Continuous cooling precipitation diagrams of Al–Mg–Si alloys

Milkereit, Benjamin; Wanderka, N.; Schick, Christoph; Keßler, Olaf

doi:10.1016/j.msea.2012.04.033

Cited by 159 publications

(150 citation statements)

References 21 publications

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“…EDX showed an enrichment of Mg and Si for these particles. Based on both our experience and the published literature, these are β-Mg 2 Si-phase particles [4,5]. Nucleation of Mg 2 Si is reported to occur on primary Fe, Mn, and Si rich intermetallic particles.…”

Section: Analysis Of the Quench-induced Microstructurementioning

confidence: 74%

“…The solution-annealing temperature was chosen as 540 • C in several previous investigations of the quench sensitivity of AlMgSi alloys [4,5,12]. However, the DSC heating experiments on the particular alloy batch and the initial T651 condition used here (shown in Figure 2), even for slow heating at 0.01 K/s, indicate that dissolution of the secondary precipitates of interest is just completed at about 560 • C. Furthermore, Figure 2 shows that the temperature at which the dissolution of the secondary phases is completed strongly depends on the heating rate.…”

Section: Continuous Heating Of the T651 Initial Conditionmentioning

confidence: 99%

“…The DSC cooling curves of the two different soaking durations are plotted in two colors. The area between a DSC curve peak and its corresponding zero level is proportional to the precipitation enthalpy, and thus the volume fraction, of the precipitates grown during a certain reaction/peak [4]. Figure 3A shows that the DSC curves/reactions are insensitive to the soaking time at 540 • C. Furthermore, a broad high-temperature reactions (HTRs) peak dominates, even at high cooling rates.…”

Section: Continuous Heating Of the T651 Initial Conditionmentioning

confidence: 99%

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Influence of Solution-Annealing Parameters on the Continuous Cooling Precipitation of Aluminum Alloy 6082

Fröck

Milkereit

Wiechmann

et al. 2018

Metals

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Abstract:We use a systematic approach to investigate the influence of the specific solution condition on quench-induced precipitation of coarse secondary phase particles during subsequent cooling for a wide range of cooling rates. Commercially produced plate material of aluminum alloy EN AW-6082 was investigated and the applied solution treatment conditions were chosen based on heating differential scanning calorimetry experiments of the initial T651 condition. The kinetics of the quench-induced precipitation were investigated by in situ cooling differential scanning calorimetry for a wide range of cooling rates. The nature of those quench-induced precipitates was analyzed by electron microscopy. The experimental data was evaluated with respect to the detrimental effect of incomplete dissolution on the age-hardening potential. We show that if the chosen solution temperature and soaking duration are too low or short, the solution treatment results in an incomplete dissolution of secondary phase particles. This involves precipitation during subsequent cooling to start concurrently with the onset of cooling, which increases the quench sensitivity. However, if the solution conditions allow the formation of a complete solid solution, precipitation will start after a certain degree of undercooling, thus keeping the upper critical cooling rate at the usual alloy-specific level.

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Section: Analysis Of the Quench-induced Microstructurementioning

confidence: 74%

Section: Continuous Heating Of the T651 Initial Conditionmentioning

confidence: 99%

Section: Continuous Heating Of the T651 Initial Conditionmentioning

confidence: 99%

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Influence of Solution-Annealing Parameters on the Continuous Cooling Precipitation of Aluminum Alloy 6082

Fröck

Milkereit

Wiechmann

et al. 2018

Metals

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“…the microchemical composition of the matrix and the corresponding precipitation state, differential scanning calorimetry (DSC) measurements are of great importance. It was shown in [18,19] that the precipitation heat (enthalpy change) is directly proportional to the volume fraction of precipitated particles, which allows in principle a calculation of remaining solute amount in dependence of cooling rate and temperature [20].…”

mentioning

confidence: 99%

“…Therefore, precipitation kinetics of low-Si binary Al-Si alloys during cooling from solution annealing are investigated in a wide cooling rate range with advanced DSC techniques (e.g. [18,[21][22][23][24][25][26][27][28]). Direct DSC cooling experiments are limited to a certain slow cooling rate due to the relation between sample mass, cooling rate and heat flow.…”

mentioning

confidence: 99%

Quench-induced precipitates in Al–Si alloys: Calorimetric determination of solute content and characterisation of microstructure

et al. 2015

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The present study introduces an experimental approach to investigate mechanical properties of well-defined nonequilibrium states of Al-Si alloys during cooling from solution annealing. The precipitation behaviour of binary Al-Si alloys during the cooling process has been investigated in a wide cooling rate range (2 K/s-0.0001 K/s) with differential scanning calorimetry (DSC). To access the low cooling rate range close to equilibrium an indirect DSC measurement method is introduced. Based on the enthalpy change measured by DSC a physically-based model for the calculation of remaining solute Si amount as function of temperature and cooling rate is presented.Microstructural analyses via light optical microscopy, scanning electron microscopy, atom probe tomography 50 and X-ray diffraction have been performed to evaluate the introduced model and for information on cooling rate dependent precipitate formation. It was found that quench-induced particles of different morphology are formed during cooling. Thermomechanical analyses on clearly distinct undercooled Al-Si states show that flow stress during cooling is dependent on temperature as well as cooling rate. The mechanical behaviour is therefore influenced by solute Si content and quench-induced precipitates.

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Advanced Dilatometry and Calorimetry for the Validation of Materials Mechanical and Transformation Models

Reich

Milkereit

Krawutschke

et al. 2013

2^ndWorld Congress on Integrated Computational Materials Engineering

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Continuous cooling precipitation diagrams of Al–Mg–Si alloys

Cited by 159 publications

References 21 publications

Influence of Solution-Annealing Parameters on the Continuous Cooling Precipitation of Aluminum Alloy 6082

Influence of Solution-Annealing Parameters on the Continuous Cooling Precipitation of Aluminum Alloy 6082

Quench-induced precipitates in Al–Si alloys: Calorimetric determination of solute content and characterisation of microstructure

Advanced Dilatometry and Calorimetry for the Validation of Materials Mechanical and Transformation Models

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