Date/Time: 04-23-2019 - Tuesday - 05:00 PM - 07:00 PM
Rohit Berlia1 Jagannathan Rajagopalan1

1, Arizona State University, Tempe, Arizona, United States

The deformation behavior of nanostructured metallic multilayers has been extensively investigated because of their superior mechanical properties, primarily via nanoindentation and micropillar compression experiments. Here, we report tensile measurements on a Cu/Co nanolaminate with 4 nm layer spacing. The nanolaminate was synthesized using magnetron sputtering at room temperature and tensile loading-unloading cycles were performed on freestanding samples parallel to the Cu/Co interface using MEMS devices. Cross-sectional TEM and XRD measurements showed the presence of a coherent Cu/Co interface. The nanolaminates exhibit a flow strength as high as 2 GPa and failure strains of 3-4%. Interestingly, significant inelastic strain recovery was observed both during and after unloading, with further recovery occurring upon heating. In addition, the stress-strain slope during the initial stages of unloading was considerably higher than the expected elastic modulus, suggesting the presence of a super modulus effect due to the large coherency strain.

Meeting Program

Symposium Sessions

5:00 PM–7:00 PM Apr 23, 2019 (US - Arizona)

PCC North, 300 Level, Exhibit Hall C-E