Enhanced Strength–Ductility Synergy of Fine-Grained AlCoCrFeNi High-Entropy Alloy Prepared by Heavy Hot Deformation
Sujun Lu, Jingou Yin, Zhenyu Dou, Ming Wei, Jian Wang, Xintao Zhang, Baoguang Zhang
TL;DR
Fine-grained AlCoCrFeNi high-entropy alloy shows improved strength and ductility due to its unique microstructure and grain boundaries.
Contribution
A novel method of heavy hot deformation is used to refine grains in AlCoCrFeNi HEA, enhancing its mechanical properties.
Findings
Fine-grained AlCoCrFeNi HEA exhibits enhanced strength and ductility compared to coarse-grained versions.
Grain refinement is achieved through heavy thermal mechanical processing, not solidification methods.
The synergy of strength and ductility is due to microstructure, crack initiation delay, and crack propagation impediment.
Abstract
The mechanical properties of the AlCoCrFeNi high-entropy alloy (HEA) can be significantly enhanced by grain refinement. However, it is difficult to refine the grain size of AlCoCrFeNi HEA by solidification methods. In this study, fine-grained AlCoCrFeNi HEA was successfully prepared by heavy thermal mechanical processing. The AlCoCrFeNi HEA consists of FCC, B2, and BCC phases. The FCC phase is distributed on grain boundaries, while the B2 phase is embedded in the BCC matrix within the grains. The fine-grained AlCoCrFeNi HEA has enhanced strength and ductility compared with its coarse-grained counterpart. The enhanced strength–ductility synergy of the fine-grained AlCoCrFeNi HEA is attributed to three key factors: the fine-grained microstructure, the delayed initiation of cracks within the hard-to-deform grain matrix, and the impediment of crack propagation by the grain boundaries…
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Taxonomy
TopicsHigh Entropy Alloys Studies · Additive Manufacturing Materials and Processes · Magnesium Alloys: Properties and Applications