Bulk large-gradient nanostructured NiCoCrFe high-entropy alloys with millimeter-scale gradient layer were prepared by supersonic Taylor impact. The microstructure evolution over a wide range of strain rates (10−3–105/s) was characterized, and the formation mechanism of nanocrystals with well-defined boundaries at high strain rate (>104/s) was identified to be the emerging, thickening, and mutual intersection of lattice rotation bands, high-density dislocation bands, and deformation twins. This Letter not only reveals the deformation mechanisms of high entropy alloys under a wide range of strain rates but also provides an idea that could be applied to the preparation of bulk gradient nanostructured materials.
Formation and deformation mechanisms in gradient nanostructured NiCoCrFe high entropy alloys upon supersonic impacts
Note: This paper is part of the APL Special Collection on Metastable High Entropy Alloys.
Zhihua Wang, Tuanwei Zhang, Enling Tang, Renlong Xiong, Zhiming Jiao, Junwei Qiao; Formation and deformation mechanisms in gradient nanostructured NiCoCrFe high entropy alloys upon supersonic impacts. Appl. Phys. Lett. 15 November 2021; 119 (20): 201901. https://doi.org/10.1063/5.0069402
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