Dissolution Rates of Various Manganese Alloying Elements in Aluminium

Alloying is usually a necessary operationOperation before castingCasting, and alloying elements with higher meltingMelting point than the melt temperature that typically gives slow dissolutionDissolution rates. Higher aluminiumAluminium content in Al-Mn master alloysMaster alloy corresponds to higher dissolutionDissolution rates. Oxide layers towards the Mn alloyAlloys reduce the dissolutionDissolution rate. Penetration of liquid Al into the Mn alloyAlloys structure increases the dissolutionDissolution rate unless a solid alloyAlloys is formed. In this study, approximately 0.5 kg pure aluminiumAluminium was melted in a 16 kW induction ladle. Laser-Induced Breakdown SpectroscopyLaser-induced breakdown spectroscopy (LIBSLIBS) was used to determine the chemistry continuously in the melt as various alloying compositions from 20 to 100% Mn were introduced. The melt temperature was maintained isothermal at temperatures 720, 770, and 800 °C. From the results the dissolutionDissolution rate for the various Mn alloyingMn alloying elements, in this set-up, is calculated. The results are useful for upscaling precise alloying practises in cast houses.