A Thermodynamic Description of the Al-Mn-Si System over the EntireComposition and Temperature Ranges

摘要

A thermodynamic modeling for the whole Al-Mn-Si system is established via two steps.In the first step, all of the experimental phase diagram and thermodynamic data availablefrom the literature are critically reviewed, and an isopleth with 5 at.%t Si and 0 to 30 at.%Mn is constructed by means of X-ray diffraction (XRD) and differential thermal analysis(DTA) techniques. In the second step, a consistent thermodynamic data set for the Al-Mn-Si system over the entire composition and temperature ranges is obtained by consideringthe reliable literature data and the present experimental results. Numerous comparisonsbetween the calculated and measured phase diagrams as well as thermodynamic quantitiesindicate that almost all of the reliable experimental information is satisfactorily accountedfor by the present thermodynamic modeling. The liquidus projection and reaction schemefor the entire system are also presented.