The influence of Ti additions on the mechanical and electrochemical behavior of β-Ta5Si3 nanocrystalline coating

Investigation of slurry erosion-corrosion behavior of Ta(Si1−xAlx)2 nanocrystalline coatings

“…For instance, the hardness of heated sintered TaSi 2 , which is composed of many nanometer-sized grains (an average grain size about 60 nm), was measured to be 13 GPa [19]and the values of hardness and elastic modulus for a bent TaSi 2 fiber was observed to be 11 GPa and 251 GPa, respectively [20]. This phenomenon also has been found in other nanocrystalline metal silicides coatings reported in our previous works, which was is directly traceable to the nanoscale grain with an average grain size less than 10 nm and dense microstructure [21]. Moreover, the values of hardness and elastic modulus of the TaSi 2 coating are slightly reduced by the addition of Al, indicating that Al alloying leads to solid solution softening for TaSi 2 .…”

Precipitation stability and micro-property of (Nb, Ti)C carbides in MMC coating

“…First-principles calculation based on density functional theory (DFT) has a wide range of applications in the structures and properties of doped systems. Xu et al [18] researched the mechanical parameters of Ti substitutional additions of β-Ta5Si3 by theoretical calculation to guide the compositional design and found that the (Ta0.902Ti0.098)5Si3 could achieve the optimum mechanical properties. Farhadizade et al [19] investigated the mechanical and electronic properties and the phase stability of Ti7TMN8 (TM = V, Cr, Mn, Zr, Nb, Mo, Hf, Ta, W, Re and Os) and indicated that the Ti7VN8 and Ti7MnN8 has the maximum hardness of 30.7 GPa compared to other doped nitrides.…”