CALPHAD modeling of metastable phases in the Al–Mg–Si system

Povoden-Karadeniz, Erwin; Lang, Peter; Warczok, Piotr; Falahati, Ahmad; Wu, Jun; Kozeschnik, Ernst

doi:10.1016/j.calphad.2013.03.004

Cited by 54 publications

(33 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermodynamic properties of these metastable phases were calculated using first-principles simulations. Povoden-Karadeniz et al [28] proposed another set of metastable phases, namely Mg5Si6 (β''), Mg1.8Si (β'), Al3Mg9Si7 /Al3Mg8Si7…”

Section: Interfacial Phase Compositionsmentioning

confidence: 99%

“…represented by Mg9Al3Si7, MgAl2Si2 and MgAlSi, respectively, were taken from PovodenKaradeniz et al [28]. The thermodynamic descriptions of the stable phases in the Al-Mg-Si system were taken from the COST507 database.…”

Section: Interfacial Phase Compositionsmentioning

confidence: 99%

“…This is due to its mathematical simplicity and convenient coupling with the CALPHAD database, enabling an efficient treatment of multi-scale, multi-component industrially significant problems [14][15][16][17][18][19][20][21][22][23][24][25]. It should be noted that the coupling of the KWN model with the thermodynamic databases developed in the CALPHAD research community is a scale-bridging feature as the databases could be established on the base of first principle calculations [27,28]. It has been pointed out by Kozeschnik et al that the coupling with the CALPHAD could bring the KWN approach's predictive power to a tuning parameter free level [29].…”

Section: Introductionmentioning

confidence: 99%

“…It should also be mentioned that rapid progress in the CALPHAD community on thermodynamic databases for metastable and stable phases, i.e. the work reported in [27,28] on Al-Mg-Si alloy system, enables the applications of the KWN model to industrial alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The coupling of the extended model with the reported CALPHAD databases [27,28] will be implemented. Then the new model will be applied to predict the post-β'' microstructural evolution during over-ageing of Al-Mg-Si alloys.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Modeling over-ageing in Al-Mg-Si alloys by a multi-phase CALPHAD-coupled Kampmann-Wagner Numerical model

Tang

Marioara

et al. 2017

Acta Materialia

View full text Add to dashboard Cite

The formation of the equilibrium precipitation phase during ageing treatment of Al-Mg-Si alloys is preceded by a series of metastable phases. Given inappropriate ageing time, higher ageing temperature or elevated temperature service condition, β'', the main hardening phase, would be replaced by the more stable metastable phases such as β', B', U1 and U2. The post-β'' microstructure evolution, called "over-ageing", leads to a steep drop in the hardness evolution curve. This paper aims to predict directly over-ageing in Al-Mg-Si alloys by extending a CALPHAD-coupled Kampmann-Wagner Numerical framework towards handling the coexistence of several types of stoichiometric particles of different phases. We demonstrate how the proposed modeling framework, calibrated with a limited amount of experimental measurement data, can aid in understanding the precipitation kinetics of a mix of different types particles.Simulation results will be presented for some earlier reported transmission electron microscopy measurements [1] to shed light on how the alloy composition and ageing treatment influence the post-β'' phase selection.

show abstract

Section: Interfacial Phase Compositionsmentioning

confidence: 99%

Section: Interfacial Phase Compositionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling over-ageing in Al-Mg-Si alloys by a multi-phase CALPHAD-coupled Kampmann-Wagner Numerical model

Tang

Marioara

et al. 2017

Acta Materialia

View full text Add to dashboard Cite

show abstract

Precipitation and Dissolution Kinetics in Metallic Alloys with Focus on Aluminium Alloys by Calorimetry in a Wide Scanning Rate Range

Milkereit

Keßler

Schick

2016

Fast Scanning Calorimetry

View full text Add to dashboard Cite

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

Myhr

Grong

Schäfer

2015

Metall Mater Trans A

View full text Add to dashboard Cite

In this article, a new age-hardening model for Al-Mg-Si alloys is presented (named NaMo-Version 2), which takes into account the combined effect of cold deformation and prolonged room-temperature storage on the subsequent response to artificial aging. As a starting point, the original physical framework of NaMo-Version 1 is revived and used as a basis for the extension. This is permissible, since a more in-depth analysis of the underlying particle-dislocation interactions confirms previous expectations that the simplifying assumption of spherical precipitates is not crucial for the final outcome of the calculations, provided that the yield strength model is calibrated against experimental data. At the same time, the implementation of the Kampmann-Wagner formalism means that the different microstructure models can be linked together in a manner that enforces solute partitioning and competition between the different hardening phases which form during aging (e.g., clusters, b¢¢ and b¢). In a calibrated form, NaMo-Version 2 exhibits a high degree of predictive power, as documented by comparison with experiments, using both dedicated nanostructure and yield strength data as a basis for the validation. Hence, the model is deemed to be well-suited for simulation of thermomechanical processing of Al-Mg-Si alloys involving cold-working operations like sheet forming and stretch bending in combination with heat treatment and welding.

show abstract

CALPHAD modeling of metastable phases in the Al–Mg–Si system

Cited by 54 publications

References 73 publications

Modeling over-ageing in Al-Mg-Si alloys by a multi-phase CALPHAD-coupled Kampmann-Wagner Numerical model

Modeling over-ageing in Al-Mg-Si alloys by a multi-phase CALPHAD-coupled Kampmann-Wagner Numerical model

Precipitation and Dissolution Kinetics in Metallic Alloys with Focus on Aluminium Alloys by Calorimetry in a Wide Scanning Rate Range

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

Contact Info

Product

Resources

About