PRECIPITATION AND RECRYSTALLIZATION IN Al Mn ALLOYS

Diallo, Chérif; Mondino, M.; Benoît, W.

doi:10.1051/jphyscol:19815148

Cited by 3 publications

(10 citation statements)

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“…Knowing ⌬S i and ␣ i and using Eq. [4], we can determine the values of c i that reproduce the measured TEP values.…”

Section: Theoretical Detailsmentioning

confidence: 92%

“…[3] and [4], we can deduce the rule of Nordheim-Gorter, which allows us to determine the influence that extra impurities in the matrix have upon the relative diffusional TEP, ⌬S d :…”

Section: Theoretical Detailsmentioning

confidence: 99%

“…It is useful to cite the works of Goel et al, [1,2] Nes and Embury, [3] Diallo et al, [4] Kiss et al, [5] and Howe [6] related to recrystallization and precipitation of Al-Mn alloys. All of these authors use direct and indirect techniques to determine the kinetics and magnitude of the precipitation as well as the identification of precipitates.…”

Section: Introductionmentioning

confidence: 99%

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Isothermal precipitation of commercial 3003 Al alloys studied by thermoelectric power

Luiggi

1997

Metall Mater Trans B

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We have used thermoelectric power (TEP) techniques to study the precipitation process in samples of cold-rolled commercial 3003 Al alloys, in which we guarantee the initial microstructure by diverse thermal treatments. Kinetics are obtained, isothermally, at several aging temperatures, proving that the manganese impurity controls the precipitation process. The Nordheim-Gorter rule is used to determine the effect of impurities on the diffusional TEP, permitting us to know the amount of Mn in solid solution for the diverse work conditions. The time-temperature-transformation (TTT) curves, obtained from the isothermal kinetics plots, indicate the existence of different precipitate phases which depend upon the thermal treatment applied to the sample. For homogenized samples, the observed behavior was associated to an equilibrium phase with a nose toward 540 ЊC and with an activation energy of (41 ‫ע‬ 2) Kcal/mol. For strained samples, we observe a metastable phase with an activation energy of (19 ‫ע‬ 2) Kcal/mol and also a stable phase with an activation energy similar to the one obtained for the homogenized samples. For as-cast and as-cast-heated samples, we predict the existence of two precipitated phases, the activation energy of the precipitated phase at low temperature being (31 ‫ע‬ 2) Kcal/mol. The energy of the second phase seems to be the same for all microstructural conditions. The results obtained for the stable phase agree with the results reported in the literature.

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“…Knowing ⌬S i and ␣ i and using Eq. [4], we can determine the values of c i that reproduce the measured TEP values.…”

Section: Theoretical Detailsmentioning

confidence: 92%

“…[3] and [4], we can deduce the rule of Nordheim-Gorter, which allows us to determine the influence that extra impurities in the matrix have upon the relative diffusional TEP, ⌬S d :…”

Section: Theoretical Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isothermal precipitation of commercial 3003 Al alloys studied by thermoelectric power

Luiggi

1997

Metall Mater Trans B

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“…But they are not well suited to the study of the dynamlcal interactions between the dislocations and the second phase particles. Therefore, Diallo [63,64,65] has studied the recrystallization in A1-Mn alloys by means of internal friction measurements, and obtained the following results. Theheavalydeformed Al-0.5 to 2wt% Mn alloys present, during isochronal annealings, two main stages in the evolution of the internal friction spectrum ( fig.…”

Section: Recrystallization In A1-mn Alloysmentioning

confidence: 99%

“…This mechanism does not require the formation of subgrains during the recovery stage. It would be interesting to study more in details the different modes of nucleation of the new grains by the method developed by Diallo et al [63 to 651.…”

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confidence: 99%

Internal Friction Associated With Precipitation and Recrystallization

Schaller

Benoît

1983

J. Phys. Colloques

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Résumé -L'étude de la précipitation dans les alliages à base d'Al et de Cu par mesures de frottement intérieur montre que les stades de précipitation peuvent être détectés par l'apparition ou la disparation de pics de relaxation qui sont dus soit à la solution solide (pics de Zener) soit aux précipités. Pendant longtemps, il a été admis que tous les pics dus aux précipités avaient la même origine, c'est-à-dire étaient dus à des relaxations anélastiques aux interfaces précipités-matrice (théorie de Schoeck) . En fait le problème est plus complexe. Les caractéristiques des pics de précipités peuvent être diffé-rentes d'un alliage à l'autre. -Des résultats ont été obtenus qui rendent compte de relaxations à l'intérieur des précipités ou encore de mécanismesd'interactions dislocations-précipités. L'évolution du réseau de dislocations au cours de la recristallisation modifie profondément les valeurs du frottement intérieur. En particulier, on observe que la recristallisation apparaît après un accroissement du frottement inté-rieur. Ce résultat apporte un nouveau critère de recristallisation : la recristallisation est conditionnée par un accroissement de la mobilité des dislocations. De ce point de vue, le frottement intérieur devient une des meilleures méthodes pour étudier les interactions précipitation-recristallisation.Abstract -The study of precipitation in Al and Cu based alloys by internal friction measurements shows that the precipitation stages can be revealed by the appearance or disappearance of relaxation peaks due either to the solid solutions (Zener peaks) or to the precipitates. For a long time, it has been thought that all the peaks due to the precipitates have the same origin/ i.e. are due to anelastic relaxations at the boundaries of the precipitates (Schoeck's theory). It is shown that the problem is more complex. The characteristics of these "precipitates peaks" can be different depending on the alloy. Some results, which give an account for relaxations inside the precipitates and also for mechanisms of interactions between dislocations and precipitates, have been obtained. The evolution of -the dislocations network during recrystallization modifies strongly the values of the internal friction background. In particular, the results show that recrystallization occurs after an increase of the internal friction. This leads to a new criterion for recrystallization .: recrystallization is conditioned by the increase of the dislocations mobility. From this point of view, internal friction seems to be one of the better method for studying the interactions between precipitation and recrystallization.

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