Secondary dendritic arm spacing and cooling rate relationship for an ASTM F75 alloy

Ramírez-Vidaurri, L. E.; Castro‐Román, M.; Herrera-Trejo, M.; Fraga-Chavez, Karla-Leticia

doi:10.1016/j.jmrt.2022.06.146

Cited by 9 publications

(4 citation statements)

References 52 publications

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“…The critical parameter controlling the temperature and duration of this homogenization treatment is the size of eutectic cells or dendrite secondary arm spacing L [24,34]. Generally, they are related to the cooling rate vc or a local solidification time ts by a power function [35,36]:…”

Section: Discussionmentioning

confidence: 99%

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied by In-Situ Electron Microscopy

Králík,

Bajtošová,

Kihoulou

et al. 2024

Preprint

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A homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type of aluminum alloy is susceptible to the depletion of surface layers from Li. Therefore, choosing a suitable homogenization temperature and duration is a crucial step in assuring a homogeneous distribution of alloying elements and optimal exploitation of the potential of the alloy. In-situ heating in an electron microscope was performed on a twin-roll cast Al-Cu-Li-Mg-Sc-Zr alloy to understand the peculiarities of the homogenization process. Four types of primary phase particles rich in Cu, Li, Mg, and Fe were identified in the as-cast material. They appear as coarse particles at the boundaries of eutectic cells. Their partial dissolution occurs at temperatures above 450 °C. They are almost fully dissolved at 550 °C, except for complex phases containing Fe and Cu. Small dimensions of eutectic cells in the range of 10 µm assure a homogeneous distribution of main alloying elements within the matrix after 20 min of annealing. Direct comparison with the same material prepared by mold-casting indicates that such short annealing times result in the dissolution of main primary phase particles but do not assure a homogeneous distribution of alloying elements in the whole volume of the specimen.

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Section: Discussionmentioning

confidence: 99%

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied by In-Situ Electron Microscopy

Králík,

Bajtošová,

Kihoulou

et al. 2024

Preprint

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show abstract

“…The critical parameter controlling the temperature and duration of this homogenization treatment is the size of the eutectic cells or dendrite secondary arm spacing L [27,37]. Generally, they are related to the cooling rate v c or a local solidification time t s by a power function [38,39]:…”

Section: Discussionmentioning

confidence: 99%

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy

Králík,

Bajtošová,

Kihoulou

et al. 2024

Crystals

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A homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type of aluminum alloy is susceptible to the depletion of surface layers from Li. Therefore, choosing a suitable homogenization temperature and duration is a crucial step in assuring a homogeneous distribution of alloying elements and optimal exploitation of the potential of the alloy. In situ heating in an electron microscope was performed on a twin-roll-cast Al-Cu-Li-Mg-Sc-Zr alloy to understand the peculiarities of the homogenization process. Four types of primary phase particles rich in Cu, Li, Mg, and Fe were identified in the as-cast material. They appear as coarse particles at the boundaries of eutectic cells. Their partial dissolution occurs at temperatures above 450 °C. They are almost fully dissolved at 550 °C, except for complex phases containing Fe and Cu. Small dimensions of eutectic cells in the range of 10 µm assure a homogeneous distribution of the main alloying elements within the matrix after 20 min of annealing at 530 °C. Direct comparison with the same material prepared by mold casting indicates that such short annealing times result in the dissolution of the main primary phase particles but do not assure a homogeneous distribution of the alloying elements in the whole volume of the specimen.

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“…The authors observed that the secondary dendrite arm spacing decreased as the cooling rate increased. Ramirez-Vidaurri et al [11] have studied the solidification evolution of an ASTM F75, [12] alloy during directional solidification. Indeed, their work was devoted to obtain SDAS-time and SDAS-cooling rate relationships.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Secondary Arms Spacing Based on Dendrite Tip Kinetics and Cooling Rate

Sari,

Ahmadein,

Ataya

et al. 2024

Materials

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Secondary dendrite arm spacing (SDAS) is one of the most important factors affecting macrosegregation and mechanical properties in solidification processes. Predicting SDAS is one of the major parameters in foundry technology. In order to predict the evolution of microstructures during the solidification process, we proposed a simple model which predicted the secondary dendrite arm spacing based solely on the tip velocity (related to the tip supersaturation) and cooling rate. The model consisted of a growing cylinder inside a liquid cylindrical envelope. Two important hypotheses were made: (1) Initially the cylinder radius was assumed to equal the dendrite tip radius and (2) the cylindrical envelope had a fixed radius in the order of the dendrite tip diffusion length. The numerical model was tested against experiments using various Pb–Sn alloys for a fixed temperature gradient. The results were found to be in excellent agreement with experimental measurements in terms of SDAS and dendrite tip velocity prediction. This simple model is naturally destined to be implemented as a sub-grid model in volume-averaging models to predict the local microstructure, which in turn directly controls the mushy zone permeability and macrosegregation phenomena.

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Secondary dendritic arm spacing and cooling rate relationship for an ASTM F75 alloy

Cited by 9 publications

References 52 publications

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied by In-Situ Electron Microscopy

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied by In-Situ Electron Microscopy

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy

Prediction of the Secondary Arms Spacing Based on Dendrite Tip Kinetics and Cooling Rate

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