Microstructural characterization by TEM techniques of mechanically alloyed FeNbGe powders

Mechanically alloyed Fe75Nb5Ge20 alloys have been studied using different TEM techniques. For short milling times the microstructure of the system consists of an inhomogeneous mixture of the starting crystalline phases: small bcc Fe nanocrystallites, filament-like bcc Nb and spherical fcc Ge. After long milling times, the microstructure consists of a single bcc supersaturated solid solution Fe(Nb,Ge) phase.