About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
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Presentation Title |
In-situ TEM Observation of Shear Induced Microstructure Evolution in Cu-Nb Alloy |
Author(s) |
Shuang Li, Matthew Olszta, Lei Li, Bharat Gwalani, Ayoub Soulami, Cynthia A Powell, Suveen Mathaudhu, Arun Devaraj, Chongmin Wang |
On-Site Speaker (Planned) |
Shuang Li |
Abstract Scope |
Phase boundaries in multiphase alloys govern defect interaction and chemical intermixing across different phases during plastic deformation. Dynamic interaction of defects with phase boundaries in multiphase alloys, especially for immiscible alloys, has been topic of significant research interest in recent years. Here, we describe a novel approach for carrying out in-situ TEM shear deformation to directly observe interfacial microstructural evolution of a Cu-Nb alloy. A unique double shear specimen geometry is microfabricated by a FIB technique to apply shear deformation upon push loading inside the TEM. From the real-time observation, we discover that the phase boundary with a zigzag morphology effectively blocks stacking faults nucleated in a Cu grain from slipping into a Nb grain. Meanwhile, the Cu phase bears the most plastic deformation through slip or twinning mechanisms. This work sheds light on understanding the shear deformation and the behavior of phase boundaries in multiphase alloys during shear deformation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Copper / Nickel / Cobalt, Mechanical Properties, |