Dendritic and seaweed growth of proeutectic scandium tri-aluminide in hypereutectic Al-Sc undercooled melt

Jiang, Aoke; Wang, Xiaoming

doi:10.1016/j.actamat.2020.08.078

Cited by 22 publications

(2 citation statements)

References 47 publications

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“…Despite the random appearance of its growth, degenerate seaweed exhibits a quasiperiodic behavior of tip splitting, which is different from dendrites and stable seaweed. Researchers found that the tip splitting of degenerate seaweed should have its basis in the Mullins–Sekerka (M–S) instability for a plane solid–liquid interface …”

Section: Introductionmentioning

confidence: 99%

“…Researchers found that the tip splitting of degenerate seaweed should have its basis in the Mullins−Sekerka (M−S) instability for a plane solid−liquid interface. 14 Moreover, the degenerate seaweed pattern has been considered to be a bridge between the ordered orientation of dendrites and the disordered orientation of seaweed. Dendriteto-degenerate seaweed and degenerate seaweed-to-stable seaweed transitions can be observed to occur as the surface tension anisotropy decreases.…”

Section: Introductionmentioning

confidence: 99%

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Tip Splitting Dynamics in Degenerate Seaweed Patterns of Aluminum Alloys Induced by Anisotropic Surface Tension

Wang

Shi

et al. 2023

Crystal Growth & Design

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The formation of degenerate seaweed in Al-4.5 wt % Cu, Al-3 wt % Mg, and commercial A356 alloys during quasitwo-dimensional directional solidification is studied. By designing (100)[011]-and (−211)[111]-oriented planar-front seeds, the surface tension profiles are symmetrically arranged with respect to the temperature gradient direction. The results show that growth toward the surface tension maxima is preferred, and the tips tend to grow outward in both directions, leading to degenerate seaweed formation. The comparison of the degenerate seaweeds in the three Al alloys shows that the morphologic features are qualitatively similar. However, the anisotropic surface tension has a significant effect on the growth dynamics of the degenerate seaweed. This quantitatively indicates that Al alloys with a larger anisotropy tend to exhibit growth with a smaller tip spacing (λ) and a higher splitting frequency (f).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%