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- Title
Effect of Al Content on Microstructure, Mechanical, and Corrosion Properties of (Fe<sub>33</sub>Cr<sub>36</sub>Ni<sub>15</sub>Co<sub>15</sub>Ti<sub>1</sub>)<sub>100-x</sub>Al<sub>x</sub> High-Entropy Alloys.
- Authors
Qifeng Zheng; Weiyan Lu; Dong Han; Tianrun Li; Hui Guo; Keqiang Qiu; Baijun Yang; Jianqiang Wang
- Abstract
(Fe33Cr36Ni15Co15Ti1)100-xAlx (x = 0, 3, 5, 6, 7, 8) high-entropy alloys (HEAs) are prepared by arc melting. The influence of Al element addition on the microstructure, mechanical properties, and anticorrosion in 3.5 wt% NaCl aqueous solution is systematically investigated. The microstructure analysis indicates that HEAs possess varying phases from face center cubic/face-centered cubic (FCC) þ sigma to FCC þ body-centered cubic (BCC) and then FCC þ BCC þ sigma, the last to BCC þ sigma with the increase of Al content. The compressive results suggest that the Al addition exhibits a significant elevation in strength. Particularly, Al7 alloy shows a superior strength and plasticity, which presents a yield strength of 1315.3 MPa and a compressive strain over 50%. Order strengthening and coherent strengthening of nanosized phase are regarded as main strengthening effects. In addition, Al element is harmful for the corrosion resistance of (Fe33Cr36Ni15Co15Ti1)100-xAlx HEAs system, which is ascribed to the weakened passive film stability. It is also noted that pits tend to be initiated in relatively Cr-depleted phases (FCC or B2 phase) due to the inhomogeneous elemental distribution-induced galvanic corrosion. In spite of this, all HEAs exhibit superior corrosion resistance than that of 304SS.
- Subjects
FACE centered cubic structure; BODY centered cubic structure; ALLOYS; ELECTROLYTIC corrosion; MICROSTRUCTURE; NICKEL-chromium alloys; CORROSION resistance; CHROMIUM alloys; AQUEOUS solutions
- Publication
Advanced Engineering Materials, 2023, Vol 25, Issue 22, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.202301013