POSITION SENSITIVE ATOM PROBE STUDIES OF THE COMPOSITION OF Ω AND θ PRECIPITATES IN Al-Cu-Mg-Ag ALLOYSReport as inadecuate




POSITION SENSITIVE ATOM PROBE STUDIES OF THE COMPOSITION OF Ω AND θ PRECIPITATES IN Al-Cu-Mg-Ag ALLOYS - Download this document for free, or read online. Document in PDF available to download.



Abstract : Low concentration additions of silver to Al-Cu-Mg alloys can lead to the formation of platelike precipitates, designated Ω, is formed on {111} planes. Although the morphology of these precipitates has been extensively studied, little information exists about the chemistry of the Ω precipitates, and in particular, about local elemental segregation. In this paper we report the results obtained in a series of experiments carried out in the Oxford atom probe laboratory on the microchemistry of both Ω and θ- precipitates in an Al-Cu-Mg-Ag alloy. The Ω precipitates are found to be richer in magnesium and silver than the θ- precipitates, but are found to have a lower copper content. Studies of coherent interfaces of the Ω precipitates suggest that there is no preferential segregation of magnesium or silver to these interfaces.





Author: C. Grovenor B. Shollock K. Knowles

Source: https://hal.archives-ouvertes.fr/



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