Abstract
The effect of irradiation with 20 keV argon ions on the mechanical properties, structure, and phase composition of quenched and then naturally aged, hot-pressed profiles (6 mm thick) from the D16 alloy of the Al-Cu-Mg system has been studied. It was found that short-term irradiation with Ar+ ions (E = 20 keV, j = 200 μA/cm2, F = 1×1016 cm-2, irradiation time 8 s) leads to transformation of the microstructure and phase composition of the alloy. The coarsening of the initial subgrain structure occurs near the sample surface. Both in the surface layer and at a distance of ∼ 150 μm from it, partial dissolution and fragmentation of complex intermetallic compounds of crystallization origin located along grain boundaries are observed, as well as a decrease in the size and change in the morphology of Al6(Fe, Mn) intermetallic compounds of crystallization origin are observed too: the distribution density of lamellar precipitations decreases, and equiaxial precipitations disappear. Under the influence of irradiation, the decomposition of the supersaturated solid solution is activated with the formation of a more stable phase S’. As a result of ion-beam treatment in this mode, the plasticity of the alloy increases while maintaining the strength properties.
Highlights
The results of earlier studies on the effect of the gas ion beam on aluminum alloys [1-5] indicate that there is a possibility in principle of using ion-beam processing at intermediate stages of the technological process of obtaining sheet metal from these alloys
As well as near the irradiated surface, larger particles of phases of the complex composition of crystallization origin are retained in the bulk of the studied samples, the particle size reaches 1.5 μm (figure 3 (a, c)), there are intermetallic compounds based on Al6(Fe, Mn) in the form of extended plates
Conclusion it was found that short-term irradiation with Ar+ ions (Е = 20 keV, j = 200 μA/cm2, F = 1×1016 cm–2) leads to the transformation of the microstructure and phase composition of naturally aged hot-pressed alloy profiles D16
Summary
The results of earlier studies on the effect of the gas ion beam on aluminum alloys [1-5] indicate that there is a possibility in principle of using ion-beam processing at intermediate stages of the technological process of obtaining sheet metal from these alloys. It was found that such treatment, in addition to accelerated (within a few seconds) annealing of work-hardened sheets 1-6 mm thick during cold rolling, makes it possible to control the intermetallic composition of the alloys In this regard, it is of interest to study the possibility of using ion irradiation as an additional final processing operation to improve the functional properties of sheets and profiles made of aluminum alloys. Measurements, and results The results of measuring the mechanical properties of samples cut from extruded profiles of alloy D16 in the initial state and after ion irradiation are given in table 1
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