Evolution of Grain Boundary Precipitates in an Al-Cu-Li Alloy During Aging

Noémie Ott; Shravan K. Kairy; Yuanming Yan; Nick Birbilis

doi:10.1007/s11661-016-3848-1

Evolution of Grain Boundary Precipitates in an Al-Cu-Li Alloy During Aging

Noémie Ott^*, Shravan K. Kairy, Yuanming Yan, Nick Birbilis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

The grain boundary microstructure of Al-Cu-Li alloy AA2050 was investigated for different isothermal aging times to rationalize intergranular corrosion (IGC) characteristics. In the underaged condition, the dominant grain boundary precipitates are fine T₁ (Al₂CuLi). Extended aging revealed that grain boundaries were decorated by large T₁ precipitates and S′ phase (Al₂CuMg), with S′ growth not dimensionally constrained. Such a transition in the precipitate type at grain boundaries is a unique feature of the Al-Cu-Li system.

Original language	English
Pages (from-to)	51-56
Number of pages	6
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	48
Issue number	1
DOIs	https://doi.org/10.1007/s11661-016-3848-1
Publication status	Published - 1 Jan 2017
Externally published	Yes

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abstract = "The grain boundary microstructure of Al-Cu-Li alloy AA2050 was investigated for different isothermal aging times to rationalize intergranular corrosion (IGC) characteristics. In the underaged condition, the dominant grain boundary precipitates are fine T1 (Al2CuLi). Extended aging revealed that grain boundaries were decorated by large T1 precipitates and S′ phase (Al2CuMg), with S′ growth not dimensionally constrained. Such a transition in the precipitate type at grain boundaries is a unique feature of the Al-Cu-Li system.",

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AU - Birbilis, Nick

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AB - The grain boundary microstructure of Al-Cu-Li alloy AA2050 was investigated for different isothermal aging times to rationalize intergranular corrosion (IGC) characteristics. In the underaged condition, the dominant grain boundary precipitates are fine T1 (Al2CuLi). Extended aging revealed that grain boundaries were decorated by large T1 precipitates and S′ phase (Al2CuMg), with S′ growth not dimensionally constrained. Such a transition in the precipitate type at grain boundaries is a unique feature of the Al-Cu-Li system.

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Evolution of Grain Boundary Precipitates in an Al-Cu-Li Alloy During Aging

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