Journal
CORROSION SCIENCE
Volume 133, Issue -, Pages 120-131Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.01.030
Keywords
Alloys; AFM; Segregation; Pitting corrosion
Funding
- U.S. Department of Energy, Basic Energy Sciences, Scientific User Facilities Division
- U.S. Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0024054, DE-FE-0011194]
- National Science Foundation [DMR-1611180]
- 863 Program of China [2008AA031702, 2012AA03A507]
- China Scholarship Council
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The present work investigates the homogenization effect of 1250 degrees C heat treatment on the AlxCoCrFeNi high-entropy alloys (HEAs). The multi-phase microstructures with chemical segregations are inevitable with the increased Al content in the alloys, which cause work function variations and localized corrosion. After heat treatment, the homogenization effect revealed by the microstructure simplification and chemical-segregation reduction leads to the decreased work function variations and the improved corrosion resistance. Thermodynamic calculations that are reliable to predict the phase transformations of the AlxCoCrFeNi HEAs, indicates a further enhancement in corrosion resistance through annealing could be guided for many other HEAs systems.
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