Precipitation in stretched Al-Cu-Mg alloys with reduced alloying ...
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Precipitation in stretched Al-Cu-Mg alloys with reduced alloying ...
N. Gao, L. Davin. 1. , S. Wang, A. Cerezo. 1 and M.J. Starink. Materials Research Group, School of Engineering Sciences, University of Southampton,.
Published in Materials Science Forum, 2002, vol. 396-402, pp 923-28
Precipitation in stretched Al-Cu-Mg alloys with reduced alloying content studied by DSC, TEM and atom probe N. Gao, L. Davin1, S. Wang, A. Cerezo1 and M.J. Starink Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ 1
Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
Keywords: DSC, atom probe, precipitation, Al-Cu-Mg alloys, GPB zone
Abstract. The hardening and microstructural evolution during ageing of a Al-1.2Cu-0.5Mg and a Al-1.2Cu-1.2Mg (at.%) alloy has been investigated. Artificial ageing at 150°C of stretched and naturally aged samples initially (up to about 48 h) leads to very limited further strengthening, but ageing at 190°C results a quick increase in strength. Detailed microstructural investigation using differential scanning calorimetry, transmission electron microscopy and three-dimensional atom probe demonstrated that hardening at 150ºC is mostly dominated by the formation of solute clusters with varying compositions and plate-like zones rich in copper at early stages of ageing (t
