| Title |
Effect of Milling Time on Corrosion Behaviors of Spark Plasma Sintered FeCrMnNiCo High Entropy Alloys in 0.01 M HCl Aqueous Solution |
| Authors |
나세빈(Se-Bin Na) ; 이상화(Sang-Hwa Lee) ; 정재길(Jae-Gil Jung) ; 장희진(HeeJin Jang) |
| DOI |
https://doi.org/10.3365/KJMM.2026.64.6.493 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Corrosion; FeCrMnNiCo high entropy alloy; High-energy ball milling; Potentiodynamic polarization; Spark plasma sintering |
| Abstract |
The effect of ball milling time on the microstructure and corrosion behavior of the high-entropy
FeCrMnNiCo alloy was investigated in a 0.01 M HCl aqueous solution. Alloy powders were prepared by varying
the milling durations for 6, 12, 24, and 48 h, followed by spark plasma sintering at 1,000 °C and 80 MPa. Xray
diffraction analysis of the sintered specimens confirmed the presence of both FCC and Cr-rich phases in all
samples, with negligible phase variation observed as a function of milling time. SEM-EDS analysis revealed that
increasing the milling time led to a reduction in the size and Cr concentration of the Cr-rich secondary phases.
Conversely, the Cr content within the alloy matrix exhibited a corresponding increase. Potentiodynamic
polarization tests demonstrated that both the corrosion potential and pitting potential increased with longer
milling times. Pitting corrosion was generally observed to initiate at the phase boundaries between the Cr-rich
secondary phase and the matrix. The 6 h specimen exhibited the lowest resistance to pitting, which was
attributed to the significant Cr concentration gradient between the Cr-rich phase and the matrix, inducing a
local galvanic effect. Consequently, these findings suggest that the FeCrMnNiCo alloy can attain a stable
microstructure and superior corrosion resistance when subjected to milling for 12 h or longer. |