Abstract
The influences of potassium fluozirconate (K 2ZrF 6) salts mixture (KSM) on the grain refinement, microstructure, mechanical properties and corrosion resistance of Mg–10Gd–3Y (GW103, wt.%) magnesium alloy were investigated. The results show that an addition of 8 wt.% KSM-2 (50 wt.% K 2ZrF 6–25 wt.% NaCl–25 wt.% KCl) provides the best combination of fine grain size and the lowest fraction of inclusions for GW103 alloy. The mechanical properties and corrosion resistance of GW103 alloy are improved by KSM-2 addition. The formation of Zr from the in situ reaction between Mg melt and K 2ZrF 6 is responsible for the refining mechanism of KSM. Compared with the Mg–30 wt.% Zr master alloy, the KSM refiner shows much longer fading time during smelting.
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