title: Characterization of nanoscaled heterogeneities in mechanically alloyed and compacted CuFe.
abstract: Cu80Fe20 and Cu50Fe50 were mechanically alloyed from the pure elements by ball milling for 36 h. The alloy powder was compacted into tablets at room temperature by applying a pressure of 5 GPa. Characterization of the Cu80Fe20) and Cu50Fe50 alloys was carried out by high-resolution transmission electron microscopy (HREM), atom probe field ion microscopy and three-dimensional atom probe (3DAP). The grain size of the nanocrystalline microstructure of the ball-milled alloys observed with HREM varies between 3 and 50 nm. Atom probe and 3DAP measurements indicate that the as-prepared state is a highly supersaturated alloy, in which the individual nanocrystals have largely varying composition. Fe concentration in Cu was found to range from about 8 to 50 at%. It is concluded that by ball milling and compacting an alloy is produced which on a nanometer scale is heterogeneous with respect to morphology and composition.
authors.affiliation: Hahn-Meitner-Institut Berlin, Germany. wanderka@hmi.de
authors.forename: N
authors.initials: N
authors.lastname: Wanderka
authors.forename: U
authors.initials: U
authors.lastname: Czubayko
authors.forename: V
authors.initials: V
authors.lastname: Naundorf
authors.forename: V A
authors.initials: VA
authors.lastname: Ivchenko
authors.lastname: Yermakov AYe
authors.forename: M A
authors.initials: MA
authors.lastname: Uimin
authors.forename: H
authors.initials: H
authors.lastname: Wollenberger