%0 Journal Article
%T In-situ observation of dislocation dynamics near heterostructured interfaces
%A Chongxiang Huang
%A Hao Zhou
%A Heinz Werner H£¿ppel
%A Kei Ameyama
%A Lirong Xiao
%A Mathias G£¿ken
%A Xiaodong Han
%A Xiaolei Wu
%A Xiaolong Ma
%A Xuechao Sha
%A Yuntian Zhu
%J Materials Research Letters
%D 2019
%R https://doi.org/10.1080/21663831.2019.1616330
%X ABSTRACT There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu¨Cbrass heterostructured TEM film Frank¨CRead sources are the primary dislocation sources. They were dynamically formed and deactivated throughout the deformation in grain interior, which has never been reported before. This observation indicates that strain gradient near interfaces cannot be quantitatively related to the density gradient of geometrically necessary dislocations, and it was primarily produced by Frank¨CRead source gradient instead of dislocation pile-ups. These findings provide new insights on how to design heterostructured interfaces to enhance mechanical properties. GRAPHICAL ABSTRAC
%U https://www.tandfonline.com/doi/full/10.1080/21663831.2019.1616330