About this Abstract |
Meeting |
2025 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 |
Influence of Non-Uniaxial Bending on Twinning and Phase Transformation in Molybdenum Nanowires |
Author(s) |
Sicheng Qian, Afnan Mostafa, Feitao Li, Eugen Rabkin, Niaz Abdolrahim |
On-Site Speaker (Planned) |
Sicheng Qian |
Abstract Scope |
Twining and phase transformation are crucial mechanisms for enhancing strength and ductility of metals, traditionally studied under uniaxial loading with limited focus on non-uniaxial loading. This study investigates the impact of non-uniaxial loading on these mechanisms in molybdenum(Mo) nanowires with novel bending mechanisms: mono-directional (x-axis), bi-directional bending (x/y-axes). Atomistic simulations reveal a phase transformation from bcc to fcc to re-oriented bcc in [100]- and [110]-oriented molybdenum nanowires under both bending modes. Bi-directional bending forms tetra-twin boundaries (TTBs) in {112} slip systems, while mono-directional bending activates {110} slip systems without TTB formation. These findings highlight the role of metastable fcc in lattice reorientation and necessity of multi-directional bending for TTB formation. Experimental validation using [100]-, [110]-, and [111]-oriented Mo cantilevers fabricated via focused ion beam and examined in transmission electron microscopes, corroborates the simulation results. This research provides valuable insights for designing high-strength and ductile bcc nanomaterials applicable across various fields. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Phase Transformations, Nanotechnology |