The Li stance on precipitation in Al–Li-based alloys: an investigation by X-ray Raman spectroscopy

Klobes, Benedikt; Petschke, Danny; Lotter, Frank; Potapkin, V.; Staab, T.E.M.

doi:10.1007/s10853-022-07018-w

Cited by 2 publications

(2 citation statements)

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“…The formation of δ' precipitates occurs through a nucleation and growth process, leading to the clustering of Li atoms. The temperature range for δ' precipitate formation typically occurs in the range of 180-250 • C [32][33][34].…”

Section: Dsc Investigationmentioning

confidence: 99%

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Investigating the Effect of Heat Treatment on the Microstructure and Hardness of Aluminum-Lithium Alloys

Radan,

Songmene,

Zedan

et al. 2023

Materials

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In this study, the effects of heat treatment on the microstructure and strength (micro-hardness) of an aluminum–lithium (Al-Li) base alloy containing copper (Cu) and scandium (Sc) were investigated, with a view to enhancing the alloy performance for aerospace applications. The heat treatment conditions were investigated to understand the precipitation behavior and the mechanisms involved in strengthening. Aging was carried out at temperatures of 130 °C and 150 °C for aging times of 1 h, 2.5 h, 5 h, 10 h, 15 h, 25 h, 35 h, and 45 h at each temperature for Al-Li alloy and at 160 °C, 180 °C, and 200 °C for aging times of 5 h, 10 h, 15 h, 20 h, 25 h, and 30 h at each temperature for Al-Li-Cu and Al-Li-Cu-Sc alloys. The investigation revealed that both solution heat treatment and artificial aging had a notable impact on strengthening the hardness of the alloy. This effect was attributed to the characteristics of the precipitates, including their type, size, number density, and distribution. The addition of copper (Cu) and scandium (Sc) was observed to have an impact on grain size refinement, while Cu addition specifically affected the precipitation behavior of the alloy. It led to remarkable changes in the number density, size, and distribution of T1 (Al2CuLi) and θ’ (Al2Cu) phases. As a result, the hardness of the alloy was significantly improved after the addition of Cu and Sc, in comparison with the base Al-Li alloy. The best heat treatment process was determined as: 580 °C/1 h solution treatment +150 °C/45 h artificial aging for Al-Li alloy and 505 °C/5 h solution treatment +180 °C/20 h artificial aging for Al-Li-Cu and Al-Li-Cu-Sc alloys.

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Section: Dsc Investigationmentioning

confidence: 99%

“…In Al-Li-Cu-Sc alloys, the addition of Sc promotes the formation of Al 3 Sc precipitates. The formation of the Al 3 Sc phase in Al-Li-Cu-Sc alloys generally occurs at temperatures ranging from approximately 300 • C to 400 • C [33,36]. Figure 8c is the DSC curve for a quenched Al-Li-Cu-Sc alloy specimen.…”

Section: Dsc Investigationmentioning

confidence: 99%