Microstructure and mechanical properties of a 2091 AlLi alloy-I. Microstructure investigated by SAXS and TEM

P. Gomiero, F. Livet, Y. Brechet, F. Louchet

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Abstract

The microstructure of the 2091 alloy (AlLiCuMgZr) alloy has been studied and compared to that of two simpler AlLi and AlCuMg alloys. The SAXS, in situ SAXS and TEM techniques have been used for heat treatments at room temperature and at 150°C. The time evolution of the size and of the volume fraction of the δ′ precipitates and of the Cu-rich GPB zones have been determined. The δ′ precipitates are shown to follow a classical Lifschitz-Slyosov-Wagner law. Their interfacial energy has been estimated. S and S′ precipitates have also been characterized, respectively on grain boundaries and on helical dislocations, by TEM.

Original languageEnglish
Pages (from-to)847-855
Number of pages9
JournalActa Metallurgica Et Materialia
Volume40
Issue number4
DOIs
Publication statusPublished - Apr 1992
Externally publishedYes

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