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Krawczyńska-Piechna, Anna
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article
Precipitation processes in nanostructured 7475 aluminium alloy
Abstract
<p>In ultrafine and/or nanograined materials, precipitation phenomena are significantly affected by the high surface area of grain boundaries. Therefore, this work tried to evaluate the influence of grain boundaries on precipitation processes in detail. Samples of 7475 aluminium alloy were solution annealed, water quenched and processed at RT by hydrostatic extrusion (HE) and high pressure torsion (HPT). While both processing procedures yield significant reductions in grain size there are differences in the resulting grain shape (fibre-like for HE, pancake-like for HPT) and in the grain boundary type. Extensive grain boundary precipitation occurs in both samples, albeit more pronounced and faster in HPT ones, which can be attributed to the different characters of grain boundaries involved. Inside the grains, precipitates are significantly smaller than in micrograined materials, which has been discussed in terms of HE/HPT induced vacancy concentrations in micro- and nanostructured samples.</p>