Abstract
The effect of Ar+ ion irradiation and subsequent prolonged aging on the microstructure and phase transformations in a B-1461 alloy (Al–Cu–Li–Zn–Mg–Zr–Sc) subjected to megaplastic deformation (MPD) has been studied by transmission electron microscopy. A mixed structure, consisting of nanocrystalline and nanofragmented regions has been found to form in the alloy upon MPD. Subsequent short-term Ar+ ion irradiation (E = 20 keV, j = 300 μA·cm−2, F = 1.9×1015 cm–2) forms dislocation tangles, increases the nonuniform distribution and the size of structural elements, as well as volume fraction of a T2-phase (Al3CuLi5) nano and submicrocrystals heterogeneously nucleated at boundaries. Structural changes are observed at a distance of ~ 200 μm from the surface, which considerably exceeds the projective ion range (~ 20 nm). The structure of the B-1461 alloy after MPD and subsequent irradiation under the above conditions is unstable.
Highlights
A mixed structure, consisting of nanocrystalline and nanofragmented regions has been found to form in the alloy upon megaplastic deformation (MPD)
Subsequent short-term Ar+ ion irradiation (Е = 20 keV, j = 300 μA cm-2, F = 1.9 1015 cm–2) forms dislocation tangles, increases the nonuniform distribution and the size of structural elements, as well as volume fraction of a T2phase (Al3CuLi5) nano and submicrocrystals heterogeneously nucleated at boundaries
In the last years, increasing attention is paid to the creation of nanostructured metal materials to obtain unique complex of physical and mechanical properties
Summary
In the last years, increasing attention is paid to the creation of nanostructured metal materials to obtain unique complex of physical and mechanical properties. The effect of 10–40 keV gas ion beams on metastable media was shown could be an alternative to thermal annealing, resulting in similar or even more improved properties, as well as multiply accelerated process and a decreased energy consumption [4,5,6]. It is of interest to study the availability of ion-beam processing of alloys subjected to MPD instead of traditional annealing. The stability of the structural components of metal alloys is known to determine the stability of their properties (including mechanical) during operation.
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