About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond II
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Presentation Title |
Phase-field Modelling of Transformation Pathways and Microstructural Evolution in MPEAs (Multi Principal Element Alloys) |
Author(s) |
Kamalnath Kadirvel, Jacob K Jensen, Zachary T Kloenne, Rajarshi Banerjee, Hamish Fraser, Yunzhi Wang |
On-Site Speaker (Planned) |
Kamalnath Kadirvel |
Abstract Scope |
Multi Principal Element Alloys with multiple phases have very good structural and functional properties. The recently developed refractory MPEA, AlMo0.5NbTa0.5TiZr, shows an interesting microstructure with ordered phase (B2) being the matrix and disordered phase (A2) being the precipitate, unlike the conventional Ni-based superalloys where the ordered phase (𝛾′) is the precipitate and the disordered phase is the matrix (γ). It becomes crucial to understand the transformation pathway leading to this microstructure in order to tailor the microstructure for specific engineering applications. We proposed a transformation pathway for the MPEA, AlMo0.5NbTa0.5TiZr, which has superior mechanical properties, and employed phase-field method to simulate the microstructural evolution which follows the pathway. The simulation results are compared with experimental observations. We also explored the role of modulus mismatch between the phases and the volume fraction of B2 phase in determining the topology of the microstructure. This work is supported by AFOSR under grant FA9550-20-1-0015. |