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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
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

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