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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advances in Multi-Principal Element Alloys V: Mechanical Behavior
Presentation Title A study of the active deformation mechanisms in the refractory high entropy alloy Al0.33Mo0.33Nb0.33Ta0.33TiZr
Author(s) Paraic O'Kelly, Brian Welk, Gopal Viswanathan, Hamish Fraser
On-Site Speaker (Planned) Paraic O'Kelly
Abstract Scope In this work, an alloy based on Al0.33Mo0.33Nb0.33Ta0.33TiZr has been studied. The phase transformation pathway was determined, by phase-field modelling, to be congruent ordering of the bcc phase to B2, and subsequent spinodal decomposition into two distinct B2 phases – one of which congruently disordered to bcc. Experimentally the microstructure is confirmed to be B2 + bcc. Following heat-treatment of this polycrystalline alloy, coupons have been deformed in compression at room temperature. The first part of this talk details the active deformation mechanisms, which have been determined using transmission electron microscopy and trace analyses based on stereographic techniques. The second part of this talk details the application of correlative shear punch tests and stress relaxation tests to ascertain the rate-controlling steps of plastic deformation.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys, Characterization, Other

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