The effects of boron and sulfur impurities on the ideal cleavage fracture properties of Ni3Al under tensile stress are investigated using the full-potential linear-muffin-tin-orbital total-energy method, with a repeated slab arrangement of atoms simulating an isolated cleavage plane. Results for the stress-strain relationship, ideal cleavage energies, ideal yield stress and strains with and wit...

Adsorption of CO on metal atoms surfaces is one of the most thoroughly studied adsorption systems. It is a prototypical model system for investigating molecular adsorption, and of fundamental importance in many catalytic reactions. However, real catalysts often consists of several components, and offer geometric and electronic properties different from the elemental surfaces. The Ni3Al(111) sur...

Simultaneously improving strength and ductility has been an attractive theme in materials science engineering. Through designing nanostructures, it is possible to overcome the traditional trade-off between of materials. In this paper, we show that introducing superlattice intrinsic stacking faults nickel aluminide (Ni3Al) can facilitate its toughness. comparison with twin boundaries, enhancing ...

This paper investigated the wear performances of Y2O3 doped MA6000 (Ni-Cr-Al) alloy produced by mechanical alloying (MA). Produced, all powders were pre-formed cold pressing and sintered in a vacuum environment. Sintered MA6000- X% superalloys characterized scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) analysis, density, hardness measurements....

We have studied by Spot Profile Analysis Low Energy Electron Diffraction (SPALEED) and Auger Electron Spectroscopy (AES) Ni-Al alloyed layers formed by annealing, around 780 K, Al deposits on a stepped Ni(111) surface. The surface structure and composition of the thin epitaxial Ni3Al and NiAl films, obtained respectively below and above a critical Al initial coverage c θ , differ markedly from ...