Unveiling Enhanced Properties via Microstructural Evolution in Stir-Cast Al6061 Composite Reinforced with AlCrFeNiTi High-Entropy Alloy Particles
Abstract
The viability of reinforcing the Al 6061 matrix using AlCrFeNi and AlCrFeNiTi high entropy alloy (HEA) particles is investigated. Body-centered cubic, A2, and TiC phases are observed in both alloys after 12 h of milling. In situ TiC formation happens during mechanical alloying in AlCrFeNiTi HEA powders. Selected area diffraction patterns are employed in transmission electron investigations to authenticate the presence of distinct phases, affirming their existence within the studied material. Fabricated composites exhibit evenly spaced grains with homogeneous particle dispersion. In comparison to its equivalent, a composite reinforced with AlCrFeNiTi-C particles exhibits greater grain refinement. Benefiting from dispersion strengthening and grain refinement, both metal matrix composites (MMCs) showcase enhanced attributes. In the case of Al6061/AlCrFeNiTi-C MMC, a remarkable 25% boost in ultimate tensile strength is achieved, accompanied by a substantial 141.6% improvement in hardness. The findings demonstrate the contribution of HEA particles in improving the characteristics of Al alloys.
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Source: Preview Image: Sekhar R, A., Pillai R, R., N, F., B.S, A. and N.S, F. (2024), Unveiling Enhanced Properties via Microstructural Evolution in Stir-Cast Al6061 Composite Reinforced with AlCrFeNiTi High-Entropy Alloy Particles. Adv. Eng. Mater., 26: 2400516. https://doi.org/10.1002/adem.202400516