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

Shi, Yunzhu; Yang, Bin; Rack, Philip D.; Guo, Shifeng; Liaw, Peter K.; Zhao, Ying

doi:10.1016/j.matdes.2020.109018

Title: High-throughput synthesis and corrosion behavior of sputter-deposited nanocrystalline Al_x(CoCrFeNi)_100-x combinatorial high-entropy alloys

Journal Article · Thu Oct 01 00:00:00 EDT 2020 · Materials & Design

DOI:https://doi.org/10.1016/j.matdes.2020.109018· OSTI ID:1785699

Shi, Yunzhu ^[1]; Yang, Bin ^[2]; Rack, Philip D. ^[3]; Guo, Shifeng ^[1]; Liaw, Peter K. ^[4]; Zhao, Ying ^[1]

Chinese Academy of Sciences, Shenzhen (China). Schenzhen Inst. of Advanced Technology
Univ. of Science and Technology, Beijing (China). Collaborative Innovation Center of Steel Technology
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering

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 Al_x(CoCrFeNi)_100-x combinatorial material library covering x = 4.5–40 atomic percent Al is achieved, using magnetron cosputtering. 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 Al_x(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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: 51901242; 2018M643247; DMR-1611180; 1809640; CBET-1603780; 2162026; JCYJ20160608153641020; JCYJ20180507182239617; FE-0008855; FE-0011194; FE-0024054

OSTI ID:: 1785699

Journal Information:: Materials & Design, Vol. 195; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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

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Title: High-throughput synthesis and corrosion behavior of sputter-deposited nanocrystalline Al_x(CoCrFeNi)_100-x combinatorial high-entropy alloys