We investigate the interfaces and mechanical properties of sputtered, highly (1 0 0) and (1 1 1) textured Cu/Co multilayers. In (1 0 0) Cu/Co multilayers, Co has primarily face-centered-cubic (FCC) structure and high density of inclined stacking faults (SFs). In contrast in (1 1 1) textured Cu/Co, dependent on layer thickness, high density SFs and twins parallel to layer interface are observed. When individual layer thickness, h, is a few nanometers, both systems have fully coherent FCC interface. (1 1 1) Cu/Co has similar size dependent strengthening and peak hardness compared to (1 1 1) Cu/Ni multilayers. The peak strength of (1 0 0) Cu/Co may be dominated by the transmission of partial dislocations across interface, and hence it is lower than the peak strength of (1 0 0) Cu/Ni, which is dictated by transmission of full dislocations across interfaces.
Bibliographical noteFunding Information:
We acknowledge financial support by NSF-DMR , under Grant No. 0644835 , and partial financial support by NSF-CMMI 1129065 . J. Chen acknowledges the NSFC (Grant No. 50801036 ) for part of financial support for the collaboration. Access to the microscopes at the Microscopy and Imaging Center at Texas A&M University is also acknowledged.
- A. Partial dislocations
- A. Stacking faults
- A. Strengthening
- A. Twins
- B. Cu/Co multilayers