Showing papers in "Rare Metal Materials and Engineering in 2010"

TL;DR: In this paper, the effects of joint addition of minor elements Cr, Mn, Zr, Ti and B on grain refinement of Al-Zn-Mg-Cu alloys were investigated by optical microscopy and scanning electron microscopy(SEM)as well as EDS.

TL;DR: In this paper, the microstructures of these nanoparticles were characterized by XRD, TEM and high-concentration laser granularity scatter analyzer, and the best additive content of oil-soluble nano-Cu in SF15W/40 is 0.8% (mass fraction), and in such case the friction coefficient and wear loss are the lowest.

TL;DR: In this paper, an electron beam melting (EBM) process was used to fabricate Ti6Al4V implants with controllable porous structure, and micro-structural pore characterization, porosity and mechanical properties of the fabricated implants were investigated.

TL;DR: In this article, the effect of the particle clustering behavior on the mechanical response of metal matrix composites has been analyzed based on the analysis of the von Mises effective stress and the strain in the matrix and in the particles.

TL;DR: In this paper, Ga, Sn, In and Ni were added into AgCuZn cadmium-free brazing alloys and the mechanical properties of the brazed joints were investigated.

TL;DR: In this paper, the effects of the solution treatment temperature on the microstructure, the chemical composition homogeneity and the microhardness of laser solid forming GH4169 superalloy were investigated.

TL;DR: In this paper, the nano-silver flake with about 30 nm, was prepared by a chemical reduction method, and Cetyltrimethyl ammonium bromide (CTAB) was used to prevent agglomeration of the nanoparticles by its steric hindrance.

TL;DR: LiNi0.5Mn1.5O4 has cubic spinel structure with space group of Fd 3 m, high crystallinity, moderate and uniform particle size as mentioned in this paper.

TL;DR: In this article, four instability criteria, namely Murty, Gegel, Malas and Prasad, were compared, and the physical significance of parameters was analyzed in this paper.

TL;DR: In this paper, the influence of different Ag contents on the properties of Sn-9Zn lead-free solder was investigated, and the results indicated that Ag plays an important role not only in the solderability and the structure of the solder, but also in the mechanical property of the soldered joint.

TL;DR: In this paper, a three dimensional finite element method (FEM) model is established to simulate the forming process of titanium fan blade, in which the mechanical behavior of TC4 obeys Backofen's equation.

TL;DR: In this article, the effect of Hf content on the microstructures after heat treatment and stress rupture properties of DD6 single crystal superalloy was investigated, and the results showed that with increasing of hf content in the range of current research, the residual γ/γ' eutectic increases apparently, the size of γ' particles in dendritic cores has no obvious change and that in interdendritic decreases after heat treatments.

TL;DR: The microstructure features of a kind of Ni-Cr-W superalloy after solution heat treatment at different temperatures (1230-1300 °C) for various time (10-120 min) were investigated by means of scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD).

TL;DR: In this article, the cooling rate has significant effects on the microstructure of Mg-Gd-Y-Zr alloy and the morphology of the primary phases is changed from the coarse to the thin.

TL;DR: In this paper, the authors investigated the isothermal compression behavior of metastable β titanium alloy Ti-B19 in a Gleeble-1500 thermal simulator in the temperature range of 750-1000 °C at an interval of 50 °C and strain rate from 0.001 to 10 s−1.

TL;DR: In this article, the effect of processing parameters, including deformation temperature, strain rate and deformation degree on the microstructure evolution and the micro-structure variables (grain size and volume fraction of primary α phase) was investigated based on the macroscopic observation and the quantitative metallography of the isothermally compressed Ti-6Al-4V alloy.

TL;DR: In this article, a newly developed Ni-Cr-W alloy in air at 1100 °C has been investigated by varying the holding time, and the microstructures and compositions of the surface scale as well as the oxide in cross-section were characterized by Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectrum (EDS).

TL;DR: In this article, the effects of sintering temperature, hot isostatic pressing (HIP) and heat treatment on the microstructure, density and mechanical properties of Inconel718 alloy prepared by metal injection molding were investigated.

TL;DR: In this article, the authors studied the filling process of titanium alloy melt in vertical centrifugal casting, as well as the effect of processing parameters on the formation of defects of Titanium alloy castings.

TL;DR: In this paper, the surface hardness and elastic modulus of the alloy and the polarization curve in the SBF were obtained by Nano Snick and three electrode system, respectively, and the results indicated that the hardness and the elastic modulation are improved after the implantation of Ag ions.

TL;DR: In this article, the anodes of Ti/IrO2-Ta2O5 were prepared using Pechini method and the microstructure and electrochemical properties were studied with SEM, EDX, XRD, potentiodynamic polarization, cyclic voltammetry, electrochemical impedance spectroscopy and accelerated life test.

TL;DR: The relationship between the deposition rate and the deposition temperature does not accord with Arrhenius formula; however, there exists a parabola relation between them as mentioned in this paper. But, the relationship between deposition rate of iridium will reach maximum at 750 °C.

TL;DR: In this article, three microarc oxidization coatings were prepared on magnesium substrates in fluorozirconate electrolyte (Zr-coating), aluminate electrolyte and silicate electrolyte, and the results showed that the Zrcoating is dense and mainly composed of tetragonal ZrO2 (t-ZrO 2), MgF2 and Mg2Zr5O12.

TL;DR: In this article, the morphology, phase, pitting corrosion behaviors and galvanic corrosion resistance behavior of the welded joint of 316L stainless steel and Ti(TA2) clad plate were studied by scanning electron microcopy (SEM), X-ray diffraction (XRD), zero internal resistance ammeter and potentiodynamic polarization technique.

TL;DR: In this paper, the authors quantitatively study the microstructural evolution of α phase in titanium alloys and quantitatively quantitatively quantify the effect of the effective strain on α phase with different morphologies.

TL;DR: In this paper, the tensile properties of TG6 titanium alloy forging disc as solution and aging treatment (STA) state and STA plus 600 °C, 100 h exposed state were tested at various temperatures.

TL;DR: In this paper, the influence of nano-Al 2 O 3 particles on nickel deposition on copper matrix from acid sulphate solution was studied under various potentials by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS).

TL;DR: In this paper, the microstructure evolution of the hydrogenated Ti-6Al-4V titanium alloy was investigated using OM, XRD and TEM techniques, and the phase transformation temperature was related to the phase fraction and phase transformation.

TL;DR: In this paper, a high-concentration silver colloidal nanoparticles with a narrow size distribution were obtained using [Ag(NH 3 ) 2 ] + -PVP(poly (N-vinyl-2-pyrrolidone)) solution via the synergistic action of UV and heat excitation.