The effect of heat treatment on Mg2Si coarsening in aluminum 6105 alloy

Usta, Metin; Glicksman, M.E.; Wright, Roger N.

doi:10.1007/s11661-004-0354-7

Cited by 54 publications

(24 citation statements)

References 9 publications

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“…[40,41] Because of the dissolution and degradation of grain boundary secondary phases, mainly Fe-IMCs, IMC inter-connectivity was also notably reduced after homogenization (Figure 8(c)), with inter-connectivity only maintained by those particles that retained the larger petals around primary a-Al grains, as shown in Figure 15(b). Similarly the platelet-like inter-connected b-AlFeSi breaks into fine disk-like particles during the b-AlFeSi to a c -AlFeSi transformation leaving finer disk-like particles around grains, as also shown in Figure 15(b).…”

Section: B Evolution Of Fe-imcs During Homogenizationmentioning

confidence: 99%

Evolution of Fe Bearing Intermetallics During DC Casting and Homogenization of an Al-Mg-Si Al Alloy

Kumar

Grant

O’Reilly

2016

Metall Mater Trans A

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The evolution of iron (Fe) bearing intermetallics (Fe-IMCs) during direct chill casting and homogenization of a grain-refined 6063 aluminum-magnesium-silicon (Al-Mg-Si) alloy has been studied. The as-cast and homogenized microstructure contained Fe-IMCs at the grain boundaries and within Al grains. The primary a-Al grain size, a-Al dendritic arm spacing, IMC particle size, and IMC three-dimensional (3D) inter-connectivity increased from the edge to the center of the as-cast billet; both a c -AlFeSi and b-AlFeSi Fe-IMCs were identified, and overall a c -AlFeSi was predominant. For the first time in industrial billets, the different Fe-rich IMCs have been characterized into types based on their 3D chemistry and morphology. Additionally, the role of b-AlFeSi in nucleating Mg 2 Si particles has been identified. After homogenization, a c -AlFeSi predominated across the entire billet cross section, with marked changes in the 3D morphology and strong reductions in inter-connectivity, both supporting a recovery in alloy ductility.

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Section: B Evolution Of Fe-imcs During Homogenizationmentioning

confidence: 99%

Evolution of Fe Bearing Intermetallics During DC Casting and Homogenization of an Al-Mg-Si Al Alloy

Kumar

Grant

O’Reilly

2016

Metall Mater Trans A

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“…The authors conclude, on the basis of regression analysis, that the results show a particularly strong correlation with n ϭ 3.8 in [1] where t is time at temperature and is the value of at t ϭ 0, suggesting that grain boundary diffusion (n ϭ 4) dominates volume diffusion (n ϭ 3) in the coarsening of these particles. The present purpose is to offer an alternative interpretation of these results.…”

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confidence: 94%

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Discussion of “the effect of heat treatment on Mg2Si coarsening in aluminum 6105 alloy”

Jones

2005

Metall Mater Trans A

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This interesting article [1] includes measurements of the size distribution, average radius , and volume fraction f of globular Mg 2 Si particles in this Al-Mg-Si alloy vs duration of homogenization treatment for up to 7 days at 590 °C. The authors conclude, on the basis of regression analysis, that the results show a particularly strong correlation with n ϭ 3.8 in [1] where t is time at temperature and is the value of at t ϭ 0, suggesting that grain boundary diffusion (n ϭ 4) dominates volume diffusion (n ϭ 3) in the coarsening of these particles. The present purpose is to offer an alternative interpretation of these results.The experimental data at issue are presented in Table I, together with resulting values of and for each value of t, taking at t ϭ 0. These results give mean K values of 3.6 Ϯ 0.4 ϫ 10 Ϫ20 m 3 /s for volume diffusion and 8.3 Ϯ 0.7 ϫ 10 Ϫ25 m 4 /s for grain boundary diffusion control. Table II presents corresponding values of K predicted from the LSW [2,3] and Kirchner [4] models, respectively:and [3] where C ∞ is solid solubility of the controlling solute; D and DЈ are its diffusivities in the matrix and along grain boundaries; w is grain boundary width; ␥ is dispersoid/matrix interfacial energy; ⍀ is the volume per mol of dispersoid containing one atom of controlling solute; R is the gas constant; T is the temperature (here 863 K); A ϭ (2/3-m ϩ m 3 /3), where m is half the ratio of grain boundary energy to particle/matrix interfacial energy; and B ϭ 0.5 ln (1/f ), where f is the average area fraction occupied by a particle on the grain boundary. Resulting values of K LSW and K GBD are, respectively, factors of 2 to 4 ϫ 10 3 and 3 ϫ 10 5 below their corresponding values obtained experimentally (Table I), indicating that neither solute diffusion through the ␣-Al crystal lattice nor along its grain boundaries can account for the observed rates of coarsening of Mg 2 Si in this alloy at 590 °C. A further possibility arises from the proximity of 590 °C to the solidus temperature (ϳ620 °C according to the phase diagram "typical"Table I. Results from Reference 1 for Mean Radius r vs Time t at 590 °C for Mg 2 Si Particles in 6105 Aluminum Alloy t (days) 0 1 2 3 4 5 6 10.0 16.6 19.8 22.2 23.6 24.1 26.3 K 1 (m 3 /s) -0.041 0.039 0.038 0.035 0.030 0.033 mean 0.036 Ϯ 0.004 m 3 /s K 2 (m 4 /s) -0.76 0.83 0.90 0.87 0.76 0.90 mean 0.83 Ϯ 0.07 m 4 /s Here, and with . r o ϭ 10 mm K 2 ϭ (r 4 Ϫ r 4 )/t K 1 ϭ (r 3 Ϫ r 3 )/t r (mm)

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“…However, previous results showed that large globular Mg 2 Si particles in billets of a 6105 alloy, which contains 0.85 wt.% Mg 2 Si, did not dissolve at 590°C which is above its solvus temperature, but instead coarsened with time from 10 mm to 26 mm after heat treatment for 7 days. 12 These results suggest that the actual solvus and solidus temperatures for the 6105 alloy may be higher than indicated in the classic phase diagram. 13 Hence, the solutionizing temperature for a specific alloy should be optimized according to the change in the size of Mg-Si particles after the solution heat treatment.…”

Section: Solutionizing and Precipitation Of Mg-si Particles In 6xxx Smentioning

confidence: 84%

Effect of process variables on Mg-Si particles and extrudability of 6xxx series aluminum extrusions

Zhu

Couper

Dahle

2011

JOM

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How would you……describe the overall significance of this paper? Process variables have significant impact on extrudability and product properties through their effects on the characteristics of Mg-Si particles in 6xxx series aluminum extrusions. This paper reviews the effects of MgSi particles on extrudability and the effects of major process parameters on the characteristics of Mg-Si particles as well as on the process and product properties of 6xxx series aluminum extrusions. This provides a framework for optimizing the manufacturing process of aluminum extrusions.…describe this work to a materials science and engineering professional with no experience in your technical specialty?The effects of process parameters on extrudability in terms of mechanical properties and surface quality of 6xxx series aluminum extrusions through their effects on the characteristics of Mg-Si particles are reviewed. The size, distribution, and morphology of the Mg-Si particles have significant impact on extrudability, and are influenced by various process parameters in the production of extrusions. This review provides a basis for process optimization for enhancing the process and product properties. …describe this work to a layperson?This paper reviews the effects of various process parameters on the characteristics of Mg-Si particles and the process and product properties of aluminum extrusions. This provides an understanding of the mechanisms behind the effects of various processing steps on the properties and of how to develop the optimum manufacturing process for extruded products.The Mg-Si particles are one of the major constituents in the microstructure of 6xxx series aluminum alloys. The size, distribution, and morphology of the Mg-Si particle have significant impact on extrudability in terms of mechanical properties and surface quality of aluminum extrusions. The characteristics of the Mg-Si particles are influenced by various process parameters in the production of extrusions. This paper reviews the effects of the major process variables on the Mg-Si particle characteristics and extrudability of aluminum extrusions.

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The effect of heat treatment on Mg2Si coarsening in aluminum 6105 alloy

Cited by 54 publications

References 9 publications

Evolution of Fe Bearing Intermetallics During DC Casting and Homogenization of an Al-Mg-Si Al Alloy

Evolution of Fe Bearing Intermetallics During DC Casting and Homogenization of an Al-Mg-Si Al Alloy

Discussion of “the effect of heat treatment on Mg2Si coarsening in aluminum 6105 alloy”

Effect of process variables on Mg-Si particles and extrudability of 6xxx series aluminum extrusions

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