THE EQUILIBRIUM DIAGRAM OF Fe-Al-Si SYSTEM

Abstract

By means of microscopic observation as well as thermal, X-ray, magnetic and dilatometric analyses, the constitution of thernary alloys of Fe-Al-Si system was thoroughly investigated, and the equi ibrium diagram of the whole system was determined. In this system, there exist six phases of ternary compound, corresponding approximately to the chemical formula, Fe3Al2Si2, Fe6Al12Si5, Fe5Al9Si5, FeAl3Si2, Fe6Al15Si5 and FeAl4Si, respectively, all being formed by a ternary peritectic reaction There occur the following ninteen nonvariant reactions:- The changes of A2 points in α-phase and the binary peritectoid reaction, α+ρ(FeSi) σ(Fe3Si2), were also studied.