In this study, thin layers of titanium nitride (TiN) were deposited on H13 steel substrates at different duty cycles and temperature of 520 ˚C using plasma assisted chemical vapor deposition (PACVD). Uniaxial residual stress was calculated by X-ray diffraction (XRD) and Sin2 Ψ method. Then the residual stress of the samples were measured by Grazing Incidence X-ray Diffraction (GIXRD) method and lattice parameter diagrams versus f(Ψ). Depth of penetration and texture coefficient in the samples were also evaluated. The surface morphology was examined using field-emission gun scanning electron microscope (FESEM) and the relationship of the stress and micro hardness test was also expressed. The results showed that by reducing duty cycles, residual stress decreases as well as with more changes of the lattice parameter, more changes of residual stress will be seen. Also, the microstructure result was in good agreement with theory and clearly displayed spherical morphology and uniform distribution of the created phases تفاصيل المقالة

Co3W2Si intermetallic compound was synthesized by mechanical alloying (MA) of W, Co and Si elemental powder mixtures. The phase composition of the milled products was evaluated by X-ray diffraction (XRD) analysis. Morphological evolutions were characterized by transmission electron microscopy (TEM). The results showed that high energy ball milling performed in the present work led to the formation of Co3W2Si intermetallic phase after 50h MA. A thermodynamic analysis of the process was then carried out using Miedema model. The thermodynamic results showed that there exists a positive thermodynamic driving force in W–Si and Co-Si binary systems and W-Co-Si ternary system to form a solid solution at all compositions but Gibbs free energy change in Co-W binary system is positive for solid solution formation. So that, there is no thermodynamic force to form a solid solution in Co-W system. In Co-W-Si ternary system, the addition of elemental W to Co3Si compound decreases Gibbs free energy change and more stable structure forms. تفاصيل المقالة