Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 894, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162413
Keywords
High-entropy alloys (HEAs); Multi-principal element alloys (MPEAs); Nanostructured materials; Phase transformations; Severe plastic deformation (SPD); High-pressure torsion (HPT)
Categories
Funding
- MEXT, Japan [19H05176, 21H00150]
- Grants-in-Aid for Scientific Research [21H00150] Funding Source: KAKEN
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Dual-phase HEAs have attracted significant attention due to their promising mechanical properties, and experimental investigation on the AlFeCoNiCu alloy reveals diverse microstructural evolution behaviors of the two phases during plastic deformation, leading to a high microhardness of 495 Hv under high-pressure torsion.
Following the introduction of high-entropy alloys (HEAs) with five or more principal elements, dual-phase HEAs have recently received significant attention due to their promising mechanical properties. Theoretical simulations suggest that unique mechanical properties of these alloys arise due to the contribution of localized phase transformation and diverse microstructural behavior of two phases under plastic de-formation. In this study, phase transformations and microstructural evolution in a dual-phase AlFeCoNiCu alloy is investigated experimentally during plastic deformation using the high-pressure torsion (HPT) method. The two BCC and FCC phases exhibit diverse behaviors under plastic straining. The FCC phase with low stacking fault energy forms numerous nanotwins and stacking faults and its lattice is expanded by 3 vol %. The BCC phase accumulates dislocations, and its lattice is contracted by 5 vol%. These diverse micro-structural/structural evolutions, which are partly consistent with the predictions of theoretical simulations, lead to a high microhardness of 495 Hv in this dual-phase HEA. (c) 2021 Elsevier B.V. All rights reserved.
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