Miscibility gap of the Fe-NiAl system relative to the physical properties of alloys. I. Alloys with a high NiAl intermetallic compound content

A determination of the miscibility gap boundary at low temperatures on the NiAl intermetallic compound phase field side of the Fe-NiAl system is prese nted. A close study of the beta-NiAl phase field is performed using differe nt physical property measurements and the determination of the phases occur ring. The changes of micro-hardness, density, magnetization, coercive force and lattice parameter were measured for these alloys. In addition, X-ray d iffraction and transmission electron microscopy analysis have been performe d to characterize the microstructure. This analysis clearly reveals at low temperatures the solubility limit of iron in the intermetallic compound NiA l.