There is increasing evidence that vibrational entropy may significantly contribute to the entropy difference between the ordered and the disordered states of a compound. Through first-principles calculations, we investigate the magnitude of this vibrational entropy difference in Ni3Al, a compound where this effect is believed to be especially large. We find the vibrational entropy difference to...

In this study, an addition of Ag micro-particles (8–10 lm) with a content in the range between 0 and 1.5 wt.% to Sn–9Zn eutectic solder, were examined in order to understand the effect of Ag additions as the particulate reinforcement on the microstructural and mechanical properties as well as the thermal behavior of the newly developed composite solders. Here, an approach to prepare a micro-com...

in the present study, nanocrystalline ni50al50-xmox (x = 0, 0.5, 1, 2.5, 5) intermetallic compound was produced through mechanical alloying of nickel, aluminum, and molybdenum powders. alni compounds with good and attractive properties such as high melting point, high strength to weight ratio and high corrosion resistance especially at high temperatures have attracted the attention of many rese...

In this paper, Ni-Al films were prepared using magnetron sputtering technology. The microstructure of the and relationship between residual stress adhesion strength studied. More importantly, mechanical strength–ductility properties evaluated by in situ tensile testing. results showed that film mainly consisted Ni3Al phase Ni-based solid solution at low power Al target. transition occurred, NiA...

Resistance spot welding (RSW) is widely used as a main joining technique in industry and the electrode caps are frequently replaced because of degradation during service. In this study, G type copper RSW were coated with Fe Ni based Fe3Al, FeAl, Ni3Al, NiAl alloys by Electro-Spark Deposition (ESD), providing resistance to hot deformation, oxidation Zn evaporation from sheet metal. The ESD teste...

The thermodynamic properties of Al, Ni, NiAl, and Ni3Al were studied using the first-principles approach. The 0-K total energies are calculated using the ab initio plane wave pseudopotential method within the generalized gradient approximation. The contribution to the free energy from the lattice vibration was calculated using the phonon densities of states derived by means of the ab initio lin...

The compressive creep deforrn;~tiort microstructure of polycrystalline Ni3AI h:is been observed by transnlission electron microscopy (TEM). ( 1 1 I ) rind ( 110) slip systems have been identified in primary creep. Dissociatiort of edge superparti:~l pairs perpendicular to the slip plane (both { 11 1 ) and ( 110) ) is common in crept specimens. I'he formation of this superdislocation...

First-principles total-energy electronic structure calculations based on the full-potential linear-muffin-tinorbital method have been used to study the electronic and mechanical properties of the L12-type ordered nickel-based intermetallics Ni3X ~X5Mn, Al, Ga, Si, Ge!. The calculated values for the equilibrium volume and elastic properties are generally in good agreement with experiments. The l...