Abstract
Steady-state directional solidification studies are described for Sr- and Sb-treated commercial purity Al-7 Si-0.5 Mg (LM25) casting alloys. The minor additions refine the secondary dendrite arm spacing which can be described by the equations: for Sr treated alloys and for Sb treated alloyswhere tf is the total solidification time.Specimens quenched during solidification are used to follow the coarsening of secondary dendrite arms during solidification. It is shown that coarsening behaviour can be described by an average coarsening parameter, , in the equation If the geometrical constant B is assumed to be 33, the value of calculated from spacing measurements is 20.80 and 15.22 (μm s−1) for Sr- and Sb-treated alloys, respectively. Both additions reduce the rate of coarsening. The influence of the additions on the growth temperatures of the primary Al phase and the eutectic phase is discussed.
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