Abstract
The effect of continuous Ar+ ion beams (E = 30 keV, j = 400 μA/cm2; F = 5·1016 cm-2) on the hardness and microstructure of the Gr2-titanium-based and Ti-6Al-4V alloys after cold working and subsequent recrystallization annealing is studied. It has been found that the initial microstructure of the annealed alloys in the equilibrium state, which consisted of recrystallized equiaxed grains, does not change after irradiation; thus the hardness of the irradiated samples is comparable with that of the initial samples. The initial fine fiber structure of the deformed Ti-6Al-4V alloy changes insignificantly after both annealing (T = 790°C, 30 min) and ion irradiation under used conditions. In contrast to that, the effect of rapid radiation annealing of the cold-worked titanium Gr2 alloy with beams of accelerated ions of inert gas at low temperatures (lower by 130°C than the conventional annealing temperature of these alloys at 680°C) and for a shorter time (9 min instead of 35 min, τirr ∼ 20 s) has been revealed. The result is the formation of a uniform recrystallized structure with equiaxed fine grains 5-10 μm in size in the entire volume of the 3-mm-thick samples, despite the fact that the average projected range of 30-keV Ar+ ions in titanium is only 20 nm.
Highlights
Examples of the successful use of accelerated ion beams in industrial processes to modify the electrical, magnetic, mechanical, contact-chemical, and other material properties have emerged in recent years [1,2,3,4,5,6,7,8,9,10]
The main problem of accelerated-ion-beam-based technologies used to modify the physical and mechanical properties of metals and alloys is a little depth of the impact zone. In normal conditions it is limited by a zone of the accelerated ion range, the length of which at ion energies obtained in the technological accelerators (
It was established that the initial microstructure, which consisted of recrystallized equiaxed grains, was retained after Ar+ ion irradiation of the annealed titanium Gr2 and Ti-6Al-4V alloys under used conditions (E = 30 keV, j = 400 μA/cm2; F = 5·1016 cm-2)
Summary
Examples of the successful use of accelerated ion beams in industrial processes to modify the electrical, magnetic, mechanical, contact-chemical, and other material properties have emerged in recent years [1,2,3,4,5,6,7,8,9,10]. Authors of many published works dedicated to irradiation of metals and alloys with accelerated ion beams studied structural changes in the ion range zone and tried to find a way to increase the ion penetration depth using heating (i.e., thermally-stimulated processes) and increased ion energy.
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