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Thermodynamic model for lattice point defect-mediated semi-coherent precipitation in alloys

Abstract : The formation of precipitates with an atomic volume different from their parent phase eventually leads to a loss of the lattice continuity at the matrix/precipitate interface. Here, we show the creation or removal of lattice sites mediated by lattice point defects is an accommodation mechanism of the coherency loss and even a precipitation driving force. We introduce a thermodynamic approach that rationalizes the selection of phases resulting from chemical and crystallographic constraints in relation to point defect properties. The resulting semi-coherent phase diagram and the precipitation kinetic model depend on the equilibrium phase diagram, the eigenstrain of the precipitating phase, and the chemical potential of point defects. From a joint experimental and modeling study, we uncover the prominent role of excess point defects in unforeseen phase transformations of the Fe-Ni metallic system under irradiation. By addressing the fundamental role of lattice point defects in the accommodation mechanisms of precipitation, we provide a step torwards the understanding of semi-coherent phase transformations occurring in solid materials upon synthesis and in use.
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Submitted on : Monday, December 6, 2021 - 4:00:18 PM
Last modification on : Wednesday, June 1, 2022 - 2:28:02 PM
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Maylise Nastar, Lisa Belkacemi, Estelle Meslin, Marie Loyer-Prost. Thermodynamic model for lattice point defect-mediated semi-coherent precipitation in alloys. Communications Materials, Nature, 2021, 2, pp.32. ⟨10.1038/s43246-021-00136-z⟩. ⟨cea-03467616⟩



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