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http://hdl.handle.net/10397/106377
Title: | Microstructures and mechanical properties of CoCrFeMnNiVₓ high entropy alloy films | Authors: | Fang, S Wang, C Li, CL Luan, JH Jiao, ZB Liu, CT Hsueh, CH |
Issue Date: | 15-Apr-2020 | Source: | Journal of alloys and compounds, 15 Apr. 2020, v. 820, 153388 | Abstract: | In the present work, CoCrFeMnNiVx (x = 0, 0.07, 0.3, 0.7, 1.1) high entropy alloy films were fabricated by magnetron co-sputtering. For low contents of V, typical face-centered cubic (fcc) peaks were identified in X-ray diffraction patterns. With the increasing V content, the diffraction peaks became broadened and the formation of an amorphous phase was promoted. TEM observations showed abundant nanotwins in the films with low V contents and the transition from fcc to the amorphous structure with the increasing V content. Mechanical properties of the films were studied using nanoindentation and micro-pillar compression tests. The films exhibited a high hardness ranging from 6.8 to 8.7 GPa. The serrated flow associated with shear banding showed in the stress-strain curves for films with x ≥ 0.3. When x = 0.07, the excellent yield strength of 3.79 GPa and ultimate compressive strength of 4.93 GPa were achieved with little sacrifice in ductility. The presence of nanotwins contributed to the strain hardening effect. | Keywords: | Entropy Mechanical properties Microstructure Nanostructured materials Thin films |
Publisher: | Elsevier BV | Journal: | Journal of alloys and compounds | EISSN: | 0925-8388 | DOI: | 10.1016/j.jallcom.2019.153388 | Rights: | © 2019 Elsevier B.V. All rights reserved. © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Fang, S., Wang, C., Li, C. L., Luan, J. H., Jiao, Z. B., Liu, C. T., & Hsueh, C. H. (2020). Microstructures and mechanical properties of CoCrFeMnNiVx high entropy alloy films. Journal of Alloys and Compounds, 820, 153388 is available at https://doi.org/10.1016/j.jallcom.2019.153388. |
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