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- W4284959451 abstract "Controversial experimental reports on the crystal structure of T1 precipitates in Al-Li-Cu alloys have existed for a long time, and all of them can be classified into five models. To clarify its ground-state atomic structure, herein, we have combined high-throughput first-principles calculations and CALPHAD, as well as aberration-corrected HAADF-STEM experiments. Employing the special quasi-random structure (SQS) and supercell approximation (SPA) methods to simulate the local disorder on Al-Cu sub-lattices, we find that none of the present models can satisfy the phase stability in Al-Li-Cu ternary system based on temperature-dependent convex hull analysis. Using the cluster expansion (CE) formulas, structural predictions derived from the five-frame models were performed. Subsequently, by introducing the vibrational contribution to the free energy at aging temperatures, we proposed a novel ground-state T1 structure that maintains a coherent relationship with Al-matrix at the 〈112〉Al orientation. The underlying phase transition between the variants of T1 precipitates was further discussed. By means of ab initio molecular dynamics (AIMD) simulations, we resolved the controversy regarding the number of atomic layers constituting the T1 phase and acknowledged the existence of Al-Li corrugated layers. The root cause of this structural distortion is triggered by atomic forces and bondings. Our work can have an positive impact on the novel fourth generation of Al-Cu-Li alloy designs by engineering the T1 strengthening phase." @default.
- W4284959451 created "2022-07-10" @default.
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- W4284959451 date "2023-01-01" @default.
- W4284959451 modified "2023-10-01" @default.
- W4284959451 title "Identifying the crystal structure of T1 precipitates in Al-Li-Cu alloys by ab initio calculations and HAADF-STEM imaging" @default.
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- W4284959451 doi "https://doi.org/10.1016/j.jmst.2022.05.056" @default.
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