compression tests at the strain rates of 0.001-0.1 s−1 and temperatures of 1033-1123 K. Three constitutive models, including the strain-compensated Arrhenius-type, Hensel-Spittel (HS) and artificial neural network (ANN) models, are constructed to depict the flow behaviors of the studied alloy.

TL;DR: In this paper, the structural feature and mechanical properties of PtAlTM (TM = Zr, Hf, Nb, Mo and W) were investigated using ab-initio calculations.

TL;DR: In this paper, a bipolar pulse High Power Impulse Magnetron Sputtering (HiPIMS) based method is proposed to deposit Cu films on silicon wafers, and positive kick pulses with different pulse width and magnitude are applied after the initial negative pulse to drive Cu ions to the substrate.

TL;DR: In this paper, the fatigue behavior of Ti-6Al-4V alloy is tend to be improved by severe plastic deformation via shot peening and plasma nitriding.

TL;DR: In this paper, a crack-free Fe37.5Cr27.5C12B13Mo10 amorphous coating was successfully obtained on 45 steel by laser cladding method.

TL;DR: In this paper, an improvement in the quality of commercially available face mask with nanoparticles (NPs) coating to protect against infectious agents has been discussed, and the commercial face mask was then treated with colloidal silver (Ag) solution with two different concentrations viz. 50 and 100

TL;DR: In this paper, a double-layer diamond/Cu composite was fabricated by a novel method which coated diamond particles with tungsten as the inner layer through salt-bath plating and then deposited copper as the outer layer through electroless plating.

TL;DR: Zinc oxide (ZnO) doped with noble metals (Ag, Au) at a concentration of 2 1/2mol% have been synthesized by combustion.

TL;DR: In this article, a low elastic modulus porous biodegradable Mg-Zn-Mn-HA composite for orthopedic applications via mechanical alloying and spark plasma sintering (MA-SPS) technique was investigated.

TL;DR: In this article, a novel flower-like polyaniline/graphitic carbon nitride (PANI/g-C3N4) nanocomposite was successfully synthesized.

TL;DR: In this paper, the authors studied the hot deformation behavior of 25Cr3Mo3NiNb steel by means of isothermal hot compression tests and established constitutive equations based on strain compensated Arrhenius and modified Johnson-Cook models, respectively.

TL;DR: In this paper, the microstructure, hardness, and mechanical properties of thin-walled parts with dimension of 260mm length and 150mm height were fabricated by wire and arc additive manufacture (WAAM) using H13 wire and Metal-Inert Gas Welding (MIG).

TL;DR: In this paper, the effect of intercritical annealing on the microstructure and mechanical properties of a low carbon steel with the chemical composition (wt%) of 0.12C-1.16Si is studied.

TL;DR: In this paper, the isothermal tensile deformation behaviors of Ti-5Al - 5Mo - 5V - 1Cr - 1 Fe alloy in β phase field are studied at the wide ranges of temperature and strain rate.

TL;DR: In this article, the effects of the RGO content and applied loads on the coefficient of friction (COF) and wear rates were evaluated using a ball-on-disc configuration.

TL;DR: In this article, the strength-ductility synergy of 316L stainless steel was achieved through medium cold rolling and subsequent annealing, which successfully fabricated heterogeneous lamella structure (HLS), reduced processing cost and improved preparation controllability.

TL;DR: In this article, a grafted copolymer of guar gum/polyacrylic acid (GG/Poly(AA)) has been synthesized by two-step free radical graftcopolymerization using ammonium persulphate (APS) as initiator and N, N′−methylenebisacrylamide (MBA) as cross-linking agent.

TL;DR: In this article, a series of ZrN-Ag films with various Ag contents (Ag/(Zr+Ag), at.%) were deposited by reactive magnetron sputtering and their microstructure, mechanical and tribological properties at various testing temperatures were investigated by the energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Xray photoelectron spectraopy (XPS), transmission electron microscopy (TEM), nanoindenter and high temperature tribometer.

TL;DR: In this paper, a new multi-principal element alloy system, CrCoNiMox, is designed by adding Mo in FCCCrCoNi alloy to improve the strength and wear resistance.

TL;DR: In this article, the effect of Cr3C2 content on microstructure, microhardness and wear resistance was investigated using a ball-on-disc machine under dry condition.

TL;DR: In this article, the deformation and micro-structural evolution of the Ti55531 alloy in the β single phase region were investigated, and a physically-based deformation constitutive equation and DRX kinetics, critical condition and grain size models were developed.

TL;DR: Shin et al. as discussed by the authors studied the formation of deformation-induced martensite during cold rolling of an AISI 316 stainless steel, based on X-ray diffraction (XRD) phase analysis and metallographic etching.

TL;DR: LiNi0.5Co0.2Mn0.3O2 was resynthesized by a novel metallurgical approach coupled with solid-state sintering using cathode materials from spent lithium-ion batteries (LIBs) as starting materials as mentioned in this paper.

TL;DR: In this article, the deformation mechanism and microstructural evolution of a solid-solution Ni-Fe-Cr-base superalloy during the non-isothermal two-stage hot compressive deformation are investigated.

TL;DR: In this article, the microstructural evolutions of the brazed joints were examined using SEM and EDS, and the mechanical properties of the joints were investigated through shear testing.