Metastable Dendrite Morphologies in Aluminum Alloys

Henein, H.; Bogno, Abdoul-Aziz; Hearn, William; Valloton, J.

doi:10.1007/s11669-020-00833-1

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…Under such conditions, anisotropy of attachment kinetics was considered as a contributing factor. More recently, Henein et al [ 24 ] confirmed this important factor to explain this type of structure in rapidly solidified Al alloy droplets of various compositions, including Al‐Si.…”

Section: Resultsmentioning

confidence: 91%

Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s⁻¹

et al. 2022

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Al-Si alloys have a wide range of applications in automotive and aerospace components due to their favorable properties such as low density, high specific stiffness, resistance to high temperatures and abrasion, and low thermal expansion coefficient. [1] Alloying elements have been strategically included into the composition of Al-Si-based alloys in order to improve specific properties of interest. [2][3][4][5] For tribological applications, elements with solid lubricant ability, such as bismuth and tin are of interest to Al-Si alloys for improved bearing performance. This performance depends strongly on the alloy's microstructural features, such as the secondary dendrite arm spacing, the eutectic lamellar spacing, or the spacing between the soft and immiscible Bi particles in the aluminum matrix. [6] Efforts have been put by Costa et al. [5] and Dias et al. [7] into studies of microstructural arrangements of such alloys, particularly Al-Si-Bi, correlated with a range of solidification thermal parameters provided by a water-cooled mold. However, this range is limited to cooling rates provided by the water-cooled mold. Higher values may be reached by processes involving rapid solidification.Hearn et al. [8] reported typical hypoeutectic microstructures characterized by proeutectic α-Al dendrites surrounded by α-Al þ Si eutectic. The Al-10 wt%Si alloy was solidified by differential scanning calorimetry (DSC) with cooling rates of 0.01, 0.02, 0.08, 0.2, 0.3, and 0.8 K s À1 . The eutectic microstructure was reported to have a flaky morphology for all the conditions examined. Costa et al. [5] examined the effect of adding 1 wt%Bi to an Al-9 wt%Si alloy. They reported that the secondary and tertiary dendrite arm spacings are not affected. However, a coarsening effect on the primary arm spacing is shown to occur for the ternary alloy when compared to the binary alloy for similar cooling rates. The addition of Bi was shown not to affect the ultimate tensile strength. However, the elongation to fracture is improved. Furthermore, a higher machinability is achieved,

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Section: Resultsmentioning

confidence: 91%

Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s⁻¹

et al. 2022

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“…Examples include <110> growth in certain compositions of Al-Zn [15,16] and Al-Ge [17]. Recently, unexpected <111> growth in Al-Cu [18][19][20][21] was reported. The different growth morphologies are linked to composition-related changes in the surface-tension anisotropy distribution [15] and are likely to be influenced by the surface attachment kinetics [18].…”

Section: Introductionmentioning

confidence: 99%

Competitive growth during directional solidification experiments of 〈1 1 1〉 Dendrites

Hughes

Robinson

McFadden

2022

Journal of Crystal Growth

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X-Ray Tomographic Quantification of Diffusive Growth of Metallic Dendrite in High Magnetic Field

Lin,

Zhou,

Zheng

et al. 2023

Metall Mater Trans A

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Metastable Dendrite Morphologies in Aluminum Alloys

Cited by 6 publications

References 24 publications

Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s⁻¹

Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s⁻¹

Competitive growth during directional solidification experiments of 〈1 1 1〉 Dendrites

X-Ray Tomographic Quantification of Diffusive Growth of Metallic Dendrite in High Magnetic Field

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Metastable Dendrite Morphologies in Aluminum Alloys

Cited by 6 publications

References 24 publications

Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s−1

Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s−1

Competitive growth during directional solidification experiments of 〈1 1 1〉 Dendrites

X-Ray Tomographic Quantification of Diffusive Growth of Metallic Dendrite in High Magnetic Field

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Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s⁻¹

Microstructure and Hardness of an Al–8 wt%Si–2.5 wt%Bi Alloy Subjected to Solidification Cooling Rates from 0.1 to 800 K s⁻¹