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 |
Bidirectional Transformation in a Low Energy Interface Engineered Metastable High Entropy Alloy Under Dynamic Loading |
Author(s) |
Shreya Mukherjee, Ravi Sankar Haridas, Priyanka Agrawal, Aishani Sharma, Prithvi Awasthi, Rajiv S. Mishra |
On-Site Speaker (Planned) |
Shreya Mukherjee |
Abstract Scope |
A comprehensive deformation-driven bidirectional martensitic transformation (Bi-TRIP) and the associated hierarchical substructure development were investigated in a metastable high entropy alloy (HEA) upon quasistatic and dynamic loading using detailed EBSD in conjunction with TEM. The HEA was subjected to fatigue to generate massively interfaced microstructure containing low energy interfaces (LEIs), i.e., FCC-twin boundaries, HCP-martensitic plate, and stacking faults to obtain a high-strength material. At the quasistatic regime, forward HCP martensitic transformation prevailed with interacting SFs, and Lomer-Cotrell lock formation provided sustained strain hardening. At 1300 s-1, forward ε-martensite prevailed with deformation kink band formation mainly on the pyramidal planes of the ε-martensite and surprisingly, at the intersections of two crossing ε lamellae, reverse transformation from ε martensite to FCC occurred. Further loading, the deformation bands developed into micro-shear bands consisting of nanosized twins. A constitutive modeling has been proposed to effectively simulate the mechanical flow behavior considering adiabatic temperature rise. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Shaping and Forming |