In the present study, structural characterization of NiTi smart shape memory alloys (SMAs), produced by an alternative powder metallurgy approach named mechanically activated reactive forging (MARFOS), was carried out by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was observed that MARFOS materials had a multiphase nanocrys...

One practical solution for utilizing hydrogen in vehicles with proton-exchange fuel cells membranes is storing hydrogen in metal hydrides nanocrystalline powders. According to its high hydrogen capacity and low cost of production, magnesium hydride (MgH2) is a desired hydrogen storage system. Its slow hydrogenation/dehydrogenation kinetics and high thermal stability are the major barriers restr...

Abstract The effect of heat treatment on the microstructure, phase composition, mechanical properties, and microhardness shape-memory Сu–14 wt % Al–3 Ni alloy prepared in nanocrystalline state, which results from severe plastic high-pressure torsion (HPT), is studied. Electron microscopy X-ray diffraction analysis are used combination with electrical resistivity measurements order to obtain dat...

In ferromagnets with a nonuniform magnetocrystalline and/or magnetoelastic anisotropy, such as nanocrystalline ~nc-! or cold-worked ~cw-! polycrystalline materials, the static magnetic microstructure gives rise to strong elastic magnetic small-angle neutron scattering ~SANS!. The paper explores a method for analyzing field-dependent SANS data from such materials in terms of a model based on the...

Carbides, borides and nitrides of high melting transition metals were synthesized by high energy ball milling of elemental powder mixtures. The obtained hard material phases show a nanocrystalline structure with a saturation value of the crystal sizes between 7-8 nm. The kinetics of the reaction were investigated, and the nanocrystalline powders were densified by HIP. Introduction The formation...

Ni-based mixed particles composite coatings were designed to achieve superior wear resistance by combining hard carbides and solid lubricants as a reinforcing mix. Pure nickel single-particles composites electrodeposited in the same conditions for benchmarking. A pre-study was carried out optimise current density avoid loss of process efficiency due hydrogen evolution. The production also impro...

The phase composition, magnetic state of the phases and their influence on formation hysteresis properties nanocomposite with (Fe 0.85 Mn 0.10 Ni 0.05 ) 83 C 17 composition after mechanosynthesis subsequent annealing have been studied. It is shown that, although dependences coercive force temperature H_c(T ann alloy, measured at room liquid nitrogen temperatures, are curves maxima, H c driven b...