Effect of Irradiation with Si+ Ions on Phase Transformations in Ti–Al System during Thermal Annealing

Abstract

The article deals with the effect of irradiation with Si+ ions on phase transformations in the Ti–Al system during thermal annealing. An aluminum film with a thickness of 500 nm was deposited on VT1-00 titanium samples by magnetron sputtering, followed by ion implantation. Samples before and after irradiation with Si ions were annealed in a vacuum of 10−4 Pa in the temperature range 600–1000 °C. It was established that ion implantation reduces the dissolution of Al in α-Ti with the formation of titanium silicides (TiSi2, Ti5Si3) and stabilizes aluminide phases Ti3Al rich in aluminum. As a result, a composite structure based on titanium silicide/aluminide was obtained on the surface of the sample synthesized by complex treatment: deposition, irradiation with Si+, and thermal annealing at the near-surface layers. The formation of the phase-structural state of the implanted layers is associated with the displacement of atoms of the crystal lattice, a result that is reflected in an increase in the size of the crystal lattice and a decrease in microdistortion of the lattice. The opposite effect is observed with increasing temperature. This fact is explained by the relaxation of unstable large grains with an excess of internal energies. At the annealing temperature of 900–1000 °C, a significant increase in microhardness was observed due to silicide phases.

Investigation of High-Temperature Oxidation of Homogeneous and Gradient Ni-Cr-Al Coatings Obtained by Detonation Spraying

“…The results of X-ray phase analysis after testing for high-temperature cyclic oxidation (25 and 50 cycles) of samples coated with Ni-Cr-Al are shown in Figures 3 and 4. The results show that, regarding the phases formed on the surface of homogeneous and The results of X-ray phase analysis after testing for high-temperature cyclic oxidation (25 and 50 cycles) of samples coated with Ni-Cr-Al are shown in Figures 3 and 4 In a further discussion of these oxide compounds, we outlined the CNS abbreviation, which will be used by other researchers [31][32][33][34][35]. Prior to testing for high-temperature cyclic oxidation, the homogeneous Ni-Cr-Al coating consisted of the CrNi 3 phase and the Ni-Cr-Al gradient coating consisted of the CrNi 3 , Al, and NiAl phases [26].…”

Effect of Bilayer Thickness and Bias Potential on the Structure and Properties of (TiZr/Nb)N Multilayer Coatings as a Result of Arc-PVD Deposition

“…The tests were carried out at a load of 100 mN. Loading time—5 s, unloading time—5 s, maximum load holding time—5 s. The dependence of the penetration depth on the applied force at the stages of loading and unloading was determined by the Oliver–Pharr method [ 35 ]. At least 10 measurements were carried out on each sample, the results of which were averaged.…”

Investigation of Microstructure and Mechanical Properties of Tungsten Irradiated by Helium Plasma

“…Deterioration of tungsten under these circumstances will constrain the component's longevity and negatively impact the efficiency of the fusion plasma, as sputtered tungsten atoms and dust ingress. The combined effects of damage caused by neutrons and helium, originating from both transmutation and plasma injection, will induce substantial alterations in tungsten's mechanical properties [3,4]. A crucial aspect is comprehending the underlying mechanisms governing these effects, as it is essential for modeling the failure mechanisms of plasma-facing tungsten.…”