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The work presents the test results of the crystallisation and cooling of magnesium alloys: AM60 and AZ91, with the use of the TDA method. The tested alloys were cast into ceramic shells heated up to 180 C, produced according to the technology of the shell production in the investment casting method. The TDA method was applied to record and characterize the thermal eect resulting from the phase transformations occurring during the crystallisation of magnesium alloys. The kinetics and dynamics of the thermal processes of the crystallisation of AM60 and AZ91 in the ceramic shells were determined. Metallographic tests were performed with the use of an optical microscope as well as scanning microscopy, together with the EDS chemical analysis of the phases present in the tested casts. A comparison of these test results with the thermal eect recorded by way of the

archives of metallurgy and materials

Analysis of Am60 and Az91 Alloy Crystallisation in Ceramic Moulds by Thermal Derivative Analysis (Tda)/ Analiza Krystalizacji Stopów Am60 I Az91 W Formie Ceramicznej Metodą Analizy Termiczno-Derywacyjnej (Atd)