REEXAMINATION OF THE HIGH TEMPERATURE REGION OF Fe-W BINARY ALLOY PHASE DIAGRAM.

Abstract

The temperature of two invariant reactions, Fe( alpha ) equals L plus Fe//3W//2( epsilon ) and Fe//3W//2( epsilon ) equals L plus (W), and composition of the decomposing phases were determined. Identification and composition determination of the equilibrating phases were also carried out by metallographic examination of diffusion couples and heat treated samples. FeW( sigma ) phase was not detected in the experimental temperature range. This coincides with behavior of the activity curves of Fe-W alloys reported previously. Ion intensity thermal analysis is useful for the study of high temperature transformation including the liquid phase.