Melting of secondary-phase particles in Al-Mg-Si alloys

Reiso, Oddvin; Ryum, N.; Strid, Jan

doi:10.1007/bf02666268

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…Most of the heat treatments recommended for Al-Si-Cu alloys restrict the solution temperature to below the final solidification point in order to avoid the melting of copper-containing phases. [12] This phenomenon was studied by Reiso et al [13] in Al-Cu systems. The B319.0 Al-Si-Cu-Mg alloy system may be strengthened by the precipitation of intermetallic compounds of Al 2 Cu, Mg 2 Si and Al 2 CuMg during the aging treatment.…”

Section: Introductionmentioning

confidence: 88%

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Mohamed

Samuel

et al. 2008

Metall Mater Trans A

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This article presents the results of an experimental study of the effects of tin (Sn) additions (less than 0.15 wt pct) on the microstructure and mechanical properties of B319.2 and A356.2 cast aluminum (Al) alloys. The microstructural evolution was examined by means of optical microscopy and electron probe microanalysis (EPMA) techniques. Porosity measurements were also made using image analysis. Alloy hardness, tensile and impact properties were evaluated at room temperature for both as-cast and heat-treated conditions. Experimental results show that in B319.2 alloy, Sn precipitates in the form of Sn particles (b-Sn) within the Al 2 Cu network, and as minuscule (300 to 500 nm) Mg 2 Sn particles on the eutectic Si particles. However, in A356.2 alloy, Sn precipitates mainly as Mg 2 Sn in the form of Chinese script. Both the ductility and the toughness of as-cast B319.2 and A356.2 alloys are sensitive to variations in Sn content, while the yield strength (YS) remains practically unaffected. The higher ductility and toughness of Sn-containing alloys in the as-cast condition may be attributed mainly to the stress-strain state in the matrix material associated with the fineness of Sn-bearing phases.

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Section: Introductionmentioning

confidence: 88%

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Mohamed

Samuel

et al. 2008

Metall Mater Trans A

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“…This gives a ''vector-valued'' Stefan problem, where the concentration fluxes of consecutive alloying elements are such that all the alloying elements are conserved. This is explained in more detail by Reiso et al, 18) Hubert, 19) Vitek et al 20) and Vermolen et al 21,22) The ideas from the model of Vermolen,22) are used to obtain the boundary conditions of the alloying elements at the interfaces.…”

Section: Introductionmentioning

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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“…This is due to the segregation of alloying elements. [ 27 ] However, the number of melted pools decreases when the alloy is kept for longer times at this temperature; the melt pool size is increased due to the different solubility of Cu atoms. [ 28 ] However, based on the micrographs, which show the small amount of remained intermetallics, it can be concluded that, rather than being melted, a great amount of θ phase is dissolved in the matrix.…”

Section: Resultsmentioning

confidence: 99%

Dissolution of Al₂Cu Precipitate in Al2024 Additively Manufactured by Electron Beam Melting

Kenevisi

Feng

2021

Adv Eng Mater

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Samples built by the additive manufacturing experience various thermal cycles during the process. This, as a result, defines the final microstructure of the samples. Herein, the dissolution of θ‐Al2Cu precipitate along the building direction during electron beam melting process is aimed at. Induced thermal cycles cause the layers to experience critical temperatures. The results show that the average fraction area of precipitates is decreased from 3.34% to 2.63% and finally to 2.02% by moving along the building direction from the top to the bottom. This is due to the fact that the first deposited layers are kept at temperatures more than 520 °C for longer times, which is higher than the critical temperature of Al2Cu dissolution. Because of the solubility limit of Cu in the matrix, precipitates are not fully dissolved. Comparing the ratio of the integration area of the strongest θ diffraction peak to that of the α matrix at different locations, the dissolution is also confirmed by X‐ray diffraction (XRD) results. The results of the tensile test also demonstrate a decline of about 29% in the mechanical performance by moving from the top to the bottom, which can be attributed to the precipitates’ dissolution and grain coarsening.

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Melting of secondary-phase particles in Al-Mg-Si alloys

Cited by 6 publications

References 4 publications

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

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

Dissolution of Al₂Cu Precipitate in Al2024 Additively Manufactured by Electron Beam Melting

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Melting of secondary-phase particles in Al-Mg-Si alloys

Cited by 6 publications

References 4 publications

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

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

Dissolution of Al2Cu Precipitate in Al2024 Additively Manufactured by Electron Beam Melting

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

Dissolution of Al₂Cu Precipitate in Al2024 Additively Manufactured by Electron Beam Melting