Mechanism research on nanoscale circumferential repetitive friction and wear of the duplex full lamellar TiAl alloys

M Zheng and BQ Yi and DF Qu and ZL Zhao and HW Liu and DL Luo and ZX Zhu, INTERMETALLICS, 183, 108819 (2025).

DOI: 10.1016/j.intermet.2025.108819

The duplex full lamellar (DFL) TiAl alloys are widely used in aerospace and other defense fields by virtue of their low density, creep resistance, oxidation resistance and exceptional mechanical properties at high temperatures, but there are still gaps in the research related to their friction and wear. In this paper, the friction response and mechanical properties during the friction process are systematically investigated by using molecular dynamics (MD) simulations in combination with tribological experiments at different temperatures. It has been found that the alpha 2 phase exhibits higher friction and friction coefficients with more drastic fluctuations. The friction force and friction coefficient at the interface (especially at the alpha 2/gamma interface) are greater than those of the single phase due to the complexity of the microstructure and the high shear strength. The alpha 2 phase leads to more severe wear scars (large increase in depth/width), roughness and wear rate due to its hard and brittle properties, while the gamma phase enhances wear resistance through plastic deformation. It is also found that oxidative and abrasive wear are the main wear mechanisms, with the oxide layer and friction film directly affecting the way the material is removed and deformed.

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