Effects of orientation on fatigue crack propagation of Ni₃Al under super-gravity by molecular dynamics simulation

L Ma and LQ Zeng and CS Li and WY Hu, AIP ADVANCES, 13, 065118 (2023).

DOI: 10.1063/5.0153183

The effects of orientation on fatigue crack propagation of Ni3Al alloys under the super-gravity condition were studied by using the molecular dynamics method. The research found that the crack initiation and propagation mechanisms were different for different orientation crack models: the 001(010) crack germinated in the form of blunting damage and voids and the 110(110) crack began initiation as blunting damage and slip bands. For the 112(111) crack, the initiation mechanisms of the crack were the same as the 110(110) crack. In the crack propagation stage, the main deformation mechanisms of all crack models were slip bands, but the slip directions were different: the 001(010) crack and 112(111) crack presented ductile cracking and the 110(110) crack presented brittleness fracture. Then, the crack growth rate and stress intensity factor were also analyzed under the super-gravity condition. The results showed that the 112(111) crack had the slowest growth rate compared to other two cracks under the super-gravity condition, and the 112(111) crack had the maximum stress intensity factor variable at initiation, but the variation tendency of stress intensity factors was slowest for the 112(111) crack under the super- gravity condition.

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