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The effect of dilute solute additions on growth restriction in binary Cu alloys has been assessed at different degrees of superheat. Columnar grain length values from Northcott’s work (Northcott in J Inst Metals 62:101-136, 1938) for binary Cu alloys were plotted against the corresponding undercooling parameter (P), the reciprocal of the  conventional  (Q  conv.  ) and  true  (Q  true  ) growth restriction factor (Schmid-Fetzer and Kozlov in Acta Mater 59(15):6133-6144, 2011) values. It was found that there was no correlation between the columnar grain length values and P, 1/Q  conv.   and 1/Q  true   values for different solutes and cast at the same degree of superheat. Unlike P, Q  conv.  , and Q  true   values, the heuristic growth restriction parameter ( β ) (Fan et al. in Acta Mater 152, 248-257, 2018) modeling framework in conjunction with the critical solute content ( C *) for growth restriction fitted well to binary Cu alloys.

On the Role of Dilute Solute Additions on Growth Restriction in Binary Copper Alloys