A differential scanning calorimetric study of phase stability in 2091(AlLiCuMgZr) alloy submitted to welding operations

Macedo, M.C de; Avillez, Roberto R. de; Solórzano, I. G.

doi:10.1016/0956-716x(94)90467-7

Cited by 9 publications

(2 citation statements)

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“…The cluster, zone and d9 (Al 3 Li) dissolution occurs in the range 180-230uC, 20 and S formation occurs at 230-300uC. 4 At about 390uC, an additional peak appears, which is thought to be due to T2 formation 21,22 (in some publications the T2 phase has been termed the I phase). The endothermic T2 and S dissolution effects appear in the range of 400-500uC.…”

Section: Dsc Analysismentioning

confidence: 99%

“…On the basis of this, the pronounced and distinct endothermic dissolution effect within 80-170uC that was present in DSC curves of SQRST alloys, but not present for alloys aged at 150uC and 190uC (Figs. 11 and 12 respectively), is likely to be due to the dissolution of the fine homogeneously precipitated d9, 20,22,37,38 that formed during the room temperature ageing. Also the dissolution of Li bearing zones has been considered, 39,40 but little evidence for their existence exists, and the present results are consistent with Li precipitating to form L1 2 ordered d9 phase with a Li content that is slightly lower than the stoichiometric one (Al 3 Li).…”

Section: Precipitation and Strengtheningmentioning

confidence: 99%

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Microstructure and precipitation in Al–Li–Cu–Mg–(Mn, Zr) alloys

Gao¹,

Starink²,

Davin³

et al. 2005

Materials Science and Technology

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Hot rolled Al-6Li-1Cu-1Mg-0.2Mn (at.%) (Al-1.6Li-2.2Cu-0.9Mg-0.4Mn, wt.%) and Al-6Li-1Cu-1Mg-0.03Zr (at.%) (Al-1.6Li-2.3Cu-1Mg-0.1Zr, wt.%) alloys developed for age forming were studied by tensile testing, electron backscatter diffraction (EBSD), three-dimensional atom probe (3DAP), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). For both alloys, DSC analysis shows that ageing at 150°C leads initially to formation of zones/clusters, which are later gradually replaced by S phase. On ageing at 190°C, S phase formation is completed within 12 h. The precipitates identified by 3D atom probe and TEM can be classified into (a) Li-rich clusters containing Cu and Mg, (b) a plate-shaped metastable precipitate (similar to GPB2 zones/S''), (c) S phase and (d) δ' spherical particles rich in Li. The Zr containing alloy also contains β' (Al 3 Zr) precipitates and composite β'/δ' particles. The β' precipitates reduces recrystallisation and grain growth leading to fine grains and subgrains.

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Section: Dsc Analysismentioning

confidence: 99%

Section: Precipitation and Strengtheningmentioning

confidence: 99%

Microstructure and precipitation in Al–Li–Cu–Mg–(Mn, Zr) alloys

Gao¹,

Starink²,

Davin³

et al. 2005

Materials Science and Technology

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Calorimetric studies of 8090 and 1441 Al–Li–Cu–Mg–Zr alloys of conventional and retrogressed and reaged tempers

2007

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Kinetics of Solid-State Reactions in Al-Li-Cu-Mg-Zr Alloys from Calorimetric Studies

Ghosh

Das

Chatterjee

2007

Metall Mater Trans A

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Differential scanning calorimetric (DSC) studies at different heating rates have been carried out to examine the solid-state reactions in 1441 and 8090 Al-Li-Cu-Mg-Zr alloys of water-quenched (WQ) and retrogressed tempers. The DSC peaks indicating the reactions sequence such as formation of GPB zones, precipitations of d¢ phase, dissolution of GPB zones and d¢ precipitates, and precipitations of S¢, T 1 , T 2 , and d phases have been identified. From the heat flow associated with the peaks of the thermograms, the fraction transformation (Y), the rate of transformation (dY/dt), the activation energy (Q*), the frequency factor (k 0 ), and the transformation function f(Y) for all the reactions of the 1441 and 8090 alloys have been determined. The appearance of separate peaks of GPB zone formation and d¢ precipitation in the 1441 alloy of retrogressed tempers has enabled determination of the kinetic parameters, which is otherwise not possible from the thermograms of the WQ state due to peak overlapping, by varying heating rate method. The kinetic parameters determined from the DSC data of all the reactions of the alloys are in good agreement with the previously published data.

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A differential scanning calorimetric study of phase stability in 2091(AlLiCuMgZr) alloy submitted to welding operations

Cited by 9 publications

References 1 publication

Microstructure and precipitation in Al–Li–Cu–Mg–(Mn, Zr) alloys

Microstructure and precipitation in Al–Li–Cu–Mg–(Mn, Zr) alloys

Calorimetric studies of 8090 and 1441 Al–Li–Cu–Mg–Zr alloys of conventional and retrogressed and reaged tempers

Kinetics of Solid-State Reactions in Al-Li-Cu-Mg-Zr Alloys from Calorimetric Studies

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