J. Phys. Colloques
Volume 49, Numéro C6, Novembre 198835th International Field Emission Symposium / 35éme Symposium International d'Emission de Champ
|Page(s)||C6-317 - C6-322|
J. Phys. Colloques 49 (1988) C6-317-C6-322
ATOM PROBE MICROANALYSIS OF THE METALLIC GLASSESZ.G. LIU1, Y. CHEN1 et X.J. WU2
1 The Laboratory of Solid State Microstructures, Nanjing University, Nanjing, People's Republic of China
2 Institute of Solid State Physics, Academia Sinica, People's Republic of China
The chemical inhomogeneities over the order of nanometers in two transition metal-metalloid amorphous alloys have been investigated by means of atom probe field ion microscopy (APFIM). In as quenched Fe82.3Ni1-7 B16 glass the existence of two amorphous phases with different boron concentrations was revealed. The mean size of the precipitated (FeNi)3 B-phase was determined to be about 3 nanometers. The interface between the two phases seems to be rather distinct. However, in as quenched or at 350° C for an hour annealed Fe80.7B12.8Si3.8 C2.6-glass, no regions depleted or enriched in one component detectable can be found. In annealing the glass kept homogeneous on the scale of nanometer, although the specimen underwent a ductile-brittle transition. It was concluded that in this metallic glass phase separation is not involved in the annealing embrittlement.