About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2026 - In-Situ Characterization Techniques
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| Presentation Title |
In-situ TEM Observation of Nanoplasticity of High Entropy MXenes |
| Author(s) |
Yuxiang Gan, Reza Namakian, Congjie Wei, Sisi Xiang, Kelvin Y. Xie, Brian C. Wyatt, Babak Anasori , Wei Gao, Chenglin Wu |
| On-Site Speaker (Planned) |
Yuxiang Gan |
| Abstract Scope |
Material fracture is often an irreversible, catastrophic event, especially in low-dimensional materials where atomic-scale thickness leads to enhanced brittleness despite high strength. In this work, we discovered that the mechanical resilience of MXenes particularly high-entropy compositions can be significantly enhanced via intrinsic nanoplasticity. Using in-situ high-resolution transmission electron microscopy (HR-TEM), we directly observe dislocation nucleation, and evolution in real time under electron beam-induced residual stress. Unlike traditional brittle fracture, cracks in TiVCrMoC₃ MXenes emit dislocations that relieve stress and delay propagation. This sequential sliding and fracture process absorb energy through lattice reconstrcution and slip without compromising structural integrity. In contrast, low-entropy Mo₂Ti₂C₃, Mo₂Nb₂C₃ MXenes exhibit amorphization under stress, lacking such plastic accommodation. Our findings are further supported by atomic modeling and crystallographic slip system analysis, confirming that high-entropy induced disorder promotes active dislocation mechanisms and structural adaptability. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, |