Enhanced Plasticity via Kinking in Cubic Metallic Nanolaminates

Abstract

Kink band formation is unexpected in cubic nanocrystalline metals but is found to occur during layer-parallel compression of bulk Cu–Nb nanolaminates produced by the accumulative roll bonding process. This deformation mechanism is strongly length scale dependent and allows for large compressive strains (>25%) at high stresses high stresses (>1 GPa) without leading to crack formation. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Fig. S1: Schematic of kink band geometry Fig. S2: Required extensional layer strain as a function of kink band geometry Fig. S3: Light optical micrographs showing relationship between kink band angles Video S1: In situ video recording of 500 nm Cu–Nb compression specimen Video S2: In situ video recording of 30 nm Cu Nb compression specimen Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.