A new concept to circumvent some of the problems that are hindering a rational metallic catalyst development is introduced. Investigation of conventional metal catalysts – which consist of supported metals, metal mixtures or alloys – is handicapped by the presence of a variety of active sites, their possible agglomeration, metal-support interactions as well as segregation of the components. In ...

The elimination of the FexAly type phases was considered the solution to low ductility presented in aluminum-steel welded joints. Recently, the researches do not seek the suppression but the control of the thickness of these compounds. In this work, Al-Fe joints were manufactured by solid state and fusion welding, looking for controlling the formation of intermetallic comp...

the use of fe-al intermetallic compound coatings has been investigated in order to improve the tribological behaviour of carbon tool steel. the coatings were formed by a pack cementation process and subsequently diffusion annealing at 900˚c in an argon controlled atmosphere. the optimum diffusion time was selected on the basis of optimum thickness and tribological behaviour. the microstructure ...

2014 Inelastic neutron scattering experiments have been performed on the intermetallic compounds NdPb3 and NdSn3. Well resolved transitions between crystal field levels were observed at different temperatures and for each compound, two level schemes were possible. Magnetic measurements and elastic neutron scattering experiments were performed to remove this uncertainty. The experimental crystal...

X-ray diffraction analysis of the alloy system Co-Ni-Cr-Ta showed that the ternary alloy base consisted of three phases (a, ,8, and v-). Addition of Ta caused a decrease in the intensity of the 3 lines. Further Ta additions caused diffraction lines characteristic of the intermetallic compound a-Co3Ta. At higher Ta concentrations, the intensity of the lines characteristic of the aphase increased...

In formation of an intermetallic compound from the elementary metals there is usually a contraction in volume. Electron transfer leading to the charge states M(+) and M(-) with increase in valence and decrease in volume explains the more than 2-fold range in contraction for different compounds in the same binary system. In a more thorough analysis, the better packing of atoms of different sizes...

Successful metallurgical design of metal-matrix-composites relies on the knowledge of the intrinsic property profiles of the metal matrix and especially the compounds employed for particles, whiskers or fibres. In this work we compiled the key properties melting point, bulk modulus, shear modulus, Young׳s modulus, density, hardness, Poisson׳s ratio and structure/space group from the widespread ...

A titanium silicide material based on Ti.sub.5 Si.sub.3 intermetallic compound exhibits substantially improved oxidative stability at elevated temperatures. In particular, carbon is added to a Ti.sub.5 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.6 weight % C) effective to impart substantially improved oxidative stability at elevated temperatures, such as about 1000 Si.sub.3 b...

Abstract: The microstructural features of the early stage of ordering of the intermetallic compound Pt2FeCu have been examined using optical and transmission electron microscopy in conjunction with X-ray diffraction technique. It was found that the compound has similar morphological alteration to that of FePt in which the ordering cannot be suppressed by rapid quenching. The early stage of ...