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In the present study, the Henrian activity coefficient of strontium, dissolved in liquid Al-7Si alloy at 725–730°C has been determined to be in the order of 10 −2 , using the numerical thermodynamic analyses. By knowing the, formation of the compounds, Sr(OH) 2  and SrH 2  through the reaction of dissolved elements in Al-7Si alloy melt has been analysed. The results indicated that the free energy of the formation reaction of Sr(OH) 2  and SrH 2  in the alloy melt are positive at different temperatures, showing that these compounds may not be formed in the liquid aluminium alloys.

Activity of strontium in liquid Sr-modified Al-7Si alloy