Calorimetric Analysis of Grain Modified Mg–Li Alloy

Abstract

Nowadays calorimetric analysis is a widely used method to study phase transformations occurring in the liquid or solid state in metals and alloys. Information on enthalpy, kinetics and transition characteristics can be obtained with the appropriate configuration of analytical apparatus and establishment of test procedures. In this work, an analysis of the transitions taking place in the grain-modified dual phase α(Mg)+ β(Li) Mg–9Li–1.5Al alloy was carried out on the samples taken from casts. The latent heat of the analysed alloys was captured using the UMSA device. The solidification process has been analysed using cooling curve analysis. The latent heat at a natural cooling rate 0.5°C/s was calculated based on the first derivative of the cooling curve. The released latent heat during crystallisation was estimated by applying the Newtonian technique of baseline. The results confirmed that calorimetric analysis can be successfully applied to study phase transitions in this type of magnesium alloy. The work uses thermal derivative analysis to present the possibility of specifying the latent heat of modified ultralight Mg–Li cast alloys.