About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales III
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Presentation Title |
Confined Layer Slip in Nanolaminates: Effect of Interface Structure and Layer Thickness |
Author(s) |
Wu-Rong Jian, Shuozhi Xu, Yanqing Su, Irene J. Beyerlein |
On-Site Speaker (Planned) |
Wu-Rong Jian |
Abstract Scope |
Confined layer slip (CLS) is a predominant dislocation-based deformation mechanism that describes how a moving dislocation is confined within nanoscale multilayers. Using molecular dynamics simulation, we investigate CLS with respect to three interfaces, including the biphase Cu/Nb incoherent interface, homophase Cu/Cu incoherent interface, and homophase Nb/Nb coherent interface. In particular for the last interface, we study the layer thickness effect on CLS. The results show that the CLS of dislocations can be significantly obstructed by the misfit dislocations within the incoherent interfaces, in particular when the intersection line between the glide plane of dislocation and the interface coincides with the misfit dislocation lines. In addition, the layer thickness effect on the critical stress for CLS in nanolaminated Nb can be well described by the Hall-Petch effect due to the absence of misfit dislocation within the interface and the dislocation distribution in the neighboring layers can affect the dislocation motions. |