High-throughput synthesis and corrosion behavior of sputter-deposited nanocrystalline Alx(CoCrFeNi)100-x combinatorial high-entropy alloys

High-entropy alloys (HEAs) are inherently complex and potentially span a vast composition space, making their research and discovery challenging. In the present study, high-throughput synthesis of an Alx(CoCrFeNi)100-x combinatorial material library covering x = 4.5–40 atomic percent Al is achieved,...

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Bibliographic Details
Published in:Materials & design Vol. 195; p. 109018
Main Authors: Shi, Yunzhu, Yang, Bin, Rack, Philip D., Guo, Shifeng, Liaw, Peter K., Zhao, Ying
Format: Journal Article
Language:English
Published: United States Elsevier Ltd 01.10.2020
Elsevier
Subjects:
Corrosion
High-entropy alloys
High-throughput synthesis
Magnetron sputtering
MATERIALS SCIENCE
Passive film
High-entropy alloys
High-throughput synthesis
Magnetron sputtering
Passive film
Corrosion
ISSN:0264-1275, 1873-4197
Online Access:Get full text
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Summary:High-entropy alloys (HEAs) are inherently complex and potentially span a vast composition space, making their research and discovery challenging. In the present study, high-throughput synthesis of an Alx(CoCrFeNi)100-x combinatorial material library covering x = 4.5–40 atomic percent Al is achieved, using magnetron co-sputtering. The effects of Al on the microstructure and corrosion behavior are investigated. With the increased amount of Al, crystal-structures of thin films transform from face-centered cubic (FCC) to body-centered cubic (BCC). Both the FCC and BCC thin films demonstrate a uniform elemental distribution. Corrosion characteristics of combinatorial samples immersed in the 3.5 wt% (wt%) NaCl solution are evaluated via electrochemical tests. Complementary X-ray photoelectron spectroscopy analysis reveals the compositional variation of passivated films formed on the sample surface after immersion. The results show that the Alx(CoCrFeNi)100-x HEA thin films possess outstanding corrosion-resistant properties, but the resistance diminishes with the increasing Al content. The decreased corrosion resistance is revealed to be directly related to the constituents of passivated films. [Display omitted] •High-throughput synthesis of Alx(CoCrFeNi)100-x high-entropy alloys is achieved.•The influences of Al on the microstructure and corrosion behavior are evaluated.•Alx(CoCrFeNi)100-x thin films possess outstanding corrosion-resistant properties.
Bibliography:USDOE Office of Fossil Energy (FE)
51901242; 2018M643247; DMR-1611180; 1809640; CBET-1603780; 2162026; JCYJ20160608153641020; JCYJ20180507182239617; FE-0008855; FE-0011194; FE-0024054
ISSN:0264-1275
1873-4197
DOI:10.1016/j.matdes.2020.109018