Interaction between Cu and Sn in the Early Stages of Ageing of Al-1.7at.%Cu-0.01at.%Sn

Laure Bourgeois; Timothy Wong; X.Y. Xiong; Jian Feng Nie; Barry C. Muddle

doi:10.4028/www.scientific.net/MSF.519-521.495

Paper Titles

Coherency Loss of Al₃Sc Precipitates during Ageing of Dilute Al-Sc Alloys
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Influence of Cd and In on the Formation Kinetics of the δ' Metastable Phase in Al-Li-In(Cd) Alloys
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Properties of Rolled and Extruded Semiproducts Made of New Al-Cu-Mg-Ag Heat-Resistant B-1213 Alloy
p.483

Study of the Nanostructures Formed in 2024 Alloy during Thermomechanical Treatments
p.489

Interaction between Cu and Sn in the Early Stages of Ageing of Al-1.7at.%Cu-0.01at.%Sn
p.495

Precipitation Behaviour of Zirconium Compounds in Zr-Bearing Al-Mg-Si Alloy
p.501

Age-Hardening Behaviour and HRTEM Observation of Precipitates in Excess Mg Type Al-Mg-Si-Ag Alloy
p.507

The Effect of Ag-Addition on Crystal Structure of β'-Phase in Al-Mg-Si Alloy
p.511

Effect of Small Additions of Fe on the Tensile Properties and Electrical Conductivity of Aluminium Wires
p.515

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Interaction between Cu and Sn in the Early Stages of Ageing of Al-1.7at.%Cu-0.01at.%Sn

Abstract:

The interaction between vacancies and Sn and Cu solute atoms in an Al-1.7at.%Cu- 0.01at.%Sn alloy was investigated by exploring the effect of incorporating natural ageing into conventional age hardening treatment. It was found that provided the artificial ageing temperature does not exceed a critical value between 160°C and 200°C, a narrow window of natural ageing (3-100 h) will result in a significant acceleration of the age hardening response and no decrease in peak hardness. Transmission electron microscopy showed that this effect reflects a large and rapid increase in number density of Cu GP(I) zones, and, to a lesser extent, of θ". The distribution and number density of θ' are essentially unaffected. Three-dimensional atom probe provided strong evidence that refinement of GP(I) zone distribution is not due to clustering of Cu atoms onto pre-existing Sn clusters. Instead it appears to be caused by a subtle interaction between vacancies, Sn and Cu atoms.