|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Two Different Pathways to Produce Novel Cu-based Nanostructured Alloys with Enhanced Strength and Ductility
||Keith Dusoe, Thomas Bissell, Sriram Vijayan, Mark Aindow, Seok-Woo Lee
|On-Site Speaker (Planned)
Grain size reduction to the nanometer scale has been used to produce an ultra-high strength metal such as nanocrystalline metals or nanostructured alloys. In this study, we introduce two different pathways to produce novel Cu-based ternary nanostructured alloys with unique microstructures. Cu-Zr-Ti and Cu-Zr-Al metallic composites were synthesized by rapid solidification technique. Cu-Zr-Ti alloys possess two different phases (Cu and intermetallic), but Cu-Zr-Al alloys possess three different phases (Cu, intermetallic, and nanocrystalline). Quasi-static uniaxial compression tests revealed the high compressive yield strength near 2 GPa, which is comparable to those of Cu-base bulk metallic glasses, and the exceptional ductility near 10%. The superior mechanical properties were investigated in terms of the unique deformation mechanisms, phase boundary sliding and crack deflection, by using scanning and transmission electron microscopy. The two different pathways of phase formation will be discussed in terms of the relative difference in heat of mixing between constituent elements.