Journal
ACTA MATERIALIA
Volume 122, Issue -, Pages 32-46Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.09.036
Keywords
Al-Cu-Li alloys; Long term ageing; Precipitation; Microstructure
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The evolution of microstructure during long-term ageing (LTA) up to 3000 hat 85 degrees C following a T8 heat treatment has been characterised in three Al-Cu-Li-Mg alloys of variable Mg and Li content. A combination of transmission electron microscopy, differential scanning calorimetry and small-angle X-ray scattering has been used to evaluate the evolution of the different phases. In the T8 condition all three alloys contain a high density of T-1 precipitates together with S precipitates along the dislocations introduced by pre-stretching. In addition, the alloy with highest Li contains delta' precipitates. During LTA this last alloy experiences a significant complementary precipitation of delta'. The two other alloys experience a much more limited microstructure evolution, which appears to be linked to the formation and subsequent evolution of metastable phases (GP and GPB zones) in the regions between T-1 platelets. The evolution of the alloys' strength is shown to be well correlated to their microstructure. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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