Calorimetric study of pre-precipitation and precipitation in Al-Mg alloy

Nebti, Samia; Hamana, D.; Cizeron, G.

doi:10.1016/0956-7151(95)00023-o

Cited by 94 publications

(55 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was suggested that the 00 (short-range ordered Al 3 Mg or AlMg) phase previously reported 5) may in fact correspond to GP zones, while that designated 0 (long-range ordered Al 3 Mg or AlMg) phase was an intermediate 00 phase with an ordered L1 2 structure. More recent studies 7,8) using DSC have tended to confirm that the decomposition process of the supersaturated solid solution in the Al-Mg alloys with 11-16 mass% Mg aged at 20 C is consistent with the previously reported result, 5,6) and is as shown below:…”

Section: Introductionsupporting

confidence: 77%

“…It should be noted that the precipitate phase identified to be having the ordered L1 2 structure is considered as the 00 phase (Al 3 Mg, the ordered cubic L1 2 structure) based on both present electron diffraction evidence and results reported previously. 7,19,25) Similar electron diffraction patterns, which have the L1 2 type superlattice Al 3 Mg phase, was also observed in liquidquenched Al-21.2Mg and 26.2Mg (at.%) alloys aged at 100 C for 20 and 40 min. 26) Although the lattice parameter of this superlattice structure was not reported, this previously reported ordered L1 2 type superlattice structure in liquidquenched binary alloys might be the same as one observed in the present experimental ternary Al-10Mg-0.5Ag (mass%) alloy.…”

Section: Effects Of Natural Ageing On Precipitation Sequencesmentioning

confidence: 62%

“…1(d)-(f)). It should be noted that the precipitate phase, having the ordered cubic L1 2 structure has a structure fully consistent with the metastable 00 phase, that has been reported 7) previously in the Al-Mg system and has a composition of Al 3 Mg.…”

Section: Microstructural Characterisation Aged At Roommentioning

confidence: 85%

“…Based on these previously-reported results, [1][2][3][4][5][6][7][8] it is widely accepted that the approximate formation and dissolution temperatures of the various phases within alloys in this composition range have also been determined to be as follows: formation of GP zones (0 C) and 00 phase (45 C); dissolution of GP zones and 00 (40-100 C); formation of 0 phase (100 C) and phase (250 C); and dissolution of 0 and phases (250-420 C). To date the majority of experimental studies of the decomposition process in Al-Mg alloys (with typically more than 7 mass% Mg) have been conducted using indirect (nonmicroscopic) techniques, such as DSC, electrical resistivity measurements and neutron scattering experiments.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterisation of Precipitate Microstructures of Natural and Artificial Ageing in Al-Mg(-Ag) Alloys

Kubota¹

2005

Mater. Trans.

View full text Add to dashboard Cite

In order to improve fundamental understanding of the ageing behaviour in Al-Mg(-Ag) alloys, the effects of trace additions of Ag on the precipitate microstructures of the Al-Mg alloys aged at temperature range 20 and 90 C was examined. The fine-scale and uniformly distributed spheroidal precipitate particles were formed in the ternary Al-10Mg-0.5Ag (mass%) alloy during the natural ageing process of periods of 16 months, while no precipitate particles were observed in the binary Al-10 mass% Mg alloy under the same ageing conditions. These fine scale, spheroidal precipitate particles observed in the ternary Al-10Mg-0.5Ag (mass%) alloy were identified as the 00 phase which has the ordered L1 2 structure with the lattice parameter of a ¼ 0:408 nm. The orientation relationship between the 00 phase and the aluminium matrix was of the form: ð100Þ L12 k ð100Þ , ½001 L12 k ½001 . The spheroidal precipitate particles having the ordered L1 2 structure in the Ag-modified alloys were unstable when the specimen was aged at 90 C. The plate-like precipitate particles were formed in binary alloys aged from 30 days at 90 C. The plate-like particles had habit planes of f100g , and were identified as the 0 phase which is consistent with the metastable 0 phase (Al 3 Mg 2 , a ¼ 1:002 nm, c ¼ 1:636 nm) in Al-Mg alloys.

show abstract

Section: Introductionsupporting

confidence: 77%

Section: Effects Of Natural Ageing On Precipitation Sequencesmentioning

confidence: 62%

Section: Microstructural Characterisation Aged At Roommentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterisation of Precipitate Microstructures of Natural and Artificial Ageing in Al-Mg(-Ag) Alloys

Kubota¹

2005

Mater. Trans.

View full text Add to dashboard Cite

show abstract

“…Although different symbols for the zones and phases have been used, most work on the precipitation in Al-Mg [1,2,3,4] [4,7], it is the main hardening precipitate [8], and β is the equilibrium phase (approximate composition Al 3 Mg 2 ) having an FCC structure with a = 2.824 nm [4,7]. When solid solutions with up to 17 mass%Mg are aged at temperatures in excess of about 110°C no L1 2 ordered structures or zones form.…”

Section: Introductionmentioning

confidence: 99%

Precipitation Kinetics of an Al-15% Mg Alloy Studied by Microcalorimetry and TEM

Starink

Zahra²

1996

MSF

View full text Add to dashboard Cite

The kinetics of β′ formation from supersaturated Al-15mass%Mg solid solutions was studied by microcalorimetry and transmission electron microscopy (TEM). It is shown that the transformation can not be described by the commonly used equation:The function f(α) is different at different temperatures. Apparent activation energies decrease with amount transformed from 1.07 eV to 0.7 eV. These findings are discussed in terms of overlapping of the nucleation and growth processes for β′. IntroductionAlthough different symbols for the zones and phases have been used, most work on the precipitation in Al-Mg [1,2,3,4] [4,7], it is the main hardening precipitate [8], and β is the equilibrium phase (approximate composition Al 3 Mg 2 ) having an FCC structure with a = 2.824 nm [4,7]. When solid solutions with up to 17 mass%Mg are aged at temperatures in excess of about 110°C no L1 2 ordered structures or zones form. In solid-quenched and liquid-quenched Al-Mg aged between about 110°C and 250°C the β′ phase forms first and the β phase only appears in the later stages of ageing when the Mg depletion of the matrix is nearly completed [4,9].In the present work the kinetics of precipitation in an Al-15mass%Mg alloy was studied by TEM and microcalorimetry. The latter technique allows the determination of the progress of the reaction at constant temperature with a very high precision. ExperimentalA high purity alloy with nominal composition Al-15Mg was produced by conventional casting and subsequent rolling at Centre de Recherches de Voreppe (Aluminium Pechiney). Chemical analysis revealed the composition 14.5 ± 0.2 mass % Mg (corresponding to 15.8 at %), with typical total impurity content about 0.03 mass % (mainly Si). The grain size is very large: about 1 to 2 mm.

show abstract

Effects of Different Temper and Aging Temperature on the Precipitation Behavior of Al 5xxx Alloy

Yi¹,

Cullen²,

Derrick³

et al. 2015

Light Metals 2015

View full text Add to dashboard Cite

Calorimetric study of pre-precipitation and precipitation in Al-Mg alloy

Cited by 94 publications

References 10 publications

Characterisation of Precipitate Microstructures of Natural and Artificial Ageing in Al-Mg(-Ag) Alloys

Characterisation of Precipitate Microstructures of Natural and Artificial Ageing in Al-Mg(-Ag) Alloys

Precipitation Kinetics of an Al-15% Mg Alloy Studied by Microcalorimetry and TEM

Effects of Different Temper and Aging Temperature on the Precipitation Behavior of Al 5xxx Alloy

Contact Info

Product

Resources

About