The effect of the cooling rate or the local solidification time and composition on the secondary dendrite arm spacing during solidification PART II: Al—Mg—Si alloys

Rontó, Viktória; Roósz, András

doi:10.1080/13640461.2001.11819431

Cited by 15 publications

(13 citation statements)

References 10 publications

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“…A different approach, taken by some researchers, [39,40] is to apply mathematical modeling using experimental datasets to determine empirical relationships between the composition and the SDAS. This approach has the advantage of potentially giving more accurate predictions for the alloys used, but has the disadvantage of offering no basis of prediction for alloys with untested elements or element combinations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alloy Composition on the Dendrite Arm Spacing of Multicomponent Aluminum Alloys

Easton

Davidson

John

2010

Metall Mater Trans A

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Predictions of secondary dendrite arm spacing (SDAS) for multicomponent aluminum alloys using a dendrite ripening model are compared with experimental observations. For six of the seven alloys studied, the predicted SDAS was within 20 pct of the measured SDAS. It was found that the final SDAS was dependent upon both the solidification time and the solute profile of the solidifying alloys. It is interesting that while the solidification times and the solute segregation during solidification varied significantly over the range of alloys, these two factors largely canceled each other out so that the predicted SDAS did not vary much between the alloys. The experimental and modeling results show that elements causing high constitutional undercooling near the beginning of solidification, e.g., Ti, which reduces the grain size substantially, have little effect on the SDAS. Instead, it was found that elements that strongly partitioned toward the end of solidification were more effective at restricting SDAS coarsening.

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Section: Introductionmentioning

confidence: 99%

Effect of Alloy Composition on the Dendrite Arm Spacing of Multicomponent Aluminum Alloys

Easton

Davidson

John

2010

Metall Mater Trans A

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“…(i) Taking into consideration the decrease in the liquidus temperature calculated from the initial concentration distribution, the SDAS was calculated with a well-known equation as a function of the position using the average velocity (v av ) and temperature gradient (G av ) [29,30]:…”

Section: Discussionmentioning

confidence: 99%

Influence of Solidification Parameters on the Amount of Eutectic and Secondary Arm Spacing of Al–7wt% Si Alloy Solidified under Microgravity

Roósz

Rónaföldi

et al. 2022

Crystals

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During the solidification of hypoeutectic Al–7% Si alloy, density differences develop in the melt due to variations in concentration and temperature. On Earth, melt flow can occur due to gravity, which then affects the solidification process. The microgravity environment strongly eliminates convection in the melt and allows investigation of the solidification process in purely diffusive circumstances. In this study, four solidification experiments were performed on grain-refined and non-grain-refined Al–7 wt% Si alloy on-board the International Space Station (ISS) in the Materials Science Lab (MSL) to study the effect of solidification parameters (solid/liquid front velocity (v) and temperature gradient (G)) on the grain structure and dendritic microstructure. The grain structure has been analyzed in detail in some earlier studies. The aim of this work was to carry out detailed analysis of the macrosegregation caused by the diffusion of Si from the initial mushy zone during the homogenization step and the subsequent solidification phase of the experiments as well as the correlated distribution of eutectic along the solidification direction. The secondary dendrite arm spacing (SDAS) for different process conditions was also studied. For these two issues, microgravity experimental results were compared to simulation results. The macrosegregation was calculated by the finite difference method. Because the steady-state solidification conditions were never reached, the solidification process was characterized by the average front velocity and temperature gradient. Considering the actual liquidus temperature (TL) caused by macrosegregation, the SDAS was calculated as a function of the average processing parameters and the actual liquidus temperature with the classical Kirkwood’s equation. As a result, good agreement was obtained between the calculated and measured SDAS.

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“…The evaluation was carried out in line with methodology described in papers [13][14][15]. 100 cells were taken into account each case the determination of the parameter was carried out.…”

Section: Research Materials and Methodologymentioning

confidence: 99%

Usable Properties of AlSi7Mg Alloy after Sodium or Strontium Modification

Tupaj¹,

Orłowicz²,

Mróz³

et al. 2016

Archives of Foundry Engineering

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The paper deals with the effect of microstructure diversified by means of variable cooling rate on service properties of AlSi7Mg cast alloy refined traditionally with Dursalit EG 281, grain refining with titanium-boron and modified with sodium and a variant of the same alloy barbotage-refined with argon and simultaneously grain refining with titanium-boron and modified with strontium. For both alloy variants, the castings were subject to T6 thermal treatment (solution heat treatment and artificial aging). It turned out that AlSi7Mg alloy after simultaneous barbotage refining with argon and grain refining with titanium-boron and modified with strontium was characterised with lower values of representative microstructure parameters (SDAS -secondary dendrite arm spacing, λ E , l max ) and lower value of the porosity ratio compared to the alloy refined traditionally with Dursalit EG 281 and grain refining with titanium-boron and modified with sodium. The higher values of mechanical properties and fatigue strength parameters were obtained for the alloy simultaneously barbotagerefined with argon and grain refining with titanium-boron and modified with strontium.

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The effect of the cooling rate or the local solidification time and composition on the secondary dendrite arm spacing during solidification PART II: Al—Mg—Si alloys

Cited by 15 publications

References 10 publications

Effect of Alloy Composition on the Dendrite Arm Spacing of Multicomponent Aluminum Alloys

Effect of Alloy Composition on the Dendrite Arm Spacing of Multicomponent Aluminum Alloys

Influence of Solidification Parameters on the Amount of Eutectic and Secondary Arm Spacing of Al–7wt% Si Alloy Solidified under Microgravity

Usable Properties of AlSi7Mg Alloy after Sodium or Strontium Modification

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