|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Texture Dependent Grain Rotations in Ultrafine-grained Al Films Revealed by In Situ TEM with Automated Crystal Orientation Mapping
||Ehsan Izadi, Jagannathan Rajagopalan
|On-Site Speaker (Planned)
Several studies have shown that ultrafine-grained (UFG) metal films with dissimilar textures exhibit contrasting mechanical behavior, which suggests that their underlying deformation mechanisms are also different. To reveal these mechanisms, we used a custom MEMS device to perform in-situ TEM tensile experiments on a non-textured and a bicrystalline (two grain variants) UFG aluminum film with automated crystal orientation mapping. Our experiments show extensive rotations in a majority of grains in the non-textured film during loading. These rotations are partially or fully reversible in a significant fraction of grains during unloading, leading to notable inelastic strain recovery. The bicrystalline film exhibited less pervasive grain rotations during loading and no change in the averaged grain rotation during unloading. Furthermore, grain rotations in the bicrystalline film were accompanied by a reduction in misorientation between grains of the same variants, which suggests that elimination of low angle grain boundaries could be driving these rotations.
||Planned: Supplemental Proceedings volume