Lattice Parameters of Martensite and Austenite in Fe–Ni Alloys

Abstract

The lattice parameters of the body-centered cubic phase (martensite) and the face-centered cubic phase (austenite) were determined for a series of Fe–Ni alloys. Compositions ranged from pure Fe to Fe-35 at.% Ni. Careful film and diffractometer Debye-Scherrer techniques on powder and bulk samples and computerized calculations and error analyses were employed. Results indicate that the martensite lattice parameter reaches a maximum between 10 and 20 at.% Ni and the room-temperature lattice parameter of the face-centered cubic phase has a maximum in alloys having greater than 35 at.% Ni.