IDENTIFICATION AND CHARACTERIZATION OF A NOVEL INTERMETALLIC COMPOUNDIN A -CR-5WT-PERCENT-NI-3WT-PERCENT-MO-0.03WT-PERCENT-C

A new intermetallic compound labelled the tau-phase with an orthorhomb ic structure (a = 0.4044 nm, b = 0.3436 nm and c = 0-2867 nm) is forme d throughout the 8 matrix during isothermal heat treatment in the temp erature range below 650-degrees-C. The face-centred orthorhombic Brava is lattice and Fmmm space group are established by electron microdiffr action in conjunction with group theory analysis. The tau-phase crysta l lattice is oriented with respect to the surrounding delta matrix acc ording to the Bain orientation relationship. The defects inside tau pa rticles were analysed as sequence faults.