Nucleation of dispersoids study in some Al-Mg-Si alloys

Farh, Hichem; Djemmal, Karim; Guemini, Rebai; Serradj, Farres

doi:10.3166/acsm.35.283-289

Cited by 10 publications

(8 citation statements)

References 14 publications

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“…The observed distribution of dispersoid particles along the same orientation as ' Mg2Si indicated that there is some link between the nucleation of dispersoids and ' Mg2Si phase. All our statements are in good agreements with those obtained by H. Farh et al [10], K. Strobel et al [20] and L. Lodgaard [21] who have reported that these particles are acting as nucleation sites for Mg2Si. Fig.…”

Section: Microstructural Developments During Isothermal Heat Treatmentsupporting

confidence: 93%

“…Dispersoid particles nucleated DOI during the dissolution of ' Mg2Si. They nucleated upon the interface of the hardening phase ' Mg2Si in order to decrease their interfacial energy and to get some of the silicon solute after dissolution of the hardening phases [10,11]. The enhancement of strength properties obtained during the heat treatments is primarily due to the precipitation of metastable phases from the supersaturated solution.…”

Section: Introductionmentioning

confidence: 99%

“…The precipitation reactions in Al-Mg-Si alloys have been the subjects of numerous investigations [17][18][19][20] that are concerned with certain ageing conditions and the effects of chemical composition but ageing temperature and time on the precipitation of various intermediate phases' processes during isothermal heat treatments have not been fully understood. Thus, the main objectives of this work are the study and the investigation of the isothermal heat treatments, with different temperatures and holding times, effects on the microstructure evolution of an Al-Mg-Si alloy by means of conventional transmission electron microscopy (TEM).…”

Section: Introductionmentioning

confidence: 99%

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THE MICROSTRUCTURE DEVELOPMENT DURING ISOTHERMAL HEAT TREATMENT STUDY OF AN Al-Mg-Si ALUMINIUM ALLOY

Ziar

Farh²,

Guemini³

2016

Acta Metall Slovaca

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The effects of isothermal ageing on the microstructure development of an Al-Mg-Si aluminum alloy have been investigated by means of transmission electron microscopy. From micrographs illustrating the micro structural change of the alloy during isothermal ageing ; we can observe in the water quenched alloy sample aged for 50 and 75 hours at 350°C, dispersoid particles that were aligned along <100> matrix direction loosing their distribution at their early stage of precipitation with an increase in holding times. For the microstructure of the alloy ramp heated and aged at 450°C for different holding times, we can clearly see dispersoid particles in their early stages of formation heterogeneously distributed with different shapes after an increase in holding times. These dispersoid particles exhibited strain field contrast when they are heated at low temperatures, that indicating they are coherent or semi-coherent with the matrix. A loss of coherency was observed for most of the dispersoid particles when they were aged with high holding times.

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Section: Microstructural Developments During Isothermal Heat Treatmentsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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THE MICROSTRUCTURE DEVELOPMENT DURING ISOTHERMAL HEAT TREATMENT STUDY OF AN Al-Mg-Si ALUMINIUM ALLOY

Ziar

Farh²,

Guemini³

2016

Acta Metall Slovaca

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“…Dispersoid particles nucleated during the dissolution of b 0 Mg 2 Si. They nucleated upon the interface of the hardening phase b 0 Mg 2 Si in order to decrease their interfacial energy and to get some of the silicon solute after dissolution of the hardening phases [15].…”

Section: Introductionmentioning

confidence: 99%

Study of dispersoid particles in two Al–Mg–Si aluminium alloys and their effects on the recrystallization

Farh

Guemini

2015

Appl. Phys. A

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An investigation has been done to study the effect of heat treatment on the formation and distribution of dispersoid particles in two AlMgSi alloys which contained the transition elements such as Zr and Mn, which have a low solubility in the a-aluminium solid solution and thus form dispersoids. The extrapolation technique of CliffLorimer has been used to determine the chemical composition of dispersoid particles. The aim of this investigation was also to compare the effectiveness of Mn and Zr as dispersoid-forming elements in preventing the recrystallization. The incorporation of Si in the metastable Al 3 Zr type of dispersoid particles could increase the nucleation rate by reducing the volume free energy of formation of the dispersoid particles or decreasing the interfacial energy between the precipitate and the matrix. In these alloys, precipitation hardening occurs at higher temperatures than in conventional age-hardening aluminium alloys.

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“…It has been shown that the addition of transition elements to EN AW 6xxx alloys inhibit recrystallization when the alloys are pre-heated before deformation [8][9][10]. In EN AW 6xxx alloys, the nucleation of the dispersoid particles such as Zr-containing dispersoids, Mn-containing dispersoids, and Cr-containing dispersoids, which play the role of recrystallization inhibition, has been studied [11][12][13][14][15]. The needle-shaped Mn-containing dispersoids formed by using the rapid heating are much more effective than the fine spherical dispersoids formed by using the slow heating for grain refinement during the recrystallization process [16].…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF COLD DEFORMATION AND ANNEALING PHENOMENA ON THE MICROSTRUCTURAL CHANGES AND MICRO-HARDNESS IN Al-Mg-Si ALUMINIUM ALLOYS

Noua

Guemini

Ziar

et al. 2020

Acta Metall Slovaca

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Aluminium alloys are of particular interest because of their low density, low cost and ease of thermo-mechanical processing. During the recent years, much interest has been shown in the development of alloys with optimal mechanical properties which can be retained at high temperatures. The purpose of the present investigation is to study the microstructure of two Al-Mg-Si alloys containing transition elements after cold deformation 10%, 20 %, 30%, 40% and 50% reduction in thickness and annealing at 1 hour at different temperature by using the optical microscopy, transmission electron microscopic (TEM), Vickers hardness measurement. We notice that the micro-hardness increases with the increasing of the deformation level. The coarse particles, with a particle size of about 2 to 3 µm, give rise to a heavily local deformation of the Aluminium matrix. The formation of well-defined substructure due to the arrangement of dislocations is observed after an increase in annealing temperature.

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Nucleation of dispersoids study in some Al-Mg-Si alloys

Cited by 10 publications

References 14 publications

THE MICROSTRUCTURE DEVELOPMENT DURING ISOTHERMAL HEAT TREATMENT STUDY OF AN Al-Mg-Si ALUMINIUM ALLOY

THE MICROSTRUCTURE DEVELOPMENT DURING ISOTHERMAL HEAT TREATMENT STUDY OF AN Al-Mg-Si ALUMINIUM ALLOY

Study of dispersoid particles in two Al–Mg–Si aluminium alloys and their effects on the recrystallization

THE EFFECT OF COLD DEFORMATION AND ANNEALING PHENOMENA ON THE MICROSTRUCTURAL CHANGES AND MICRO-HARDNESS IN Al-Mg-Si ALUMINIUM ALLOYS

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