STACKING-FAULTS AND CRYSTALLITE SIZE IN MECHANICALLY ALLOYED CU-CO

Mechanically alloyed Cu-Co (5-90 wt. % Co) has been analyzed using X-r ay diffractometry to study microstructural features. All compositions were single phase face-centered cubic. Although some of the observed p eak broadening can be attributed to fine grain size and microstrain ef fects, anomalous hkl-dependent peak broadening and peak shifts are cle arly associated with stacking faults. Furthermore, the true grain size s were > 100 nm, 3-10 times the grain size calculated without consider ing stacking fault contributions.