TESTING PHASE CHANGES IN Al-Si ALLOYS WITH APPLICATION OF THERMAL ANALYSIS AND DIFFERENTIAL CALORIMETRIC ANALYSIS

J. Piątkowski, B. Gajdzik, The Silesian University of Technology, Faculty of Materials Science and Metallurgy, Katowice, Poland The paper presents enthalpy of melting and solidifi cation of casting aluminium alloys AlSi6, AlSi12 and AlSi18 during heating and cooling. Calorimetric measurements preceded by tests of thermal analysis ATD were conducted on high-temperature scanning calorimeter multi HTC. A direct method was used for determining parameters of hightemperature processes and enthalpies occurring in phase changes. This method allowed for precise determining of endothermic and exothermic phase changes and, on their basis, the characteristic parameters of solidifi cation necessary to assess the thermal endurance were marked.