Yuqi Liu, Feng Wang, Songyang Chen, Hui Wang, Zhiping Xiong, Khurram Yaqoob, Zhangwei Wang, Min Song
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Thermal Stability and Strengthening Effect of Coherent Precipitates in a (FeCoNi)92Al2.5Ti5.5 High Entropy Alloy
The coarsening behavior and strengthening effect of L12-Ni3(Ti,Al) precipitates in a face-centered-cubic (FCC) (FeCoNi)92Al2.5Ti5.5 high entropy alloy have been systematically investigated. The coherent L12 precipitates, uniformly distributed throughout the FCC matrix, consistently retain a spherical shape. The coarsening rate coefficient of precipitate is determined by employing the Philippe-Voorhees (PV) model, suggesting excellent thermal stability. Furthermore, the elemental partitioning and compositional evolution of the L12 precipitates is analyzed by atom probe tomography, which identify aluminum (Al) as the slowest diffusion species during the coarsening process. In addition, the precipitation strengthening effect is quantified to ascertain the optimal size of the precipitates. Our study enhances the understanding of precipitate coarsening in high entropy alloys, presenting valuable insights into their thermal stability and mechanical properties.
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This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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