MTDATA software was used in order to gain an insight into the effects of alloying addition on the stability of the various phases that are in equilibrium in the materials under study. This was achieved by performing complex equilibria calculations to produce isoplethal sections of temperature against alloy concentration. Thermodynamic data were retrieved from databases appropriate to the experimental alloys compositions. After retrieval of the data, a range of temperature and composition was chosen for each calculation. By performing global Gibbs energy minimisation calculations, the stable phases in the temperature and composition were determined and plotted as isoplethal sections. It can be seen the aluminium content modifies the iron-carbon equilibrium at this alloy composition. The austenite region decrease with increasing Al content, and for cast iron containing about 4.88%Al or more, there is no evidence of austenite zone. However, there was a difference with observation for the 4.88%Al.

Keywords: Phase diagrams, MTDATA software, Austenite, Phase transformation

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1. Phase Transformation Study of Aluminium Containing Ductile irons by Dilatometry