Journal
ENTROPY
Volume 20, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/e20120908
Keywords
(CoCrFeNi)(100-x)Mo-x alloys; high entropy alloy; microstructure; mechanical properties; corrosion behavior
Categories
Funding
- Fundamental Research Funds for the Central Universities [FRF-TP-16-044A1, FRF-GF-17-B18]
- National Natural Science Foundation of China [21703007]
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The present work investigates the influence of micro-alloyed Mo on the corrosion behavior of (CoCrFeNi)(100-x)Mo-x high-entropy alloys. All of the (CoCrFeNi)(100-x)Mo-x alloys exhibit a single face-centered cubic (FCC) solid solution. However, the (CoCrFeNi)(97)Mo-3 alloy exhibits an ordered sigma (sigma) phase enriched in Cr and Mo. With the increase of x (the Mo content) from 1 to 3, the hardness of the (CoCrFeNi)(100-x)Mo-x alloys increases from 124.8 to 133.6 Vickers hardness (HV), and the compressive yield strength increases from 113.6 MPa to 141.1 MPa, without fracture under about a 60% compressive strain. The potentiodynamic polarization curve in a 3.5% NaCl solution indicates that the addition of Mo has a beneficial effect on the corrosion resistance to some certain extent, opposed to the sigma phase. Furthermore, the alloys tend to form a passivation film in the 0.5 M H2SO4 solution in order to inhibit the progress of the corrosion reaction as the Mo content increases.
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