About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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Presentation Title |
Rate and Temperature Dependent Nanomechanical Transitions in a Transformative Multi-Principal Alloy |
Author(s) |
Abhijeet Dhal, Shreya Mukherjee, Roopam Jain, Ravi Sankar Haridas, Amit Arora, Rajiv Mishra |
On-Site Speaker (Planned) |
Abhijeet Dhal |
Abstract Scope |
The pop-in phenomenon, a critical event in nanomechanical testing, represents spontaneous material displacement and is often linked to phase transformations. In this study, we investigated the rate and temperature-dependent nanomechanical behavior of a transformative multi-principal element alloy (MPEA) with the composition Fe37.5Mn20Co20Cr15Si5Cu1.5 (at.%). Utilizing nanoindentation techniques, we observed distinct pop-in events, indicative of nanomechanical transitions with varying strain rates and temperatures. At lower strain rates and/or temperatures, transformation-based plasticity was dominant. Conversely, at higher strain rates and temperatures, the material exhibited twin- and glide-based plasticity, underscoring a shift in the dominant deformation mode. This rate and temperature sensitivity aligns with the Arrhenius thermal activation model, providing a framework for understanding the underlying thermomechanical behavior. This study not only elucidates the complex interplay between evolving plasticity phenomenon in MPEAs but also offers insights for the design and application of MPEAs in environments subjected to varying mechanical and thermal loads. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Phase Transformations, Mechanical Properties |