J. Phys. Colloques
Volume 50, Numéro C8, Novembre 198936th International Field Emission Symposium
|Page(s)||C8-413 - C8-418|
J. Phys. Colloques 50 (1989) C8-413-C8-418
AN ATOM PROBE FIELD-ION MICROSCOPY STUDY OF PHASE SEPARATION IN THE TWIN CITY AND SANTA CATHARINA METEORITESM.K. MILLER et K.F. RUSSELL
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, U.S.A.
An atom probe field-ion microscopy investigation of the Twin City and Santa Catharina meteorites has revealed that the matrix of these meteorites has an ultra-fine scale two phase microstructure. The results indicate the presence of precipitates with an interparticle spacing of between 7.5 and 20 nm and amplitude fluctuations from 50 at. % Ni to approximately 15 at. % Ni. This evidence indicates that the matrix of these meteorites is a mixture of L10-ordered FeNi and a low nickel face centered cubic phase.