Abstract
The paper reviews the results of investigations of surface modification and alloying of Al, Ti, and its alloys with a low-energy (up to ~40 keV), high-current (up to 25 J/cm2) electron beams of microsecond duration under systematically varied conditions. The microstructural evolution of the surface layers of Al alloys (Al2024 and Al6061) and Ti-6Al-4V alloy subjected to pulsed melting as well as changes in surface-sensitive properties of these alloys are considered. Phase formation and properties of Al-based and Ti-based surface alloys, synthesized by liquid-phase mixing of multilayer film-substrate systems in wide range of solid solubility, including [Al/Si]/Al, [Al/C]/Al, [Zr/Ti]/Ti-6Al-4V, and Al/Ti, are studied. In case of Ti-based substrates, this method allows to fabricate the single-phase nanocrystalline α-(TiZr) surface alloy, free of Al and V, as well as nanosized and ultrafine grain TiAl/Ti3Al-based surface alloys of thickness ≥3 μm with enhanced mechanical properties.
Highlights
Light aluminum and titanium alloys are very attractive materials for aerospace and automobile industries owing to their low-density and high specific strength
The major factors, which determine the microstructure and properties of a material in the e-beam-affected zone are the nonstationary temperature fields induced in the surface layers as result of absorption of a beam energy, and stress fields induced by pulsed heating of the surface
Using multiple procedures of Al film deposition onto Ti substrate followed by pulsed melting, the TiAl surface alloys in the wide range of composition have been formed under systematically varied conditions
Summary
Light aluminum and titanium alloys are very attractive materials for aerospace and automobile industries owing to their low-density and high specific strength. Titanium and its alloys are widely used for biomedical applications like artificial joints and dental implants Such surface-sensitive properties of Al and Ti alloys as wear behavior, corrosion resistance, and fatigue strength need to be improved to insure high performance and durability of components. One of the promising approaches to this goal is the surface treatment of Al and Ti alloys with low-energy (up to ∼40 keV), high-current (up to ∼50 kA) electron beams (LEHCEBs) of microsecond duration. The major factors, which determine the microstructure and properties of a material in the e-beam-affected zone are the nonstationary temperature fields induced in the surface layers as result of absorption of a beam energy, and stress fields induced by pulsed heating of the surface. Examples of improving the surface-sensitive properties of these alloys are given
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