|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Mechanical Anisotropy and Kink Banding in Bulk Accumulative Roll Bonded Cu-Nb Nanolaminates
||Thomas Nizolek, Nathan A Mara, Irene J. Beyerlein, Jaclyn T. Avallone, Tresa M Pollock
|On-Site Speaker (Planned)
Advances in the severe plastic deformation process of accumulative roll bonding (ARB) have enabled the synthesis of bulk (4 mm x 10 cm x 100’s cm) Cu-Nb nanolaminates with layer thicknesses ranging from the millimeter to nanometer scale. While tremendous increases in strength are achieved through refining the layered microstructure and increasing the density of interphase interfaces, Cu-Nb nanolaminates become increasingly plastically anisotropic as the layer thickness falls below 250 nm. This anisotropy drives a form of inhomogeneous deformation, known as kink banding, which occurs during layer-parallel compression. This deformation mode has been studied using a combination of post-test metallography, in situ microscopy, and strain mapping using digital image correlation (DIC). New insights into the stages of kink band formation will be discussed, with emphasis on the relationship between morphology, local shear strain, and geometrically required accommodation strains.