Showing papers in "Intermetallics in 2007"

TL;DR: In this article, a transition from paramagnetic to superparamagnetism has been discovered due to the appearance of nanoparticles embedded in the amorphous phase of CoCrCuFeNiTi0.5 alloy.

TL;DR: In this paper, the influence of the Al content and the addition of further alloying elements on the cast microstructure of γ(TiAl)+α 2 (Ti 3 Al) alloys has been examined.

TL;DR: In this article, a new version of the Ni-P phase diagram was established based on XRD, EPMA and DTA measurements, which provides the basic knowledge for understanding the interactions between Sn-based solders and common Ni(P) metallization.

TL;DR: The thermoelectric properties of Sb-doped Mg2Si have been characterized by Hall effect measurements at 300 K and by measurements of electrical resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (κ) between 300 and 900 K as mentioned in this paper.

TL;DR: In this article, three types of microsegregation were observed in as-cast microstructure of the large ingot: solidification segregation at interdendritic area, β-segregation at boundary and triple junctions among α grain due to the phase transformation of β→α.

TL;DR: In this paper, Voronoi polyhedra analyses were performed for the initial states and also for the deformed states of the CuxZr1−x (x = 0.30 − 0.85) amorphous alloy models.

TL;DR: In this article, the effects of alloying on the microstructures, solidification path, phase stability and oxidation kinetics of Nb ss /Nb 5 Si 3 base in situ composites of the Nb-Ti-Si-Al-Cr-Mo-Hf-Sn system have been investigated.

TL;DR: In this article, the formation and growth rate of intermetallics of frequently used metallisation systems for flip-chip bumping have been studied and are reported for many years However, no data are available on diffusion couples with flipchip processing methods and actual flipchip scale dimensions.

TL;DR: A martensitic NiTi foam was produced by hot isostatic pressing a blend of NiTi and NaF powders and subsequent dissolution of the NaF phase as mentioned in this paper.

TL;DR: In this paper, the effect of Hf alloying on Ti site, Pt and Pd alloys on Ni site, and Sb doping on Sn site for the optimization of thermoelectric properties of TiNiSn-based compounds was investigated.

TL;DR: The influence of alloy composition on the solid-state transformations which occur during continuous cooling of TiAl-based alloys has been studied with the aim of defining the alloy compositions which most strongly influence the massive transformation as mentioned in this paper.

TL;DR: The phase stability and microstructures of Nb ss /Nb 5 Si 3 based in situ composites alloyed with Hf and Sn have been investigated in this article, where the Hf-rich regions in the 5-3 silicide probably corresponded to the γNb5 Si 3.

TL;DR: In this article, the structural and electronic properties of the IMC have been analyzed and the results show that Ni atoms preferentially occupied 8f sites (Cu2) and formed Cu 4 Ni 2 Sn 5.

TL;DR: In this paper, Wang et al. summarized the recent development in this area and found that all newly developed parameters can be grouped into three basic categories according to their definitions, and the universal GFA indicator? is still the best in terms of reliability and applicability.

TL;DR: In this paper, high temperature tensile and creep behaviors of Tie45Ale9(Nb,W,B,Y) alloy with duplex (DP) microstructure were investigated.

TL;DR: A series of new formulae have been presented in this paper to describe the transformed fraction of hydriding/dehydriding reaction as a function of time t, temperature T, hydrogen partial pressure P H 2 and particle radius R 0.

TL;DR: In this paper, mechanical alloying followed by hot-pressing consolidation has been used to obtain bulk nanocrystalline FeAl intermetallic compound and the results obtained show that the quality of compaction with preserving nanometric grain size is satisfactory and its microhardness is relatively high.

TL;DR: In this paper, a bulk dense nanostructured material obtained by spark plasma sintering of Y2O3 dispersion strengthened milled Fe-40Al powder is characterized in detail using scanning (SEM) and transmission electron microscopies (TEM) in order to investigate the mechanisms of its microstructure formation.

TL;DR: In this paper, the influence of oxygen on solidification behavior of cast TiAl-based alloys containing 40-48 at.% of Al was studied and it was shown that increasing oxygen content affects significantly the macrostructure of the as-cast ingots, increases volume fraction of the α phase formed during peritectic solidification, and leads to a change of the β primary solidification phase to the alpha phase in ternary Ti-44.2Al-1.4O, Ti-47.3Al-0.9O, and Ti-

TL;DR: In this paper, a small amount of silicon and antimony additions (individual and combined) have been carried out on AZ91 alloy and its effect on electrochemical corrosion behavior is investigated.

TL;DR: In this article, a Tie48Al alloy was induction melted and allowed to cool and solidify in a ZrO2-based crucible with an inner layer of Y2O3, and the effect of superheating parameters (time and temperature) on the metalecrucible interface, alloy chemical composition, microstructure and microhardness was evaluated.

TL;DR: In this article, a super-high strength Fe-based bulk glassy alloy with some compressive plastic strain and good soft-magnetic properties was synthesized by copper mold casting.

TL;DR: The isothermal oxidation kinetics of molybdenum silicide based alloys with composition (in at%) as 76Mo-14Si-10B (MSB), 77Mo-12Si-8B-3Al (MSb3AL), and 734Mo-112Si-81B-73Al processed by reaction hot pressing of elemental powders, have been investigated in the temperature range of 700-1300-°C in dry air for 24h as discussed by the authors.

TL;DR: In this paper, the effects of the addition of Cr element on glass formation, magnetic and corrosion properties of Fe-Co-B-Si-Nb-Cr alloys have been investigated, and it was found that the added Cr element slightly decreases the glass-forming ability (GFA), but is very effective in increasing corrosion resistance and improving soft magnetic properties for this Fe−Co−B−Si−Nb bulk glassy alloy within the composition range examined.

TL;DR: In this article, a hot-pressing consolidation of mechanically alloyed nanocrystalline Fe(Al) and TiC composite powders containing different amounts of reinforcement is presented.

TL;DR: In this article, a combinatorial sputtering approach for synthesizing ternary metallic glass alloys on both silicon and sapphire substrates was reported, and the results indicated that the phases present in the films at different compositions were in good agreement with the binary Zr-Cu phase diagram.

TL;DR: In this paper, the authors investigated the constitution of the ternary system AleNieTi and found that all invariant equilibria of the binary system NieTi are shifted to higher temperatures.

TL;DR: In this paper, the authors identified the best bulk metallic glass forming composition at ΔHchem and Sσ/kB maxima in a specific range of configurational entropy (Sconfig/R) in Zr-Cu-Al system with the help of a thermodynamic parameter.

TL;DR: In this paper, the effects of Sn and Ti on the microstructure and hardness of the as cast and heat treated Nb-18Si-5Sn (NV9) and Nb−24Ti−18Si−5sn (NV6) alloys were studied.

TL;DR: In this paper, a duplex near-gamma TiAl specimen deformed to surface tensile strain of about 1.4% was used to prove that these microcracks are a result of twins and not dislocation slip bands.