Showing papers in "Intermetallics in 2011"

TL;DR: In this paper, two refractory high entropy alloys with compositions near Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20, were produced by vacuum arc-melting.

TL;DR: In this paper, it was shown that the intrinsic correlation between hardness and elasticity of materials correctly predicts Vickers hardness for a wide variety of crystalline materials as well as bulk metallic glasses (BMGs).

TL;DR: In this article, electron beam melting (EBM) is used to realize a selective densification of metal powder by melting it in a layerwise manner following a CAD design, and microstructure, the residual porosity and the chemical composition of the samples have been investigated both immediately after EBM and after heat treatments.

TL;DR: In this article, the microstructure, hardness, and corrosion properties of as-cast Al 0.5 CoCrFeNi alloys aged at temperatures between 350 and 950°C were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe Xray microanalysis (EPMA).

TL;DR: In this paper, the isothermal oxidation behavior of Ti-45Al-8Nb and Ti-52Al- 8Nb alloys at 900°C in air was investigated.

TL;DR: In this article, a Pd20Pt20Cu20Ni20P20 bulk metallic glass (BMG) with a high-entropy (HE) alloy composition and a maximum diameter of 10mm was fabricated by fluxed water quenching.

TL;DR: In this paper, the feasibility of Ti6Al4V to stainless steel AISI 316L welding through pure copper interlayer carried out by electron beam and pulsed Nd:YAG laser is reported.

TL;DR: In this paper, the MS-SPS-prepared MnSi 1.75 shows a much improved ZT of 0.62 at 800 K, which represents an enhancement of 100% compared with the samples synthesized by the traditional method.

TL;DR: In this article, a rapid and cost-effective melt spinning (MS) subsequently combined with a spark plasma sintering (SPS) process was utilized to prepared n-type Bi 2 (Te 1− x Se x ) 3 ( x ǫ = 0.0-1.0) solid solutions from high purity single elemental chunks.

TL;DR: In this paper, a dependable and reproducible series production route for low pressure turbine blades made from intermetallic titanium aluminide alloys for aero-engine applications in lengths between 200 and 400mm is presented.

TL;DR: In this paper, the formation of the intermetallic phase in the aluminide layer was investigated by using a combination of scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD).

TL;DR: In this paper, a spot welding of Al plate to Mg plate was produced by friction stir spot welding using various tool rotation speed and duration time of the tool to investigate the effects of the welding parameters on the reaction of Al and Mg alloy.

TL;DR: In this paper, the influence of single, double and triple filling of didymium, Ca and Ba in Fe 4 Sb 12 as well as in Fe 3 CoSb 12 on the thermoelectric performance was evaluated.

TL;DR: It was found that the high-temperature modification of FeSi2 is stabilized down to much lower temperature in the ternary, confirming earlier literature suggestions on this issue.

TL;DR: In this article, the effect of growth parameters (growth rate V and temperature gradient G L ) on primary solidification phase, solidification path and microstructure parameters were determined.

TL;DR: In this article, the resonant modes and frequencies for a number of possible fillers in p-type R Fe 3 CoSb 12 and R Fe 4 Sb 12 were carried out.

TL;DR: In this paper, the effects of alloying additions on glass formation, mechanical and soft-magnetic properties of Fe-(Si,P,C,B)-based bulk metallic glasses (BMGs) were systemically studied in detail.

TL;DR: The phase equilibria and reaction temperatures in the system Al–Cu were re-investigated by a combination of optical microscopy, powder X-ray diffraction (XRD) at ambient and elevated temperature, differential thermal analysis (DTA) and scanning electron microscopy (SEM).

TL;DR: In this article, the deformation and recrystallization occurred preferentially in the grain boundary β phases because its good high temperature deformability enhances grain boundary sliding and migration, and thus improves the workability.

TL;DR: In this paper, the formation of intermetallic compounds during dissimilar friction stir welding of brass to aluminum and its effect on the mechanical behavior of joint were studied, and the results showed that utilizing rotation speeds higher than 400 rpm leads to gradual formation of interfacial compounds in the stir zone and at the interface.

TL;DR: In this paper, the authors obtained significant tensile plasticity up to 0.7 ± 0.1% together with work-hardening and larger fracture strength in bulk metallic glass with only 2.9± 0.3% thickness reduction.

TL;DR: In this article, the effects of Co nanoparticles additions to Sne3.7Cu on the structure of solder/copper interface have been studied after reflow and high temperature ageing (150 � C, up to 1008 h).

TL;DR: In this paper, a series of experimental efforts have been made in an attempt to gain understanding of shear band propagation in metallic glasses, and it was found that plastic flow serration observed in compression was actually caused by successive (intermittent) shear along a single shear plane, not random shear bands emission.

TL;DR: In this paper, a high-temperature Co-Al-W-base single-crystal alloys were grown with a conventional Bridgman process and the concentration profiles obtained by electron microprobe and analyzed via the Scheil equation indicate distribution coefficients for Co, Al, W and Cr that are close to 1.6.

TL;DR: In this article, the fracture toughness of Ti-45Al-2Nb-1.5V-1Mo-0.3Y alloy has been investigated, which exhibits fine nearly lamellar microstructures and fracture toughness.

TL;DR: In this article, the effect of Y2O3 crucible on contamination of directionally solidified (DS) alloy in a Bridgman-type apparatus was studied. But the main mechanism responsible for the contamination of the DS samples is diffusion controlled dissolution of the Y2 O3 crucibles in the melt which leads to an increase of oxygen and yttrium content in γ(TiAl)+α 2(Ti3Al) matrix and precipitation of non-metallic particles in interdendritic region.

TL;DR: In this paper, the phases identified by thermal and microscopic analysis of the piston alloy AlSi13Cu4Ni2Mg, which was solidified under different conditions, are presented and compared with different piston alloys.

TL;DR: In this paper, the structural relaxation of bulk metallic glasses was investigated by differential scanning calorimetry (DSC) and the results indicated that the relaxation time decreases with increasing the annealing temperature.

TL;DR: In this paper, the authors studied the pest-oxidation of MoSi 2 samples from hot uniaxial pressing from a 2-μm grain-size powder of commercially available MoSi2.

TL;DR: In this article, phase equilibria in the Co-rich Co-Al-W-Ti quaternary system at a temperature range between 900 and 1200°C with a close attention to the thermodynamic stability of the γ′-Co3(Al, W, Ti) (L12) phase, based on micro-structure observation and electron microprobe analysis on bulk alloy samples heat-treated for periods up to 2000h.