Grand canonically optimized grain boundary phases in hexagonal close-packed titanium

Enze Chen (), Tae Wook Heo, Brandon C. Wood, Mark Asta and Timofey Frolov ()
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Enze Chen: University of California
Tae Wook Heo: Lawrence Livermore National Laboratory
Brandon C. Wood: Lawrence Livermore National Laboratory
Mark Asta: University of California
Timofey Frolov: Lawrence Livermore National Laboratory

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Grain boundaries (GBs) profoundly influence the properties and performance of materials, emphasizing the importance of understanding the GB structure and phase behavior. As recent computational studies have demonstrated the existence of multiple GB phases associated with varying the atomic density at the interface, we introduce a validated, open-source GRand canonical Interface Predictor (GRIP) tool that automates high-throughput, grand canonical optimization of GB structures. While previous studies of GB phases have almost exclusively focused on cubic systems, we demonstrate the utility of GRIP in an application to hexagonal close-packed titanium. We perform a systematic high-throughput exploration of tilt GBs in titanium and discover previously unreported structures and phase transitions. In low-angle boundaries, we demonstrate a coupling between point defect absorption and the change in the GB dislocation network topology due to GB phase transformations, which has important implications for the accommodation of radiation-induced defects.

Date: 2024
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DOI: 10.1038/s41467-024-51330-9

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