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The dendritic tip stability parameter σ ∗ is estimated for two aluminium alloys, namely Al–4wt.%Cu and Al–2wt.%Si, based on recently measured values of their crystal-melt surface energy anisotropy strength and linear scaling of the microscopic solvability theory. The influence of the stability parameter on columnar dendritic growth models of solidification, and consequently on columnar to...
It is shown that thermal effects dominate the interaction between neighbouring growing dendritic crystals in alloy solidification, for the majority of the growth stage between nucleation and impingement in typical castings. It is only near final impingement between growing grains that their solutal boundary layers overlap. Relevant predictions of a meso-scale front tracking computational model are...
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