Precipitation kinetics of the hardening phase in two 6061 aluminium alloys

Aouabdia, Youcef; Boubertakh, A; Hamamda, S.

doi:10.1016/j.matlet.2009.11.014

Cited by 24 publications

(16 citation statements)

References 26 publications

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“…3b. That might explain why such methods have been applied in numerous papers [3,4,[15][16][17] for determining Q for the precipitation of β″. However, this analysis may be inaccurate, if performed with Φ low enough to influence the precipitation of β″.…”

Section: Resultsmentioning

confidence: 99%

“…Differential scanning calorimetry (DSC) has been widely used to study the precipitation process in Al-Mg-Si alloys [1][2][3][4][5][6][7][8]. Most of these experiments involve linear heating and are started below or around room temperature (RT).…”

Section: Introductionmentioning

confidence: 99%

“…Most of these experiments involve linear heating and are started below or around room temperature (RT). In general there are two basic types of experiment: (i) those starting directly after quenching [2][3][4]; or (ii) those starting after some pre-aging treatment and thus taking into account the influence of RT storage on precipitation kinetics [5,7,9]. For most rich Al-Mg-Si alloys a storage period longer than a few minutes after quenching has been shown to strongly retard the precipitation kinetics of the major strengthening phase β″ formed during artificial aging [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon is commonly called 'negative effect' and has significant industrial importance because it reduces kinetics and achievable strength during artificial aging [11,12]. Several studies have investigated the precipitation sequence directly measured after quenching by DSC [2][3][4], but none have investigated or even considered the potential impact of processes occurring in the low temperature region during DSC measurements, which are somehow comparable to the effect of RT storage on the precipitation of β″. The present work addresses this topic by studying the commercially important alloy AA6061, chosen because of its well-known precipitation sequence originally determined by DSC [1] (super saturated solid solution-clustering stage-Mg,Si co-clusters-GP-I zones-β″-B′, β′-β-Mg 2 Si).…”

Section: Introductionmentioning

confidence: 99%

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Influence of starting temperature on differential scanning calorimetry measurements of an Al–Mg–Si alloy

2013

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of starting temperature on differential scanning calorimetry measurements of an Al–Mg–Si alloy

2013

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“…Significant achievements in the characterization of the precipitation behavior of AlMgSi alloys have been reached since the end of last centenary, with the assistance of advancing technologies, like High Resolution Transmission Electron Microscopy (HRTEM) [5][6][7][10][11][12][13], Atom Probe Tomography (APT) [1,[13][14][15][16][17], Differential Scanning Calorimetry (DSC) [18][19][20], electrical resistivity measurements [21][22][23][24][25][26], Phase Field Crystal (PFC) modeling [4,24], etc. The precipitation sequence has been established and gradually accepted as: supersaturated solid solution (SSSS)→clusters/GP…”

Section: Introductionmentioning

confidence: 99%

Precipitation Stages and Reaction Kinetics of AlMgSi Alloys during the Artificial Aging Process Monitored by In-Situ Electrical Resistivity Measurement Method

Zhang

et al. 2018

Metals

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The precipitation process and reaction kinetics during artificial aging, precipitate microstructure, and mechanical properties after aging of AlMgSi alloys were investigated employing in-situ electrical resistivity measurement, Transmission Electron Microscopy (TEM) observation, and tensile test methods. Three aging stages in sequence, namely formation of GP zones, transition from GP zones to β" phase, transition from β" to β phase, and coarsening of both phases, were clearly distinguished by the variation of the resistivity. It was discussed together with the mechanical properties and precipitate morphology evolution. Fast formation of GP zones and β" phase leads to an obvious decrease of the resistivity and increase of the mechanical strength. The formation of β" phase in the second stage, which contributes to the peak aging strength, has much higher reaction kinetics than reactions in the other two stages. All of these stages finished faster with higher reaction kinetics under higher temperatures, due to higher atom diffusion capacity. The results proved that the in-situ electrical resistivity method, as proposed in the current study, is a simple, effective, and convenient technique for real-time monitoring of the precipitation process of AlMgSi alloys. Its further application for industrial production and scientific research is also evaluated. of 12zones→β"→β →β [27]. The clusters/GP zones are the early stage precipitates with size of several nanometers, usually formed during natural aging or first minutes of artificial aging process. β" and β phases are formed in the artificial aging process before over ageing. β is the final stable phase. The AlMgSi alloys are usually strengthened by the meta-stable phases. However, debates in this field still remain. For example, detailed crystal structure and composition of the meta-stable phases, precipitation kinetics that is quite related to the natural aging effect, quantitative characterization of the precipitates is under debate [13][14][15][16]. The atomic structure and evolution of the early clusters are ambiguous yet [5][6][7]. Characterization accuracy and effectiveness are still dependent on the methods. Therefore, the investigation on the details of the precipitation process is still in progress.Recently reported investigations proved that the electrical resistivity measurement method is feasible and convenient for quantitative analysis of the reaction kinetics and precipitate volume fraction in AlMgSi alloys [21,25,26]. When compared to the TEM, APT, and DSC techniques, its merits are: (i) it is sensitive due to the high sensitivity of resistivity to even atomic-scale changes of the microstructure, such as solution atoms, defects, precipitates; (ii) there are no need of complicated sample preparation or sophisticated equipments like TEM system; and, (iii) samples used are much larger than those for HRTEM, APT or DSC, so that the accuracy would be better [26]. The existing resistivity investigations of AlMgSi alloys were mostly conducted after aging and sample...

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ChemInform Abstract: Precipitation Kinetics of the Hardening Phase in Two 6061 Aluminium Alloys

2010

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Precipitation kinetics of the hardening phase in two 6061 aluminium alloys

Cited by 24 publications

References 26 publications

Influence of starting temperature on differential scanning calorimetry measurements of an Al–Mg–Si alloy

Influence of starting temperature on differential scanning calorimetry measurements of an Al–Mg–Si alloy

Precipitation Stages and Reaction Kinetics of AlMgSi Alloys during the Artificial Aging Process Monitored by In-Situ Electrical Resistivity Measurement Method

ChemInform Abstract: Precipitation Kinetics of the Hardening Phase in Two 6061 Aluminium Alloys

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