The effect of minor solute additions on the precipitation path of an Al Cu Li alloy

Gumbmann, E.; Lefebvre, W.; Geuser, F. de; Sigli, Christophe; Deschamps, A.

doi:10.1016/j.actamat.2016.05.050

Cited by 157 publications

(44 citation statements)

References 43 publications

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“…Marceau and co-workers (Marceau, Sha, Ferragut et al, 2010) pointed to these clusters having an Mg:Cu ratio > $ 2 on the basis of APT and highlighted the importance of Mg as a potential vacancy stabilizer through the formation of vacancy-Mg complexes, as reported by Nagai et al (2001). Furthermore, minor Mg additions have been shown to modify considerably the precipitation sequence and kinetics of complex commercial Al-Cu-Li alloys by changing the lowtemperature microstructure formed during the early stages of ageing (Araullo-Peters et al, 2014;Gumbmann et al, 2016). Decreus et al (2013) showed, using anomalous small-angle X-ray scattering (ASAXS), that Cu-rich clusters exist after natural ageing in an Al-Cu-Li-Mg alloy.…”

Section: Introductionmentioning

confidence: 88%

A combined characterization of clusters in naturally aged Al–Cu–(Li, Mg) alloys using small-angle neutron and X-ray scattering and atom probe tomography

2017

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A new methodology for the characterization of solute clusters leading to compositional fluctuations is presented and discussed. The methodology makes use of contrast variation arising from a combination of small‐angle scattering using neutrons and X‐rays, and adapts a model for solute correlation to extract the chemistry and length scale of clustered states after quench and after natural ageing. In three subsets of the Al–Cu system, Cu‐rich clusters are reported for all cases. The presence of Mg strongly enhances Cu clustering in the naturally aged state and results in more than double the number of clusters in the complex Al–Cu–Li–Mg system. The results are compared with those obtained using atom probe tomography.

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Section: Introductionmentioning

confidence: 88%

A combined characterization of clusters in naturally aged Al–Cu–(Li, Mg) alloys using small-angle neutron and X-ray scattering and atom probe tomography

2017

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“…Al-Cu-Li-Mg alloys have been the object of intensive research in the last 10 years for aerospace applications [61,62]. Despite considerable work devoted to describing the precipitation sequence in these alloys as a function of thermo-mechanical history and alloy composition [63][64][65][66][67][68][69][70][71][72]43,[73][74][75][76][77], the study of natural ageing has been so far quite limited. In the high Li-containing alloys developed initially, most of the low-temperature phenomena have been identified to precipitation of the '-Al 3 Li phase [78,79].…”

Section: Introductionmentioning

confidence: 99%

Clustering kinetics during natural ageing of Al-Cu based alloys with (Mg, Li) additions

2018

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Room temperature solute clustering in aluminium alloys, or natural ageing, despite its industrial relevance, is still subject to debate, mostly due to its experimentally challenging nature. To better understand the complex multi-constituents' interactions at play, we have studied ternary and quaternary subsystems based on the Al-Cu alloys, namely Al-Cu-Mg, Al-Cu-Li and Al-Cu-Li-Mg. We used a recently introduced correlative technique using small-angle neutrons and X-ray scattering (SANS and SAXS) to extract the chemically resolved kinetics of room temperature clustering in these alloys, which we completed with differential scanning calorimetry (DSC) and micro-hardness measurements.The comparison of the clustering behaviours of each subsystem allowed us to highlight the paramount role of Mg as a trigger for diffusion and clustering. Indeed, while a strong natural ageing was observed in the Al-Cu-Mg alloy, virtually none was shown for Al-Cu-Li. A very slight addition of Mg (0.4%) to this system, however, drastically changed the situation to a rapid formation of essentially Cu-rich hardening clusters, Mg only joining them later in the reaction. This diffusion enabling effect of Mg is discussed in terms of diffusion mechanism and complex interactions with the quenched-in vacancies.

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“…Due to the great effort of aircraft and aluminum industries, Al–Cu–Li alloy has been developed as an alternative solution. The attractive properties of the alloy is associated with the addition of Li, which not only results in significant weight reduction but also enable the alloy to attain higher elastic modulus, lower density, higher specific strength, and more favorable damage tolerance properties compared with that of traditional 2xxx and 7xxx series Al alloy …”

Section: Introductionmentioning

confidence: 99%

Influences of Friction Stir Welding and Post‐Weld Heat Treatment on Al–Cu–Li Alloy

Lin

Wei

et al. 2017

Adv Eng Mater

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In this paper, the influences of friction stir welding (FSW) and post-weld heat treatment (PWHT) on the microstructures and tensile properties of Al-Cu-Li alloy are investigated. After FSW, strengthen loss occurred in the welding area. Remarkable softening occurs in the thermo-mechanically affected zone (TMAZ) resulting from dissolution of Al 3 Li (δ 0 ) phases. Recrystallization and precipitation of ultra-fine δ 0 phases take place in the nugget zone (NZ) that lightens the softening degree of this zone. A noteworthy enhancement in the hardness and tensile strength of the joint is achieved after T8 reaging treatment (3% À pre-deformation, 30 h at 152 C). However, re-solution treatment coupled with re-aging treatment leads to ductility deterioration in the joint because coplanar slip of coarse Al 3 Li phases induces severe stress concentration during plastic deformation.

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The effect of minor solute additions on the precipitation path of an Al Cu Li alloy

Cited by 157 publications

References 43 publications

A combined characterization of clusters in naturally aged Al–Cu–(Li, Mg) alloys using small-angle neutron and X-ray scattering and atom probe tomography

A combined characterization of clusters in naturally aged Al–Cu–(Li, Mg) alloys using small-angle neutron and X-ray scattering and atom probe tomography

Clustering kinetics during natural ageing of Al-Cu based alloys with (Mg, Li) additions

Influences of Friction Stir Welding and Post‐Weld Heat Treatment on Al–Cu–Li Alloy

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