Dresden 2017 – wissenschaftliches Programm
MM 30: Topical session: Interface-Controlled Microstructures: Mechanical Properties and Mechano-Chemical Coupling - Structure and Deformation II
MM 30.5: Vortrag
Dienstag, 21. März 2017, 12:45–13:00, BAR 205
Deformation behavior in multilayered thin films with different interface structures under sliding contact — •Ankush Kashiwar1, Zhao-Ping Luo2, Xiaoke Mu1, Horst Hahn1, Ruth Schwaiger1,3, and Christian Kübel1,3 — 1Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 2Shenyang National Laboratory for Materials Science, Shenyang 110016, China — 3Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
The presented study aims at investigating the deformation structure under sliding contact in multilayered systems with different interface structures. Cyclic sliding experiments were performed on sputtered nanocrystalline metallic multilayers with semi-coherent (Au/Cu) and incoherent (Cu/Cr) interfaces. The deformed microstructure was investigated using automated crystal orientation mapping (ACOM) in a transmission electron microscope. It is revealed that Au/Cu multilayers with a high density of twins deform by de-twinning and grain growth with a simultaneous vortex-like co-deformation and mechanical intermixing between Au and Cu layers. In case of Cu/Cr multilayers, a significant grain growth is observed in all the Cu layers and the grain size increases with the increasing number of loading cycles, whereas there is no noticeable change in the grain sizes in the Cr layers. Unlike Au/Cu multilayers, the phase maps show sharp boundaries between Cu and Cr layers, indicating no intermixing between the layers.