The dependence of the β-AlFeSi to α-Al(FeMn)Si transformation kinetics in Al–Mg–Si alloys on the alloying elements

Kuijpers, N.C.W.; Vermolen, F.J.; Vuik, C.; Koenis, P.T.G.; Nilsen, K.E.; Zwaag, Sybrand van der

doi:10.1016/j.msea.2004.09.073

Cited by 168 publications

(88 citation statements)

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“…Insoluble or undissolved intermetallic particles and dispersoids, such as ß-Al 5 FeSi, α-Al 15 (FeMn) 3 Si and α-Al 12 (Fe,Mn) 3 Si, which form during solidification or homogenisation, can be present in Al-Mg-Si type alloys with Mn and Fe additions and impurities [67,79,80,81,82,83,84]. The SEM micrograph in Fig.…”

Section: Acknowledgementsmentioning

confidence: 99%

“…Since the presence of these phases will remove some Si from the solid solution, it is necessary to calculate the effective solute concentration in the matrix after solution heat treatment. The solubility of Mn and Fe during solution treatment has been studied and predictions using thermodynamic modelling are available [79]. We will here use these predictions to estimate the amount of Si in solution.…”

Section: Acknowledgementsmentioning

confidence: 99%

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A model for the thermodynamics of and strengthening due to co-clusters in Al–Mg–Si-based alloys

2012

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An expanded model for the thermodynamics of co-clusters and their strengthening is presented, and the model is applied to predict co-cluster formation and strengthening in AlMg-Si alloys. The models are tested against data on a wide range of Al-Mg-Si alloys aged at room temperature. The strengthening due to co-clusters is predicted well. The formation of the co-clusters is studied in an Al-0.5at%Mg-1at%Si alloy using three-dimensional atom probe analysis. The results correspond well with the model. It is shown that in general, (shortrange) order strengthening due to co-clusters will be the main strengthening mechanism in these alloys. Apart from the co-clusters, Si clusters also form, but due to their low enthalpy of formation, they contribute little to the strength.

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Section: Acknowledgementsmentioning

confidence: 99%

Section: Acknowledgementsmentioning

confidence: 99%

A model for the thermodynamics of and strengthening due to co-clusters in Al–Mg–Si-based alloys

2012

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“…In this case it is necessary to take the iron solubility on the particle into account. The effect of Mn on the transformation rate will be described by Kuijpers et al 25) To compute the interface concentration for the -plate, the solubility product is determined from Thermo-Calc for several temperatures and expressed in an Arrhenius-relation:…”

Section: Solubility Relations Of Fe On the And The Particlesmentioning

confidence: 99%

“…An increase of e.g. 25 C of the temperature can increase the transformed state considerably. This rapid increase is caused by two effects: both the solubility at the rim, and the diffusion coefficient increases with increasing temperature.…”

Section: Variation Of Temperaturementioning

confidence: 99%

A Model of the β-AlFeSi to α-Al(FeMn)Si Transformation in Al-Mg-Si Alloys

Kuijpers¹,

Vermolen

Vuik

et al. 2003

Mater. Trans.

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During the homogenisation process of Al-Mg-Si extrusion alloys, plate-like -Al 5 FeSi particles transform to multiple roundedAl 12 (FeMn) 3 Si particles. The rate of this to transformation determines the time which is required to homogenise the aluminium sufficiently for extrusion. In this paper, a finite element approach is presented which model the development of fraction transformed with time, in the beginning of the transformation, as a function of homogenisation temperature, as-cast microstructure and concentration of alloying elements. We treat the to transformation mathematically as a Stefan problem, where the concentration and the position of the moving boundaries of the and particles are determined. For the boundary conditions of the model thermodynamic calculations are used (Thermo-Calc). The influence of several process parameters on the modelled transformed fraction, such as the temperature and initial thickness of the plates, are investigated. Finally the model is validated with experimental data.

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“…These alloys always contain Iron impurities, which are detrimental to their mechanical properties and extrusion characteristics. This is attributed to the formation of different Iron-containing intermetallic phases [1][2][3][4] . Around 17 different intermetallic phases, with general composition of either aluminium-iron or Al-Fe-Si, have been summarized [5] .…”

Section: Introductionmentioning

confidence: 99%

Effect of iron addition on the crystal structure of the α-AlFeMnSi phase formed in the quaternary Al-Fe-Mn-Si system

Orozco-González¹,

Castro‐Román²,

López-Cuevas³

et al. 2011

REVMETAL

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Cubic and hexagonal a-phases, formed during thermal analysis experiments and specific isothermal treatments, have been analyzed for a series of Al-Mn-Si alloys with different iron contents. In these alloys, the Fe/Mn weight ratio was varied from 0.1 to 8.4. This study shows that in Al-Fe-Mn-Si alloys with Fe/Mn weight ratios up to 4, the a-phase has a cubic crystal structure, while in alloys with a Fe/Mn weight ratio of 5.3 or more, the a-phase has a hexagonal crystal structure. Hence, the critical Fe/Mn weight ratio for the cubic to hexagonal crystal structure transition falls between 4 and 5.3 for the studied alloys. KeywordsAluminum alloys; Intermetallic Al-Fe-Mn-Si phases; X-ray analysis diffraction; Crystal structure type.Efecto de la adición de hierro sobre la estructura cristalina de la fase a-AlFeMnSi formada en el sistema cuaternario Al-Fe-Mn-Si ResumenLas fases a de estructura cristalina cúbica y hexagonal, formadas durante los ensayos de análisis térmico y tratamientos isotérmicos específicos, han sido analizadas para una serie de aleaciones Al-Mn-Si con diferente contenido de hierro. En estas aleaciones, la relación en peso Fe/Mn se varió de 0,1 a 8,4. Este estudio muestra que las aleaciones Al-13,4Si-1,1 Mn-Fe con relación en peso Fe/Mn menor o igual a 4, la fase a presenta estructura cristalina cúbica, mientras que en aleaciones con una relación Fe/Mn igual o mayor a 5,3, la fase a presenta estructura cristalina hexagonal. Por lo tanto, la relación crítica Fe/Mn para la transición de estructura cristalina de cúbica a hexagonal se encuentra entre 4 y 5,3 para las aleaciones estudiadas. Palabras claveAleaciones de aluminio; Compuestos intermetálicos Al-Fe-Mn-Si; Difracción de rayos X; Tipo de estructura cristalina.P. OROZCO-gONZálEZ, M. CASTRO-ROMáN, J. lóPEZ-CUEVAS, A. HERNáNDEZ-RODRígUEZ, R. MUñIZ-VAlDEZ, S. lUNA-álVAREZ AND C. ORTIZ-CUEllAR 454 Rev. metal. 47 (6), NOVIEMBRE-DICIEMBRE, 453-461, 2011, ISSN: 0034-8570, eISSN: 1988-4222, doi: 10.3989/revmetalm.1068 1.2, the presence of cubic a and a bcc -AlFeMnSi phases, the latter described as Al 19 Fe 4 MnSi 2 , has been reported [5] . The formation of a hexagonal a h -AlFeMnSi phase, with a formula of Al 8 Fe 2 Si, has also been reported [6, 10 and 11] . Tibballs et al. [12] studied a set of eight alloys of the Al-(6-8)Si-(0.4-3.5)Fe-(0.1-3.6)Mn system. They reported the precipitation of a cubic a c -AlFeMnSi phase in alloys with a Fe/Mn weight ratio up to 8.3, whereas the a h -AlFeMnSi was the stable phase in alloys with a Fe/Mn ratio equal or higher than 12.5.From the point of view of the improvement of the available thermodynamic databases, the study of Al-Fe-Mn-Si system and other alloy systems is gaining importance in basic and applied research. Ravi and Wolverton [13] made a critical comparison of the two commercially available Al-alloy thermodynamic databases: Thermotech and Computherm. They observed some differences in the databases with regard to the intermetallic compounds involving iron, manganese, chromium, and zinc. Thus, they...

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The dependence of the β-AlFeSi to α-Al(FeMn)Si transformation kinetics in Al–Mg–Si alloys on the alloying elements

Cited by 168 publications

References 10 publications

A model for the thermodynamics of and strengthening due to co-clusters in Al–Mg–Si-based alloys

A model for the thermodynamics of and strengthening due to co-clusters in Al–Mg–Si-based alloys

A Model of the β-AlFeSi to α-Al(FeMn)Si Transformation in Al-Mg-Si Alloys

Effect of iron addition on the crystal structure of the α-AlFeMnSi phase formed in the quaternary Al-Fe-Mn-Si system

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The dependence of the β-AlFeSi to α-Al(FeMn)Si transformation kinetics in Al–Mg–Si alloys on the alloying elements

Cited by 168 publications

References 10 publications

A model for the thermodynamics of and strengthening due to co-clusters in Al–Mg–Si-based alloys

A model for the thermodynamics of and strengthening due to co-clusters in Al–Mg–Si-based alloys

A Model of the &beta;-AlFeSi to &alpha;-Al(FeMn)Si Transformation in Al-Mg-Si Alloys

Effect of iron addition on the crystal structure of the α-AlFeMnSi phase formed in the quaternary Al-Fe-Mn-Si system

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A Model of the β-AlFeSi to α-Al(FeMn)Si Transformation in Al-Mg-Si Alloys