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Microstructural evolution, electrochemical and corrosion properties of AlxCoCrFeNiTiy high entropy alloys

Qiu, Y., Thomas, S., Fabijanic, D., Barlow, A. J., Fraser, H. L. and Birbilis, N. 2019, Microstructural evolution, electrochemical and corrosion properties of AlxCoCrFeNiTiy high entropy alloys, Materials and Design, vol. 170, pp. 1-15, doi: 10.1016/j.matdes.2019.107698.

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Title Microstructural evolution, electrochemical and corrosion properties of AlxCoCrFeNiTiy high entropy alloys
Formatted title Microstructural evolution, electrochemical and corrosion properties of AlxCoCrFeNiTiy high entropy alloys
Author(s) Qiu, Y.
Thomas, S.
Fabijanic, D.ORCID iD for Fabijanic, D. orcid.org/0000-0003-4857-0398
Barlow, A. J.
Fraser, H. L.
Birbilis, N.
Journal name Materials and Design
Volume number 170
Start page 1
End page 15
Total pages 15
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2019-05-15
ISSN 0264-1275
1873-4197
Keyword(s) High entropy alloys
Compositionally complex alloys
Scanning transmission electron microscopy
Potentiodynamic polarisation
XPS
Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
MECHANICAL-PROPERTIES
THERMAL-STABILITY
PHASE-TRANSITION
WEAR BEHAVIOR
AL ADDITION
MAGNESIUM
ALUMINUM
ELEMENTS
BARRIER
Summary The microstructure of the AlxCoCrFeNiTiy high entropy alloy (HEA) system was studied using X-ray diffraction, scanning and transmission electron microscopy. A microstructural evolution from single-phase FCC to FCC + BCC + B2 occurred with increasing Al content. The addition of a comparatively small amount of Ti led to the formation of a Fe-Cr sigma phase. The corrosion characteristics of the alloy system were studied across different compositions, with such an alloy system exhibiting a high resistance to general corrosion, superior to stainless steel 304L in 0.6 M NaCl. Cyclic potentiodynamic polarisation suggested that the HEAs studied underwent pitting corrosion following breakdown. From exposure testing, it was seen that very fine pitting, although not extensive in nature, was the principle form of corrosion for AlxCoCrFeNiTiy after prolonged immersion. There was little evidence of microgalvanic corrosion or selective dissolution of a particular phase observed, despite the heterogeneous microstructure and significant elemental segregation in the alloys studied. The composition of the surface films formed upon the AlxCoCrFeNiTiy alloys were elaborated by X-ray photoelectron spectroscopy, which provided new and further insights regarding the surface films of such alloys. The study herein contributes to an emerging understanding of the corrosion characteristics of high entropy alloys.
Language eng
DOI 10.1016/j.matdes.2019.107698
Indigenous content off
Field of Research 0912 Materials Engineering
0913 Mechanical Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2019, The Authors
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30120784

Document type: Journal Article
Collections: Institute for Frontier Materials
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GTP Research
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.