Grain refining potency of Al–B master alloy on pure aluminum

Al–B master alloys were ascertained to be efficient grain refiners on pure aluminum. Without introducing any stirring during reaction, three experimental Al–3B master alloys were prepared via the halide salt route by varying the salt addition temperature, i.e. 750, 850 and 950 °C. All of them showed grain refining potency on pure aluminum and that with the 950 °C addition temperature was found to be the most efficient. Resistance to fading was also noted during holding after inoculation with this master alloy.

► The nucleation potency of AlB2 on pure aluminum is proved.
► Al–B can refine pure aluminum at concentrations below Al–B eutectic.
► Al–B master alloys with AlB12 phase can be fading-resistant.